The refractory period
A. is the time during which the tissue cannot respond again.
B. results in complete and incomplete tetanus.
C. is the condition in which the muscle fiber only partially relaxes between contractions.
D. is the condition in which stimuli occur so rapidly that there are no intervening relaxations.
E. is the constant tension produced by muscles for long periods of time.
A
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A process that requires cellular energy to move a substance against its concentration gradient is called
A) active transport. B) passive transport. C) facilitated transport. D) osmosis. E) diffusion.
A person who has poor emotional control and difficulty in remembering past events might have a lesion in the ________.
Fill in the blank(s) with the appropriate word(s).
Cells capture a portion of nutrient energy in the high-energy phosphate bonds of:
a. ADP b. ATP c. phosphatase d. glucose e. amino acids
alternative forms of a gene are known as ______________.
Fill in the blank(s) with the appropriate word(s).