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Questions tagged [human-biology]

This tag is for questions about the general biological features of human beings (as opposed to the biology of non-humans).

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4
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1answer
118 views

Can the heart generate its own rhythm independent to the SAN?

My textbook and a revision guide, which I believe is a reinterpretation of the textbook, state that: The SAN initiates waves of excitation that usually override the myogenic action of the cardiac ...
0
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1answer
233 views

What are the brain structures directly on top of the brain stem?

I have been trying to learn the anatomy of the brain, and some information on their functions, through an iPad app called 3D Brain. Whilst going through the different parts, I have noticed that one ...
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0answers
22 views

What is the name of the wrinkles occurring in people's lips? [closed]

I was wondering if there is a name for the wrinkles occurring in people's lips. Just curious.
1
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1answer
65 views

Would our body adapt to changes that are not in our DNA?

If a person was to undergo a treatment or surgery at a very young age, that significantly reduced their final height, would the rest of their body adjust to the sudden change? If not; because our arms’...
0
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1answer
54 views

Where does the energy required to turn ADP into ATP come from? [closed]

My teacher states that in order to convert ADP into ATP, energy from respiration is required. However, I watched a video which states that energy from the son is used to turn ADP into ATP. Which is ...
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0answers
48 views

What is the role of plasminogen used in the preparation of APSAC? (Anisoylated Plasminogen Streptokinase Activator Complex)

What is the role of plasminogen in APSAC, and how is there indirect activation of plasmin through APSAC? Reference https://www.sciencedirect.com/topics/chemistry/fibrinolytic-agent
2
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3answers
178 views

Is reverse senescence/“anti-aging” actually scientifically possible among humans yet?

I have been very interested in this since I myself am interested in reversing my skin's aging/genes/damage/etc. I also am interested in volunteering any future genetic altering of skin quality. ...
1
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0answers
34 views

Is there a chemical compound, element or something else that could color the eye lens in purple?

I hope this is a right place to ask this question. I'm writing scifi book, and looking for information whether it is possible for any element, chemical compound, radiation or something else to color ...
1
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2answers
150 views

Are spinal nerves myelinated and unmyelinated at the same time?

I was trying to answer this question when I remembered that the somatic axon is myelinated, while both sympathetic and parasympathetic preganglionic axons are also myelinated. Are they only myelinated ...
1
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1answer
175 views

Lobed Nuclei still count as One nucleus?

Do the Lobed Nuclei of immune cells (such as Megakaryocytes) still count as one nucleus?
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0answers
7 views

Colour of Vein surface(tunica externa)

If vein from hand is isolated out and blood from within flushed then what will be the colour of vein surface.
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0answers
82 views

What are the (statistically) normal pH levels in the most-outer part of human sexual organs?

What are the (statistically) normal pH values of the outer skin/epidermis of human sex organs (groin/crotch) in the male and female? e.g male testes, female vulva, male glans, the enveloping epiderm, ...
5
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2answers
2k views

Does human brain produce nicotine?

I had a discussion with a high school student about the effect and production of nicotine. He mentioned that nicotine is naturally produced in our brain so when the person takes to smoking, the brain ...
2
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1answer
31 views

Effect of the same caloric intake of different macronutrients on body weight

To gain weight, caloric intake > caloric expenditure. To lose weight, caloric intake < caloric expenditure. But what is the effect of the type of macronutrient ? That is to say : does the same ...
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0answers
15 views

Autophagy role in mortality and mental health

These days the "fasting industry", personal trainers and self proclaimed doctors on youtube make strong claims such as fasting lengthening life and improve mental health or prevent alzheimer's disease....
2
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0answers
38 views

Archenteron vs Gastrocoele

What is Difference between “Archenteron” and “Gastrocoele”. Are they same or different? Gastrula is characterized by Archenteron or Gastrocoele or Both?
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0answers
24 views

Problems with plexus, ganglions

I don't know exactly what a plexus is. I have a book where is written that a plexus is an intramural ganglion. Could you please tell me what is a plexus? (Vegetative plexus)
4
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0answers
151 views

Why can humans tolerate eating onions but other mammals like dogs and cats cannot?

Onions are one of the many foods we shouldn't feed our pets. Looking it up, I learned that onions cause hemolytic anemia in MANY species: cattle, sheep, horses, dogs, cats, and even some primates. If ...
1
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1answer
94 views

Surviving only on another's exhales?

While reading this - Surviving under water in air bubble - this question came to me: How long can an adult person survive on breathing in only exhales of another adult person? Can this be even ...
2
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1answer
46 views

How does a decrease in free Ca2+ result in nerve/muscle overexcitability?

I have in my notes that a decrease in free Ca2+ increases membrane permeability to Na+ so that it is brought closer to threshold, but no further details. So how does this work?
6
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1answer
259 views

Why do obese people heal more slowly?

I recall an obese patient who was referred to a transplant clinic as his stitch wounds hadn't healed after a year. While there's a myriad of side effects caused by immunosuppressive medication after ...
0
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1answer
122 views

How are fingerprints formed?

I know what influences the fingerprints to be unique always. But what actually process is taken to make these as we grow?
0
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1answer
528 views

Does the renal vein have a greater glucose concentration than the renal artery?

My IGCSE markscheme says that the renal vein has a lower concentration of glucose? I would expect the renal artery to have lower glucose concentration as water is lost from the kidneys. Why is it so?
1
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1answer
104 views

What does common viruses found in the body weigh?

On NPR public radio news it was said that if the bacteria that is natural that assist in body function or just present in your body was put it into a ball it would weigh more or less 7 ounces (...
0
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0answers
66 views

Is there any evidence that Vitamin K-2 megadoses increase bicondylar, bizygomatic or bitemporal breadth in humans?

Can megadosing or supraphysiological dosing of Vitamin K2 (MK4; Menatetrenone) over prolonged periods of time cause an adult's bicondylar breadth, bizygomatic breadth or bitemporal breadth to grow ...
3
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2answers
136 views

Does the brain have a clock and can it be sped up?

Before i start, I'm an engineer and have very limited knowledge on biology and neuroscience. My question is, does the brain have a clock like a computer where it has a set processing speed? Clocks in ...
1
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0answers
17 views

do platelets cytoplasm contains DNA?

I'm a 12th-grade student and I have an entrance exam this year. I have a question in biology. I would appreciate you if you help me <3 as we thoroughly know platelets are multiple pieces of a big ...
1
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1answer
181 views

Why is there a layer of moist lining the inner walls of alveoli?

I'm taught that the walls of the alveoli are moist, so gaseous oxygen molecules can dissolve into this water. This then allows the dissolved oxygen (liquid state) to diffuse faster from the alveoli ...
0
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2answers
51 views

Does low gravity exposure to early stages of human fetus have potential to unloc unused genetic information from earlier stages of evolution?

The title seems quite self explanatory but let me elaborate. New mutations do take a very long time and many generations to occure in the genetic code. But our genetic code already holds all the ...
0
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0answers
55 views

Colour of our organs

Upon researching the organs of the body I have found that in every picture that I have seen the organs are of colour for example the kidneys are a light red colour. I understnad that our organs are ...
0
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0answers
58 views

What are the proportions of average human arms, legs and torso to each other that the population tends towards?

Normally when I draw or model something, I have a reference image. However, I want to draft a human-like creature for which there is no reference image, so I have to build it from scratch. For some ...
3
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1answer
379 views

Why does sympathetic activity constrict pulmonary vessels?

I don't know understand why sympathetic stimulation constricts pulmonary vessels? I thought that the sympathetic nervous system activated the body for physical activity. Physical activity would need ...
0
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0answers
14 views

What does ubiquitination between 2 genes mean?

I have come across the Hedgehog signaling pathway. In this pathway, the genes Cul3 and ptc have an interaction of ubiquitination (The information is available from the KGML file). What does this ...
0
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0answers
10 views

Histology cheek swab

I recently did a cheek swab and I can recognize the cells the nucleus and cell membrane, but I noticed a section that had a cluster of nuclei resembling dots. I was wondering if it was just cells ...
0
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1answer
51 views

Is the lac operon repressed in the presence of both glucose and lactose?

In the presence of both sugars (glucose and lactose) will there be repression of the lac operon completely? I know that more glucose means less cAMP --> less CAP --> less positive regulation, and ...
5
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1answer
65 views

Do fat people have more chances of developing nitrogen bends?

I was reading some text on deep sea physiology. I got to know that solubility of nitrogen in fat is five times that in water. The exact text from the book animal physiology adaptation and environment ...
6
votes
1answer
209 views

How can a child be blood type AB, if both of the parents are blood type A?

Basically, both of my parents are blood type A (both are confirmed and it's also certain both of them are my biological parents). I recently found out my blood type is AB. How is this possible? I ...
0
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0answers
17 views

What is the max amount of photons per second of the rods and cones in our eyes?

The title says it all. I just cannot find any information about this - I have tried for so long now. Therefore, I figured that I could reach out to some clever guys in this forum for help instead:) ...
2
votes
1answer
108 views

What are the effects of oxygen toxicity in human blood?

I was reading some text on deep sea Physiology, and for to know that diving to do could cause oxygen toxicity in the blood. This was the exact text from the book Textbook of Medical Physiology by ...
1
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2answers
93 views

How does common cold START?

When I searched for the causes of common cold, I found out that it's only cause is the spreading of virus and that it's a myth that you get cold when you get wet. If that is true then how does the ...
0
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1answer
47 views

Can endemic diseases be acute?

Diseases can be classified as :endemic ,or pandemic,...etc. An endemic disease is an infectious disease which is generally or constantly found among people in a particular area. Disease conditions ...
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0answers
21 views

Do all commercial ionizers produce harmful ozone?

I'm not a scientist. I have read that negative ions have health benefits. I am interested in increasing the ratio of negative to positive ions in the air in my home. I see that ionizer machines exist ...
1
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1answer
148 views

We know that the hepatitis C virus can live on surfaces for at least six weeks. Maybe longer. The infectivity study ended after just six weeks; why?

Background A paper has found that the hepatitis C virus (HCV) can remain infective for at least six weeks on ordinary household surfaces. You can see the free full text, or a summary for busy ...
0
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1answer
29 views

A study found that the hepatitis C virus can live on surfaces for six weeks. Did they end the study before the seventh week began?

A study once found that the hepatitis C virus (HCV) can remain infective for six weeks on ordinary household surfaces. You can see the free full text, or a summary for busy clinicians. What happened ...
1
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1answer
19 views

Why proximal muscle weakness is seen earlier than distal muscle weakness in Dermatomyositis?

It is said that in dermatomyositis(DM) , proximal muscle weakness is seen earlier than distal muscle weakness. It is also said that , DM is due to damage to small blood vessels contributing to muscle ...
-1
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2answers
89 views

Effects of horizontal vs. vertical motion on human body

I want to know if moving along a vertical plane in a circle differs in its effects on the human body from moving horizontally in a circle. Imagine a ferris wheel with a diameter of 50 metres. If a ...
0
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1answer
32 views

Height prediction based on genetics

My height, as predicted by my genetics, is 156 cm whereas my actual height is 172 cm. What could be the reasons for this substantial discrepancy? Does it just mean I had very good nutrition as a child?...
3
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1answer
109 views

Osmotic Pressure Clarification

My textbook states that the higher concentration of solutes, the greater the osmotic pressure will be and the greater the pull of water in will be. However, osmotic pressure is defined "as the ...
1
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1answer
50 views

When muscles contract is the process similar to how non-newtonian fluids react?

I'm trying to understand how muscles contraction/tension works but getting loss in on the cellular level. From my understanding, when muscle tissue need to contract, the cells are flooded with calcium?...