Eyebrow hairs are always shorter than hairs on your head because ________
A) eyebrow follicles are only active for a few months
B) hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length
C) they grow much slower
D) the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle
A
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The function of upper motor neurons is to
A. directly excite skeletal muscle cells. B. excite or inhibit skeletal muscle cells. C. excite or inhibit lower motor neurons. D. excite motor portions of the thalamus. E. excite or inhibit motor portions of the cerebral cortex.
A smooth, grooved articular process, shaped like a pulley, is a(n) ________.
A) trochlea B) spine C) line D) crest E) trochanter
Which of the following routes of blood flow is correct?
A. Heart ? distributing artery ? conducting artery ? arteriole ? capillary ? venule ? large vein ? medium vein ? heart B. Heart ? venule ? medium vein ? large vein ? capillary ? conducting artery ? distributing artery ? arteriole ? heart C. Heart ? large vein ? medium vein ? venule? capillary ? arteriole ? distributing artery ? conducting artery ? heart D. Heart ? conducting artery ? distributing artery ? arteriole ? capillary ? venule ? medium vein ? large vein ? heart
What are the smallest living units of biologic organization?
a. atoms b. cells c. organelles d. systems