Arm and leg muscles are arranged in antagonistic pairs. How does this affect their functioning?
A) It provides a backup if one of the muscles is injured.
B) One muscle of the pair pushes while the other pulls.
C) It allows the muscles to produce opposing movements.
D) It allows one group of muscles to have fast-twitch fibers and the other to have slow-twitch fibers.
C
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A) basophils. B) macrophages. C) plasma cells. D) T cells.
Which of the following living reptiles care for their young and have a four-chambered heart, as birds do?
A. turtles B. crocodiles C. lizards D. snakes E. tuataras
Each antibody has ______ binding site(s); binding of antibodies to a virus particle results in the particles being ________
a. one; disrupted and hydrolyzed b. two; disrupted and hydrolyzed c. two; clumped with other particles d. three; disrupted and hydrolyzed e. three; clumped with other particles
Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?
A) stimulating saltatory conduction B) stimulating depolarization of postsynaptic neurons C) inhibiting postsynaptic neurons from repolarizing D) inhibiting presynaptic neurons from depolarizing E) stimulating depolarization of presynaptic neurons