Which best describes a "myofibril"?
A. It is composed of a single type of protein and forms cross-bridges.
B. It is a cylindrical cellular organelle composed of myofilaments.
C. It is a single skeletal muscle cell.
D. It is a fibrous junction between a muscle cell and a tendon.
E. It is a hollow membranous structure that stores calcium.
Answer: B
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What does label B represent?
A) disulfide bond
B) variable segment
C) light chain
D) heavy chain
E) constant segments of light and heavy chains
Which of the following is a direct effect of sympathetic activation on kidney function?
A) powerful vasodilation of afferent arterioles B) increased production of filtrate C) powerful vasoconstriction of efferent arterioles D) powerful vasodilation of efferent arterioles E) decreased glomerular filtration rate
The hypothalamic-hypophyseal portal system is a special blood supply that provides a connection between the hypothalamus and the pituitary gland.
a. true b. false
A person with blood type A has which antigen?
A. A B. B C. A and B D. Neither A nor B