The membrane potential that occurs when neurotransmitters bind to their receptors is called _______.
A) a postsynaptic potential
B) an action potential
C) an action potential and a receptor potential
D) a receptor potential
Ans: A) a postsynaptic potential
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Whenever people cry, their nose runs. This is because the ________ drain tears into the nose.
A. Wharton's ducts B. auditory tube C. nasolacrimal ducts D. lacrimal glands E. paranasal sinuses
The atrioventricular (AV) heart valves open and close ________
A) entirely differently from the mechanism used to operate the semilunar valves. B) as the circular muscles surrounding them operate C) passively, depending on the pressure of the blood in the atria and ventricles D) as papillary muscles and chordae tentinae pull them
Circumduction is limited to ball-and-socket joints.
Answer the following statement true (T) or false (F)
The most prevalent ions secreted by the tubules are:
a. sodium and chloride b. sodium and hydrogen c. sodium and potassium d. chloride and potassium e. hydrogen and potassium