Each of the following factors would increase peripheral resistance except
A) increased sympathetic stimulation.
B) elevated levels of epinephrine.
C) vasodilation.
D) irregularities in the vessel walls caused by plaques.
E) elevated hematocrit.
C
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During ventricular systole, what occurs when the pressure in the left ventricle rises above that in the left atrium?
a. the left AV valve closes b. the left AV valve opens c. the aortic valve closes d. all the valves close
At birth the hairs of the scalp, eyelids, and eyebrows are replaced by coarser pigmented hairs called
A. lanugo hairs. B. primary hairs. C. pubic hairs. D. vellus hairs. E. terminal hairs.
Masses of gray matter deep within the cerebrum that help integrate motor commands are the
A. Broca's areas. B. corpus callosum. C. basal nuclei. D. association areas.
Which protein binds oxygen and carbon dioxide?
A. Hemoglobin B. Albumin C. Erythropoietin D. Anemia