Muscle atrophy that progresses with aging is caused by reduction in
A) myoglobin. B) all of the above.
C) ATP. D) the sizes of muscle fibers.
B
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Which is the first type of connective tissue to form in the embryo and the source of all other adult connective tissues?
A. Umbilical B. Adipose C. Mesenchyme D. Areolar E. Mucous
A male expresses?
A. only the homozygous dominant alleles on his X chromosome. B. only the homozygous recessive alleles on his X chromosome. C. none of the alleles on his X chromosome. D. both the dominant and recessive alleles on his X chromosome. E. only the dominant alleles on his X chromosome.
Which is TRUE about the Na+, K+ ATPase pump in neurons?
A. It maintains an electrical gradient at the equilibrium potential of K+. B. It pumps 3 Na+ ions into the cell for every 2 K+ ions it pumps out. C. It transports equal numbers of sodium and potassium ions with each pump cycle. D. It maintains a concentration gradient for K+ such that diffusion forces favor movement of K+ into the cell. E. It generates a small electrical potential such that the inside is made negative with respect to the outside.
Match the eye structure with the appropriate description.A. Blood vessels enter and the optic nerve exits hereB. A small yellow spot near the center of the posterior retinaC. The portion of the retina with the greatest visual acuityD. A jelly-like substance in the posterior cavity of the eyeE. The fluid that fills the anterior cavity of the eyeAqueous humor
Fill in the blank(s) with the appropriate word(s).