226 Answered Questions for the topic human biology

Human Biology Biology Physiology Metabolism

05/07/19

Is there any use of CO₂ in human body?
We all know CO₂ as a waste product of metabolism . Does CO₂ have any helpful role , apart from having a role in pH of blood ?
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Human Biology Microbiology Virology

05/07/19

Can viruses be toxic?
Bacteria can produce toxins like endotoxins and exotoxins. In diseases like cholera or tetanus they can harm infected people due to these toxins. Now, although viruses are much smaller and are... more
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Human Biology Microbiology Virus Virology

05/07/19

Can Biologists identify all viruses?
I went to the doctor today with my girlfriend, and the doctor said that she had a virus but doesn't know which one and she should let the infection heal with some rest. The fact that the doctor... more
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Human Biology Biology Microbiology Virus

05/07/19

Can Biologists identify all viruses?
I went to the doctor today with my girlfriend, and the doctor said that she had a virus but doesn't know which one and she should let the infection heal with some rest. The fact that the doctor... more
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05/07/19

How do antioxidants affect human metabolism?
I'd like to know how antioxidants affect human metabolism and which ones are essential for metabolic processes.
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05/06/19

Why is the microbial ecosystem of the gut so susceptible to disruption by pathogens?
From all accounts, it seems as if the Escherichia, Enterobacter, etc. that live and thrive in the human gut are pretty well entrenched. I know that these microbial populations are often analyzed as... more
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05/04/19

Why is the brain dependent on glucose?
The strict dependence of the (human) brain on glucose has always been puzzling to me. While ketones can substitute for a portion of the brain's energy needs, it cannot substitute completely: blood... more
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Human Biology Biology

05/02/19

Why do we like salt?
A few friends of mine told me that salt provides zero nutritional value to us, and in fact can harm our bodies. Now, these guys are medical students, and being an engineering student myself, I... more
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04/29/19

How heavy are all foreign microorganisms in and on the human body?
I define "foreign microorganism" as a microorganism which is not produced by the human body (not antibodies or leukocytes) including bacteria, viruses, fungi, biofilm aggregates or small lifeforms... more
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Human Biology Biology Medicine Cancer

04/29/19

Can/Have cancer cells be/been used in stem cell culture lines?
Since Cancer cells have unlimited growth potential, can they be induced towards totipotency and pluripotency? so, can cancer cells be used in stem cell culture because of similar properties of... more
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Human Biology Biology Hematology

04/29/19

Why do mammalian red blood cells lack a nucleus?
How did the red blood cell in humans get to lose its nucleus (and other organelles)? Does the bone marrow just not put the nucleus in, or is it stripped out at some stage in the construction of the... more
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Human Biology Microbiology

04/28/19

How much weight/volume do microbes occupy within the human body?
Microorganisms constitute the bulk of all the biomass on Earth. I weighed myself yesterday, and wondered how much less I would weigh if I were completely free of bacteria and microbes, inside and... more
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Human Biology Anatomy Physiology Cardiology

04/28/19

Can humans live without their right atrium?
The right atrium is one of four chambers (two atria and two ventricles) in the hearts of mammals (including humans) and archosaurs (which include birds and crocodilians). It receives deoxygenated... more
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Human Biology Genetics Gene Synthesis

04/28/19

Do I not have any alleles from my mom's mom & my dad's dad?
So, I have an XX, & I got an X from my mom, & an X from my dad. My dad would have gotten his only X from his mother, & my mother could have gotten the X I got from her father or mother.... more
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Human Biology Pharmacology Medicine Cancer

04/26/19

Does homeopathic or herbal treatment of cancer have any scientific recognition?
Even though we have a very high tech society, cancer is still a serious issue. We humans still are not entirely capable of fighting cancer. Radiation and chemotherapy are still considered the best... more
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04/26/19

How fast can a human run?
I'm a runner (cross country) and I'm always amazed at how fast Olympic sprinters are. There's a lot of hype about those in the 100-meter dash being the fastest in the world, and we're constantly... more
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04/23/19

If a human takes antibiotics are all bacteria in the body killed?
From my basic understanding, antibiotics kill living things, bacteria for example. Do the antibiotics consumed by a human-being distinguish between what they kill? Or do they just kill every... more
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04/20/19

Are humans the only animal that requires "clean water"?
I've seen a number of animals - dogs, cats, squirrels, ducks and geese, etc drink from puddles, some of them were muddy, others had green flora growing under water. Same goes for lakes and rivers.... more
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04/20/19

Death because of distilled water consumption?
One of my friends said that I would die if I drank distilled water (we were using it in a chemistry experiment) I gave it a go and surprisingly did not die.I did a bit of... more
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Human Biology Biology Measurement

04/19/19

What is the average speed of human sneeze?
I sneeze a lot, at various times and various "volumes", and often wonder about the speed of the sneeze itself, i.e. the speed of the air coming out of the nose while sneezing.What is the average... more
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04/19/19

How does aspirin "thin" blood?
As we all know, aspirin doesn't actually "thin" the blood, as it has been explained to me, it makes it "slippery". Slippery blood doesn't stick to itself hence this helps prevent internal blood... more
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04/18/19

Why do we have no enzyme to digest cellulose?
As we know, cellulose is the most abundant polysaccharide in nature. Why don't we have an enzyme to digest cellulose?
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04/16/19

What is the mechanism responsible for the periodicity of hiccups?
Hiccups ([*singultus*]) are caused by involuntary spasm of the intercostal muscles and diaphragm, producing a sudden inspiration with associated glottic closure. It seems the neurobiology of the... more
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04/16/19

Stretching and compressing bones?
The Young's modulus of elasticity when a bone is stretched is : 16*109 and when it is compressed, it is 9*109 N/m2. That means, change in length will be more if you compress a bone as compared to... more
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Human Biology Biology Physiology

04/16/19

Why do we get runny noses in the cold?
The most annoying thing for me about being cold is a runny nose. Is there an advantage to having a runny nose when cold? What does having a runny nose achieve?
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