Substance A is found to be a competitor with acetylcholine. Which step of muscle contraction physiology would be directly affected by this substance?
A. Release of acetylcholine from the presynaptic terminal
B. Exposure of the active sites on G actin
C. Release of the myosin head following the power stroke
D. Generation of an action potential at the sarcolemma
Answer: B
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The vegetative state is characterized by long sleep–wake cycles and detectable awareness
a. True b. False Indicate whether the statement is true or false
A person in a moderate environment would lose the greatest volume of water in
A. feces. B. sweat. C. mucus. D. urine.
All red blood cells in an adult originate in the:
A) red bone marrow. B) spleen. C) liver. D) heart.
The primary function of the antidiuretic hormone (ADH) is:
A. increased renal output of urine. B. facilitation of water excretion. C. promotion of water retention.