Which is the deepest and innermost layer of the heart wall?
A) parietal layer of the epicardium
B) endocardium
C) myocardium
D) fibrous pericardium
E) visceral layer of the epicardium
Ans: B) endocardium
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The trabeculae of spongy bone
A) are organized parallel to the long axis of the bone. B) are organized along stress lines. C) are composed mostly of cartilage. D) will collapse under stress. E) are concentrated in the cortex of the diaphysis.
The paranasal sinuses:
a. are lined with mucosa continuous with the nasal cavity b. help lighten the weight of the skull bones c. act as resonant chambers for sound d. all of the above
For most cells, the membrane potential is closer to the Ek+ (-90 mV) than for ENa+ (+ 60 mV). This is because
a. EK+ <<<< ENa+, and systems tend toward lower energy states. b. cells like potassium better than sodium, so they work to maintain potassium closer to its equilibrium distribution. c. cell membranes are equally permeable to Na+ and Cl-, so every time a Na+ comes in, its depolarizing effect is negated by a Cl- ion. d. cell membranes are more permeable to K+ than Na+, so there are a greater number of pathways available for K+ to move towards its equilibrium distribution than are available for Na+ to do the same. e. none of these.
When it is cold, the ________ contracts and draws the testes closer to the body to keep them warm.
A. perineum B. corpus cavernosum C. cremaster D. corpus spongiosum E. pampiniform plexus