282 Answered Questions for the topic physiology
What's the mechanism for being mentally tired?
I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there... more
Why is the combined secretion of glucagon, epinephrine, and Cortisol effective in raising blood glucose level?
In temporomandibular joint dysfunction (syndrome), one muscle attaching to the capsule and articular disc becomes tensed and painful. What muscle is this?
Is stereo olfactory ability restricted to humans?
Most animals I see around seem to have two nostrils - humans, snakes, birds, fish .. and so on. From reading online I see that 2 nostrils provide a stereo olfactory effect. This stereo effect is... more
How do eyelids blink, given that muscles only pull, and never push? Where are the muscles that cause blinking?
How does a pine cone open?
When a pine cone is wet, it remains closed. However, when it's dry it opens again. From the perspective of physics or biomechanics, what is the mechanism that allows a pine cone to open and close... more
Which valve connects the aorta to the heart?
Why does gas exchange occur?
The process in which antibodies attach to antigens, causing the formation of masses of linked cells, is called ________.
Why do our bodies maintain blood pressure but not the flow rate?
This might be a silly question but i'm not not clear I'm always told that blood pressure is homeostatic parameter and can't not be changed but isn't what important is the flow rate to the organs?... more
Gastritis on Endoscopy
A patient undergoes a gastroscopy and it reveals atrophy in the gastric mucosa in the body and fundus. This patient has an increased risk of developing which of the following? Pernicious... more
What processes are going on in the body to cause depression symptoms such as aversion to even moving, and poor focus/memory?
Can anyone explain how contraction of the ciliary muscles causes relaxation of the zonules? Please explain it anatomically i.e. the attachments of ciliary muscles and its relation with the... more
Tonicity of RBCs including hemolysis and crenation
Hello - please help me with the following questions and provide a brief explanation if you can :) Question 1 (True or false) a) When a RBCs are placed in a solution of 100 mOsmol/l NaCL, crenation... more
A section of the lung that receives its own tertiary bronchus is called the ________.
Does your metabolism slow down when you lose weight?
How can I increase my metabolism without exercise?
Common english name for tissues which are separated from the blood by blood-tissue barriers?
Which general term is used to denote such organs/tissues as: brain, testis, thymus etc., which are separated from the blood by blood-tissue barriers?
Bones are connected to bones by _______________, while muscles are connected to bones by ______________.
What brain areas are involved in language processing?
Could a high TSH level mean a problem with the pituitary gland?
When our physician suspects we might have a problem with our thyroid he sends us to check the TSH level in our blood. If there is a lot of TSH in the blood it means that the thyroid can't work... more
What is the role of gills in terrestrial Crustaceans?
Why do *Crustaceans* that live on land have maintained their gills? In aquatic species, the gills play a pivotal role in respiration, but terrestrial crustaceans have tracheal lungs. So why do they... more