Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [blood]

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

13
votes
8answers
2k views

Would it be possible for mammals to evolve blue blood?

Ever since I found out about the green blooded skink, I have wondered if it's possible for other blood colours to evolve among vertebrates, specifically blue in mammals.
26
votes
7answers
11k views

How can a person be kept alive while being periodically drained of blood?

I have invented a large machine that allows me to create monsters out of blood. These monsters are called golems and are very powerful. My plan is to produce a large number of them to include in my ...
0
votes
0answers
60 views

What color would human blood be, with no iron in it? [duplicate]

There have been a few other questions similar to this, but I'm not talking about, say, copper-based blood being green or anything. I'm merely wondering about human blood, if it had no iron. And were ...
11
votes
2answers
2k views

Human Blood Reactivity on an Alien Species' Skin

What would be a valid reason for human blood/sweat/body fluids being toxic/harmful/caustic to an alien species' skin? What would the aliens' organic biochemistry be like and what would their DNA be ...
5
votes
2answers
159 views

Which hydrogen halide to have in blood to replace water?

So I want to have an alien creature on a planet with a halogen atmosphere. It will have to be at a temperature where the hydrogen halide is liquid or solid. This hydrogen halide I would have as the ...
6
votes
4answers
282 views

Can telekinesis be used to stop someone from bleeding to death?

So let's say someone has telekinetic powers. He can move a bunch of things at once with his mind as long as the objects aren't too heavy. One day he's walking through a dark secluded alleyway and, oh ...
10
votes
5answers
1k views

Alternative elements for oxygen transport in an alien blood

I am designing an alien civilization for a story, and I am currently in the biological part. They will be oxygen breathers, so they will need to have that oxygen delivered inside their bodies, and I ...
2
votes
1answer
131 views

What cost to creating vampires [closed]

Assume a world in which vampirism is totally unlike how it is usually portrayed in Bram Stoker's Dracula, Anne Rice novels, True Blood etc. Instead it's somewhat analogous to a disease where the ...
26
votes
5answers
5k views

How reflective is blood?

If you were on a raft in say, an ocean of blood, and it was very still, would you be able to see the stars of the night sky reflected in it? Would you be able to see your own reflection? How far down ...
0
votes
1answer
122 views

What would the pros and cons of self propelled blood be (by any process) [closed]

Self propelled blood has been used many time in fiction to explain why rival characters cannot be killed. An example would be a manga named The Throne of Super Man (Choujin Sensen). In the manga ...
2
votes
2answers
180 views

Blood magic in a science fantasy? [closed]

I'm putting together a story that centers around a unified galactic government, but I hit a small snag. Blood magic would be the only "supernatural" aspect of the story, and it would be illegal to ...
9
votes
5answers
334 views

Radiation shielding in the blood?

I wanted a creature that produces something in its blood to protect itself from SEP (solar energetic particles) and GCR (galactic cosmic rays). The skin of the creature is normally sufficient ...
11
votes
4answers
425 views

Could a decreased heartrate thanks to better hemoglobin lead to an increased lifespan?

When looking at mammals and their heart rates one can find a correlation between the lifespan of a mammal and their heart rate. Namely most mammals seem to get about 1 billion (the American one) of ...
3
votes
3answers
429 views

Blood Transfusion in the Middle Ages

It is the typical Middle Ages. Simple bow and sword wielding peasants. They have basic medical skills, can stitch wounds, amputate, etc. In this age, will it be possible to do a blood transfusion? If ...
12
votes
2answers
2k views

How would black blood change a human's appearance?

Say they had pale skin, what would they look like? Would the lips be black? Would the vascular system show through the skin more? I'm not very interested in how or why their blood is black, just how ...
1
vote
2answers
465 views

What would women do about periods in a medieval fantasy setting? [closed]

CN: blood. (I also don't want to upset people with gruesome descriptions - answers that stick to the clinical side of things would be appreciated.) In a medieval fantasy setting, what would women do ...
0
votes
3answers
78 views

Is it possible to extract all nutrients from human via blood? [closed]

You want to extract all nutrients from other human. You build some sort of machinery that processes blood, taking most of nutritions - fats, proteins, carbohydrates etc. and some blood, so nutrients ...
3
votes
3answers
450 views

How do I make a new and interesting type of “Zombie” creature?

CODE DRIVER In my story, I want to have a world in the middle of a zombie apocalypse, but I also want it to feel different from any other interpretation out there. I call my monsters "Odd People" or "...
15
votes
2answers
798 views

How far can blood spray?

A creature has evolved to protect the herd. Its blood contains chemicals that act like pepper spray, burning the eyes and throat of anything around it. However it wants to be able to get a decent ...
2
votes
3answers
131 views

Increased blood pressure reasonable?

My Kepler Bb humanoids have their arteries and veins doubled up(quadrupled if you are looking at the coronary arteries and veins). This makes sense because they have 2 hearts and both of those are 4 ...
28
votes
6answers
3k views

How well could a dog pick out the scent of a single person in a pool of carnage?

I'm writing about a world that predates most modern forensic techniques, and I am looking for some old-fashioned methods of sleuthing that would have been available at around the 1850-1900. In one ...
11
votes
9answers
3k views

Robots with (specifically red) blood

So I want robot enemies in my series, but I also want gore without killing living creatures (related to this, because the opponent is the same, the gr8 computer) So basically the robots I talking ...
3
votes
4answers
215 views

Is blood pressure a good restriction?

I'm researching who to let onto my generational ships. I have figured that certain pre-existig inheritable medical conditions should be screened out of who makes the cut or not, focusing on ...
-2
votes
2answers
141 views

Is it much easier to make entire human population to have blood type O than type AB? [closed]

Not all human blood are equal thanks to the antigens that prefer to strap themselves onto surfaces of cells. They are like a signal flare to inform soldiers whether target is friendly or not, most of ...
10
votes
2answers
401 views

Coboglobin clarification

I've been working on an alien species, and I wanted it to have a blood colour other than red. I was going to go with Coboglobin until I found the sites I was looking at providing diametrically ...
0
votes
2answers
133 views

Polycythemia good underground?

Polycythemia is where the hematocrit is above 55%. This can be divided into absolute and relative and absolute can be further divided into primary and secondary. Absolute polycythemia is where the ...
24
votes
16answers
11k views

Why can vampires only drink human blood? [closed]

Vampires are depicted differently in every work of fiction, but one thing mainly stays the same: they need blood to survive. Human blood, to be precise. Some stories add in the rule that they can also ...
5
votes
1answer
207 views

Most effective environment for coboglobin

So after reading over other blood colors and the benefits of other blood bases I wanted to create a species that used Coboglobin instead of Hemoglobin. Though based off of Jim2B presented of, On this ...
7
votes
2answers
401 views

Cyanoglobin plausible?

I have done research on blood and in particular the component adding color and transferring oxygen. Hemocyanin is directly dissolved into the blood. This works for an octopus, but not a reptilian ...
2
votes
3answers
282 views

Can slowing down someone's heart help them survive a stab wound? [closed]

Okay, in my story a character can use magic. Their friend has been stabbed in the chest. Could magically slowing down their heart or body help save them?
7
votes
1answer
206 views

What is the botanic equivalent to the circulatory system?

There have been a few questions on mobile plants on this site and even more on their intelligence, but one that has not been asked so far is related to the lifeblood of creatures: blood. Inside of ...
5
votes
2answers
562 views

Would it be possible to bleed if your blood pressure would be less than atmospheric pressure

If your blood pressure ever falls below the ambient atmospheric pressure would it be possible for you to bleed. Because if blood pressure was less than that of atmosphere air would move in if you get ...
34
votes
10answers
6k views

How long after death is blood fit for consumption?

We all know that food spoils if left untreated by some form of preservation. Different foods spoil at different rates, of course. Let's say Dracula stumbles across a fresh corpse. (For the sake of ...
2
votes
1answer
154 views

How does blood colour, blood base and the gas a creature breathes interact with each other?

For example: humans have red, iron-based blood, and breathe oxygen, like most mammals. Would a creature with silver-based blood have black blood? What gas would they breathe and why? To summarize, how ...
8
votes
3answers
2k views

Golden blood of the Gods, How does it work biologically?

In movies, novels, fictions and mythologies, it is quite often told/seen/heard that the blood of the gods are that of gold. I want to know how does gold colored blood works in biology, what are its ...
5
votes
3answers
827 views

How can I preseve a small sample of blood for centuries?

I have a race of carnivorous mammals (the same from this question) for whom blood plays an extremely important role in cultural rituals. For complex cultural reasons, a member of this race (call him ...
3
votes
2answers
265 views

Vampiric Blood River

We've all heard about a river of blood. But what would happen if we had an actual river of blood? Say a band of vampires creates a magical portal that draws blood from all the people in the area and ...
4
votes
4answers
763 views

A child of two different blood bases?

If two different species with different blood bases, say iron and copper, had a child together, how would that affect their child? Which blood base would the child inherit? Could they even have a ...
12
votes
2answers
656 views

The benefits of alternate blood bases?

So, according to Other blood colors it is entirely possible for other blood colours to evolve based on what base they use, but why? What would be the benefits of these different bases? What purpose ...
47
votes
4answers
7k views

How many nanobots can I have in my blood?

In a world of cyborgs, it seems pretty likely that many people will have some number of nanobots in their blood, completing tasks such as clearing away blockages, monitoring health, and boosting the ...
1
vote
1answer
370 views

Can a human survive getting back stripped down blood?

Could a humanesque creature derive all its nutrients from drinking blood? One of the linked question's answers talks about the vampire becoming a filtration system from humans, could the vampire ...
4
votes
3answers
657 views

Which is better for vampires: fresh blood or frozen?

Could a humanesque creature derive all its nutrients from drinking blood? Would a vampire get more energy, warmth or nutrients from fresh blood as opposed to frozen? What about fresh blood vs. old ...
5
votes
1answer
1k views

Would different types of blood (AB-, O+…) have different nutrients for vampires?

How much blood does a vampire need? Could a humanesque creature derive all its nutrients from drinking blood? Both these questions have some good answers and my question is based off them both... ...
2
votes
1answer
146 views

could different bloods of the same metal type mix?

Other blood colors The link about talks about other color's of blood that could be if made with either different metals or different oxygen carrier's. What I want to know is if you mixed iron blood ...
14
votes
5answers
2k views

What metal or compounds will make blood silver?

I have a race of people who have silver blood. Thing is, I'm really trying to keep it as realistic as possible despite this being a fantasy world. The blood has raw magic energy in it as well, but ...
14
votes
5answers
4k views

What can I do to make blood black?

In my world I find it simplest to have iron-based blood. The problem is that iron-based blood is red, and I want it to be black. Two things come to mind; one is making the blood denser, resulting in ...
50
votes
5answers
10k views

Other blood colors

Many people know that our blood is red because it is iron based. Many people also know that blood is blue or green if it is copper based. I'm wondering what color blood would be if it was let's say ...
4
votes
3answers
301 views

Human Blood as tradable nutrition in post-apocalyptic setting?

I hope that this question qualifies for worldbuilding. Take my apologies if it's too specific / not specific enough. In a post-apocalyptic desert-like environment with only a few million people left ...
6
votes
1answer
389 views

Is the vibrancy of the color of blood visibly affected by blood cell content?

Part of this story I'm writing involves a human subspecies who are adapted to extremely high altitudes -- as high or higher than our real world's Tibetan population, let's say. I've done research that ...
18
votes
7answers
9k views

How much blood does a vampire need?

Assuming that a vampire expends as much energy as a human of similar size how much blood would they need to consume a day? My naive estimate is 2500 calories a day, there are (apparently) about 9 ...