Lymphatic capillaries are known for all of the following except
A) being the starting point of the lymphatic circulation.
B) being the smallest lymphatic vessels.
C) having larger diameters and looser walls than blood capillaries.
D) having shingle-like endothelial cells.
E) allowing nutrient and gas exchange.
E
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Most CNS neurons lack centrioles. This observation explains
A) why CNS neurons grow such long axons. B) why CNS neurons cannot divide. C) the ability of neurons to generate an action potential. D) the ability of neurons to communicate with each other. E) the ability of neurons to produce a resting potential.
Upper motor neurons can originate in:
a. precentral gyrus b. cranial nerves 3,4,5,6,7,9,11,12 c. the anterior grey horn d. all of the above
On day 14 of a typical 28 day menstrual cycle, LH concentration in the blood will be ________. The endometrium will be ________. Estrogen concentration in the blood is ________
A. level; sloughing off; low B. at or near a peak; near the end of the proliferative phase; relatively high C. low but rising; in the secretory phase; high D. at or near a peak; in the secretory phase; low E. level; starting the proliferative phase; level but high
Which of the following cell types binds to antigens on plasma membranes of target cells and directly destroys the cells?
A. neutrophils B. NK cells C. cytotoxic T cells (CD8 cells) D. helper T cells (CD4 cells) E. B cells