Questions tagged [physiology]
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71 questions
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How does HCl reach the gastric lumen without killing the secreting cells?
Question 1 and Question 2 answer why HCl doesn't damage the stomach lining. The confusion is this:
The thick mucus coat is outside the parietal cells. The cell secretes H+ ions outside the cell ...
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how negative ion diffused through cell membrane toward positively charged gradient
on cell membrane, one of the factors that affect net diffusion rate is electrical potential between two sides. one of the physiology textbook shows what happen when at the same concentration, one side ...
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Why are there cervical and lumbar enlargements in spinal cord?
Two regions of the spinal cord are enlarged to accommodate the greater number of nerve cells and connections needed to process information related to the upper and lower limbs (see Figure 1.10B).
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Physiology of fetal haemoglobin
So HbF has lower binding with HbA which helps increase it's affinity for oxygen. The physiological reason being that it helps HbF to snatch oxygen from HbA.
However, fetal cells are extremely active ...
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How salt and sugar acts as substitute for Oral Rehydration Solution?
So we learned that sugar+salt solution works as a homemade remedy for diarrhoea just as good as commercial powders. In our region, it is more popular that commercial ORS(Oral Rehydration Solution)
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Why doesn't dissolved gas in blood come out of solution?
From "Ganongs Review of Medical Physiology" (26th Edition)
The partial pressure of a gas in a liquid is the pressure that, in the gaseous phase in equilibrium with the liquid, would produce ...
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Models and measurement techniques for work-related cognitive and physiological fatigue [closed]
I would like to know more about attempts at comprehensive models of work-related fatigue, or identifying strongly determining, measurable, correlating factors.
This includes both cognitive and ...
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how saturated fat increase lipoprotein number?
What is the physiological mechanism by which consuming high levels of saturated fat (but not unsaturated fats) causes higher lipoprotein numbers as measured by ApoB test?
The answer expected to refer ...
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Hypoxia effects on circulatory system
In the latest edition of Harrison’s Principles of Internal Medicine it is said that “acute hypoxia stimulates the chemoreceptor reflex arc to induce venoconstriction and systemic arterial vasodilation”...
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What does "partial pressure" mean in the setting of arterial CO₂?
I am currently learning renal physiology and was just introduced to the concept of partial arterial pressure of CO2, and I am a bit confused. I'll start with what I know and then move on to what I am ...
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What part of the auditory system restricts the human hearing frequency range?
It is well known that the human hearing frequency range is always between 20 Hz to 20 kHz.
My question is: what part of the auditory system does this restriction?
I studied the basics of auditory ...
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Does an increased heart rate from stimulants train the heart as if the increase came from exercise?
Bottom line it will probably be unhealthy - but if the effect on heart fitness is viewed in isolation?
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Should we invert other ECG leads if aVR was positive?
I would like to seek your kind guidance in understanding the right way of solving this question. (for the context, so far we only covered normal ECG and axis deviation)
The question displays all 12 ...
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How to determine QRS voltage from ECG?
Attached below is a question from my textbook "Guyton and Hall Textbook of Medical Physiology Review, 4e" and I am confused because the solutions manual has the answer as B (0.5mV), implying ...
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Do you know of any papers investigating the practice of "back cracking"?
I found a good number of studies investigating the effects and practice of "knuckle cracking", but close to none on other sites of joint cracking/popping.
knuckle cracking appears to be safe,...
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