Which type of vessels have thick walls and are capable of greater degrees of vasoconstriction and vasodilation to control blood flow? (They are also called "distributing arteries.")
A) elastic arteries
B) muscular arteries
C) arterioles
D) capillaries
Ans: B) muscular arteries
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Pulsating exophthalmos is associated with:
A) tear of the lacrimal artery. B) tear of the inferior ophthalmic vein. C) arteriovenous fistula within the cavernous sinus. D) rupture of the pterygoid venous plexus. E) section of the oculomotor nerve.
What happened to the composition of the solution inside the reaction chamber as a catalase reaction proceeded? Why was it a good practice to start with fresh hydrogen peroxide for each experimental trial?
What will be an ideal response?
A patient has edema in the legs after prolonged standing. This edema is most likely caused by:
a. Closed lymphatic channels b. Decreased capillary permeability c. Decreased oncotic pressure d. Increased capillary hydrostatic pressure
In neurophysiology, the term "summation" refers to the addition of
A. excitatory neurotransmitter molecules at a receptor. B. action potentials at the node of Ranvier. C. postsynaptic potentials at the initial segment. D. presynaptic hyperpolarizations. E. resting membrane potentials in a particular area of the brain.