_____ occurs when the inside of the plasma membrane becomes more negative, and ______ occurs when the inside of the plasma membrane becomes less negative.
a. Depolarization, repolarization
b. Depolarization, hyperpolarization
c. Hyperpolarization, depolarization
Answer: c. Hyperpolarization, depolarization
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The brain has a ________ (high or low?) demand for oxygen, and receives about ________% of the total blood volume in circulation.
A) high; 15 B) high; 50 C) high; 35 D) low; 35 E) low; 15
The liver is located behind the stomach
Indicate whether the statement is true or false
During exercise, the energy necessary to sustain skeletal muscle cell contraction comes from
A. increased insulin production. B. increased epinephrine and glucagon release. C. decreased sympathetic nervous system activity. D. storing glucose as glycogen. E. conservation of glucose.
Negative feedback loops are ________.
A. not homeostatic mechanisms B. homeostatic mechanisms C. associated with "vicious circles" D. self-amplifying cycles E. usually harmful