Human chorionic gonadotropin
a. is secreted by the corpus luteum of pregnancy.
b. in the urine is the basis of pregnancy diagnosis tests.
c. stimulates placental secretion of estrogen and progesterone.
d. both (a) and (b) above.
e. all of these answers.
B
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Vertebrate striated muscles composed of twitch fibers are able to produce a graded contraction by
A) Recruiting different numbers of motor units. B) Summing EPSPs in the motor end-plate region. C) Having excitatory and inhibitory input to a single muscle. D) Vertebrate muscles are unable to produce graded contractions.
The glomerular capillary blood pressure in the nephron is 78 mm Hg. The Bowman's capsular hydrostatic pressure is 24 mm Hg. The colloidal osmotic pressure is 18 mm Hg. The net filtration pressure is ____ mm Hg
a. 18 b. 26 c. 36 d. 42 e. 78
The epidermal layer found only in thick skin is ________.
A. stratum lucidum B. stratum basale C. stratum spinosum D. stratum corneum E. stratum granulosum
Which statement is true about synovial joints?
A) Ball and socket joints are multiaxial. B) Hinge joints are biaxial. C) Condyloid joints are uniaxial. D) Pivot joints are biaxial.