Vessels that sometimes do not have a basal lamina are called
A) fenestrated capillaries.
B) venules.
C) continuous capillaries.
D) sinusoidal capillaries.
E) lacteals.
D) sinusoidal capillaries.
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Mr. Gregory comes to the doctor with high blood pressure. Tests show that he also has elevated levels of renin in his blood and atherosclerotic plaques that have nearly blocked blood flow through his renal arteries. Mr. Gregory is puzzled. Explain to him how decreased blood flow in his renal arteries could cause renin secretion to increase. Map the pathways through which elevated renin causes
high blood pressure for Mr. Gregory. What will be an ideal response?
All of the following occur when the temperature of the preoptic area of the hypothalamus drops below its thermostat setting except
A) blood flow to the skin increases. B) shivering thermogenesis occurs. C) nonshivering thermogenesis occurs. D) epinephrine levels rise. E) blood returning from limbs is shunted to deep veins.
Botulism toxin prevents release of ACh, causing ________.
A. spastic paralysis B. flaccid paralysis C. hemiplegia D. None of the choices are correct.
The plateau of the cardiac action potential results from the opening of voltage-gated slow ____ channels in the plasma membrane of the cardiac cell
a. sodium b. potassium c. calcium d. chloride e. glucose