Questions tagged [blood]

For questions about blood, its use in the circulatory system, its effect and what would happen if it was changed.

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4
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2answers
140 views

Is it possible for a blood type AB person to become type O temporarily?

I need a temporary mechanism for blood type switches for my modern love story, the protagonist is a werewolf and would transform every time when there is a full moon. I was thinking maybe a certain ...
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2answers
78 views

Why would a species from the Homo genus have overwhelmingly B negative blood type?

In my story (go to see What evolutionary pressures would lead to Ogres?), there is a massive species from the Homo genus called ogre. They mostly have B negative blood type (I do not mean Rhesus null, ...
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2answers
104 views

Using nanoparticles to give people blood clots for fun and profit

Some background: this question concerns iron oxide nanoparticles. Iron oxide nanoparticles are approximately 1 to 100 nanometers in diameter, as opposed to, say, a red blood cell, which is 10,000 ...
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2answers
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How do I stop blood from clotting except upon exposure to the atmosphere? [closed]

Blood clots in order to stop bleeding. The problem is that sometimes it clots when it's not supposed to. This is called thrombosis. It kills a shit-ton of people each year. I want this to stop ...
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3answers
1k views

Despite having serrated fangs, why doesn't the vampire make a mess during a feast?

The vampire loves fresh blood and often sneaks into houses at night to feast. It would wait for nightfall when the occupants were asleep and then force their fangs into the neck of it's victims. ...
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3answers
284 views

What is the largest size a creature using hemocyanin instead of hemoglobin could reach?

I haven't been able to find much on this question. I am making a world that is fairly cold compared to ours, not quite a snowball planet but enough that the highest average temperature is 66 degrees ...
3
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3answers
505 views

How can a vampire produce T cells at home?

Let's say that there's a vampire that consumes human blood for a regular re-infusion of T cells - both a convenient way to explain why they don't need massive amounts of it (you only need a few, and ...
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1answer
93 views

What would the effects of a muscle-wrapped mesh of a circulatory system be on a human?

Let's say that there is a biomodified human. Their circulatory system is something of a mesh; there are artificial connections between their blood vessels wherever physically possible, generally at ...
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3answers
209 views

How could a vampire acquire specifically human blood without killing anyone?

I've seen a similar question posted here, but my vampires require specifically human blood. Anything other than human blood or water is disgusting and indigestible to them. Some more notes: Drinking ...
2
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1answer
88 views

Could a chemical be used to carry oxygen in blood that would also turn acidic when in contact with iron?

So, the general idea is this: A humanoid species' blood uses a chemical to carry oxygen throughout their system. When iron is introduced into their bloodstream by say, stabbing them, it results in the ...
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1answer
95 views

Would it be biologically advantageous for a vampire that doesn't need that much blood to lick away skin in order to extract it, rather than bite?

Let's say that there's a vampire that doesn't need much blood per day - something like a teaspoon. Instead of deriving nutrition from it, they need it for its antibodies, so that their nonfunctional ...
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3answers
721 views

A reality check on blood viscosity decreasing under high temperature

Is blood that decreases in viscosity as it increases in temperature plausible? It's supposed to be a biomodification that decreases the amount of energy the heart needs to put in during strenuous ...
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2answers
228 views

Moving air with a heart?

Could an animal, instead of lungs, have an extra circulatory system that pumps air instead of blood? It seems plausible that it would work with water, as water seems similar enough to blood, but air, ...
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10answers
5k views

Why would vampires require human blood?

In my world, vampires need to consume a small quantity of human blood every month to survive. They usually supplement their diet with animal blood and human food. A vampire which goes without human ...
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5answers
4k views

What would happen if a refrigerated bag of human blood was warmed up in a normal kitchen microwave?

I have a vampiric character who feeds on human blood. She can do your normal plastic hospital blood bags or from the vein, but obviously blood needs to be refrigerated in order to stay fresh and cold ...
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1answer
330 views

What color would humans be if our blood wasn't red?

Humans, currently, are varying shades of orange and brown. Sometimes paler humans are more of a reddish color. But what color would a human be if our blood was blue, green, or any other non-red color? ...
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6answers
282 views

What are some ways I can ensure that only a small amount of people actively try to pursue divination in a pre-modern society?

I'm trying to make a story where the amount of people that are able to see the future range from 1-0.1% (i.e. 1 in 100 to 1 in 1000). The problem I'm having is that I'm trying to have my cake and eat ...
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3answers
260 views

Is bi-metallic blood possible to develop organically in a species?

I've looked up the different "Colorations" of blood online, different metal-based proteins have differing levels of oxygen transfer efficiency, but those were answers I didn't find ...
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2answers
251 views

Biological Antifreeze In Blood

Okay, so I have a sapient alien species that has a carbon-based biochemistry, and is extremophilic, able to survive having their internal temperature lowered to as cold as 253 K. They are able to do ...
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3answers
590 views

How long would it take for inbreeding issues to arise for a family that practiced inbreeding?

The magic in my setting arises from inbreeding. However to gain the powers a person must be in-bred. How long would it take before such problems arise from inbreeding if the people continued this ...
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1answer
59 views

How do you transfer a blood curse? [closed]

The curse is made into a tea using the ashes of war, the blood of fallen soldiers, and the tears of their widows and then given to the victim to drink. Since the curse is in the victim's body and made ...
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8answers
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How can a 15-year-old vampire get human blood?

Since they can't really work a job that would allow easy access to blood, I thought of having them volunteer at a blood bank then maybe steal a bag. Alternatively, is it plausible that they would come ...
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2answers
147 views

How would certain blood types be more susceptible to "blood bending" than others?

There exist abilities that are specifically tuned to certain individuals or clans. One of these strange abilities is known as blood-bending, which is the power to turn an individual's blood against ...
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3answers
269 views

Infectious hemophilia

I want to know if the disease I invented is realistic or a total fiction. Coagulopathies or bleeding disorders, like hemophilia, and Von Willebrand's syndrome, are diseases in which the blood's ...
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4answers
7k views

Would a vampire still be able to be a practicing Muslim?

I had debated whether asking this but given the very good answers on this question I thought it would be worth a shot. I have a character in my story who is a vampire and a practicing Muslim. ...
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9answers
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If a scientist were to compare the blood of a human and a vampire, what would be the difference (if any)?

I tried to stick with vampire folklore and the various movies/shows about vampires when I thought of how vampires would be like if they really existed, but I also wanted to keep it as realistic as ...
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1answer
214 views

What would bloodstains look like after 500 years?

I realise this is a bit of a strange question, but what would bloodstains look like after ~500 years? Specifically, what would a text written on parchment using (human) blood as ink look like after ...
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1answer
493 views

What would 500 year old dried blood look like?

Imagine you are in a mountain cave (in the mountain, or under the earth), and you stumble upon a what seems to be a lake of blood. It's roughly 4mx4m (13ft) wide and 2m (6.5ft) deep. The blood is ...
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7answers
6k views

Can blood form snowflakes?

In a (marginally) cursed world rains of blood are an occasional occurrence. The water in the clouds is magically transmuted into blood at the point it starts to coalesce into droplets (no need to ...
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1answer
266 views

What blood pigment type is immune to ammonia poisoning?

I am designing a world in which the biological solvent is an ammonia-water mixture and need help finding out which blood pigments (Hemoglobin, Hemocyanin etc.) would be immune to the negative effects ...
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5answers
9k views

What colour would our blood be if our blood was based on gold? [closed]

Humans have blood based on iron, thus our blood is red. Some aquatic life has copper based blood, thus their blood is blue. If we were gold based, what colour would our blood be, and why? What would ...
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4answers
291 views

How do male vampire loses iron?

In my universe the vampire race all had pale skin due to low iron presence in blood and thus they had to constantly keep a certain level by feeding on human, the female vampire can lose a lot of iron ...
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2answers
292 views

Could a blade rusted by dried blood become jammed in its sheath?

My character forgot to clean his sword after killing a man. The blade stayed for weeks in her sheath, drying the blood. I wrote a scene where he can't unsheathe his sword because it's "jammed&...
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1answer
252 views

Bio "blood magic" how would it work in science fantasy [closed]

I'm putting together a story that centers around "blood magic" and ancient civilization that uses some "rare crystals" as infinite source of Energy. the blood magic comes in gas form [from any source ...
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3answers
615 views

Do dead human bodies have a particular smell?

I'm working on a story where there is a crime scene where the protagonist (who has a superhuman sense of smell) notices a scent that smells like human corpses due to their abilities. I'm wondering how ...
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1answer
103 views

Colors of cobaltodihistidine [closed]

I have heard the complex, Cobaltodihistidine, (not coboglobin) mentioned several times on this site in relation to alternative oxygen carriers, and I believe that this complex could be what my species ...
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1answer
83 views

How would blood types and blood transfusions work in a setting with widely different humanoid races? [closed]

This is something I think is almost always overlooked in science fiction settings. Do different races have completely different blood types from those of say humans? Could a Klingon from Star Trek ...
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1answer
110 views

Why would spell circles written in blood which contain iron be more powerful than using gold or silver ink? [closed]

Set in the 13th century A. D. the search for Philosopher's stone which is said to allow user to transmute base metal into gold or perhaps even diamonds as some have claimed. Since then people starts ...
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2answers
314 views

Would cold-blooded dragon be suitable for flying?

I am designing a cold-blooded dragon about the size of a house cat with a wingspan of 3 metres from tip to tip. It will climb on top of rocks at noon when there is ample sunlight overhead. I need it ...
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15answers
11k views

Where could a vampire get blood without harming people?

I am looking for possible ways in which a vampire could obtain blood to feed in an modern urban fantasy setting explicitly without harming humans or other sapient beings. Parameters for this question ...
2
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1answer
139 views

How to prevent vampires from catching bloodborne diseases? [duplicate]

Vampires are known to be humanoid creatures to whom the nutrients in blood are essential. I will assume that, for the purpose of this question, vampires are entirely human but consume blood, may it ...
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2answers
177 views

Could a blood transfusion from immune survivors of a deadly, bioengineered virus grant the same immunity to those who don't have it?

First question so hope I'm doing this right! Working on a setting right now where a bio-engineered virus/plague is wiping out a large portion of humanity. Most died upon first exposure. Some survived, ...
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1answer
307 views

What kind of metal-based blood types be effective/used in transporting non-oxygen gases and what would their color be?

There's iridium-based blood called Chloro-carbonyl-bis(triphenylphosphine)-iridium that's effective at transporting hydrogen alongside oxygen. What I want to know is that, are there other metal-based ...
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2answers
521 views

Would it be possible for my fantasy creature to have black blood?

A friend of mine has a race of creatures in her headworld and has been wondering about a biological answer to justify the color of her race's blood even though magic is a bit sprinkled in there. One ...
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3answers
534 views

Blood for hydrogen breathers

Some follow-up thoughts on this question... Hydrogen isn't very soluble in water. Oxygen is more so, but still sufficiently insoluble that most oxygen-breathing Earth creatures use special oxygen ...
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2answers
255 views

Can ice magic freeze blood?

In my story, one of my main characters has ice powers. She can turn water into ice, she can conjure ice (sucking moisture out of air and freezing it). She can also drop someone's body temperature, as ...
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3answers
1k views

What would humans look like if their blood were silver?

I have a species in mind that I want to write about for a book I'm planning, and they look exactly like humans (minus the 'unnatural' hair and eye colors they can posses). However, they have silver ...
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7answers
5k views

Blood-based alcohol for vampires?

So a setting I had in mind has vampires, of the rather traditional kind. They aren't as inhumanly strong or fast, but in turn they aren't instantly incinerated by sunlight, instead just being really ...
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8answers
6k views

What could a Medieval society do with excess animal blood?

In my fantasy project I have a vaguely medieval society (specifically the high period). However some of their religious practices are more along the lines of a iron age society. One of the biggest ...
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3answers
819 views

Is acid blood possible?

I'm designing an alien species, whose blood is highly acidic and can easily cause someone's hand to melt down. It's pretty similar to the Xenomorphs from Ridley Scott's Alien, except for the color ...