Presbyopia is characterized by
a. the lack of a cone type.
b. pronounced visual difficulty in the early teenage years.
c. a reduction in accommodative ability as a result of a loss of lens elasticity.
d. retinal damage.
e. excessive refractive power in the lens system of the eye.
C
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Which labeled cell in the diagram is a WBC?
a) A b) B c) C d) Both B and C e) All of these choices
Lengthwise, long bone growth during infancy and youth is exclusively through ________.
A) interstitial growth of the epiphyseal plates B) the secretion of bone matrix into the medullary cavity C) differentiation of osteoclasts D) calcification of the matrix
Which of the following is true about smooth muscle?
A) Certain smooth muscle cells can actually divide to increase their numbers. B) Smooth muscle has well-developed T tubules at the site of invagination. C) Smooth muscle, in contrast to skeletal muscle, cannot synthesize or secrete any connective tissue elements. D) Smooth muscle cannot stretch as much as skeletal muscle.
How long after fertilization does the blastocyst implant into the endometrium?
A. 1 day B. 13-14 days C. 6-7 days D. 21 days E. 2-3 days