The capacity of a muscle to respond to an electrical stimulus is ______.
a. elasticity
b. contractility
c. excitability
d. extensibility
Ans: c. excitability
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Which of the following is the most significant source of blood flow resistance?
A) blood viscosity B) blood vessel diameter C) total blood vessel length D) blood vessels type
Which artery/arteries branch(es) is/are most proximal to the beginning of the aorta at the heart?
A) coronary B) hepatic C) carotid D) pulmonary E) renal
What causes the heart valves to open and close?
a. action potentials in vagus nerve b. electrical connection with vagus nerve c. differences in blood pressure across the valve
Proteins in the cell membrane that bind hormones and relay messages into the interior of the cell __________.
A)are known as carrier proteins B)are known as channel proteins C)perform a function known as signal transduction D)provide cell identification