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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10
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2answers
714 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
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2answers
207 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 ...
25
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16answers
17k 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 ...
4
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1answer
314 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
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2answers
548 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
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3answers
404 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
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1answer
230 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 ...
6
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2answers
704 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
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10answers
7k 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 ...
3
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1answer
207 views

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

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 ...
9
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4answers
3k 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
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3answers
2k 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
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2answers
305 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
792 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
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2answers
1k 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 ...
48
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4answers
8k 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
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1answer
469 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
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3answers
848 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
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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
171 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 ...
15
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5answers
3k 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 ...
22
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7answers
7k 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 ...
56
votes
6answers
15k 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
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3answers
324 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
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1answer
482 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 ...
19
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7answers
11k 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 ...
42
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5answers
5k views

Could a humanesque creature derive all its nutrients from drinking blood?

Vampires are a very common creature in various fantasy stories, they drink blood and often human food poisons them. Forgetting for the time being the additional rumours/fiction such as sunlight, ...

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