One difference between cardiac and skeletal muscle contractions is that in cardiac muscle
A. acetylcholine has a more excitatory effect.
B. the H zones increase in size while the I bands decrease in size.
C. there are no thin filaments.
D. some of the calcium used for contraction comes from outside the cell.
Answer: D
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Spastic paralysis suggests involvement of the ________
A) spinal nerve roots B) lower motor neurons C) neuromuscular junction D) upper motor neurons
__________ feedback loops cause a change in a regulated variable in the opposite direction of the initial change.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not secreted by glands?
A. Hormones B. Mucin C. Enzymes D. DNA E. Waste products
Defense of the body against a particular pathogen is provided by
A) nonspecific immunity. B) specific immunity. C) immunological surveillance. D) skin defenses. E) fever.