What region of the cardiovascular system contains valves?

A) heart only
B) metarterioles only
C) veins only
D) both the heart and veins
E) the heart, metarterioles, and veins


Answer: D) both the heart and veins

Biology & Microbiology

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An example of an inhibitory neurotransmitter is

A) acetylcholine. B) epinephrine. C) dopamine. D) GABA. E) insulin.

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How are the feeding habits of lampreys best described?

a. suspension feeding b. predatory c. parasitic d. scavenging e. passive

Biology & Microbiology

A(n) __________ property is a characteristic of a

system that does not appear in any of its component parts. a. efferent b. emergent c. elective d. energetic e. living

Biology & Microbiology

The prevalence of a disease can be calculated as the (total number of cases in population) divided by the (total number of people in population) time (____)

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology