Contraction of which of the following muscles would raise the eyebrows in a look of surprise?
A. Levator anguli oris
B. Levator palpebrae superioris
C. Zygomaticus major
D. Procerus
E. Frontalis
Answer: E. Frontalis
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The sustentacular cells
A. mature to form sperm cells. B. produce testosterone. C. provide nourishment for development of sperm. D. cover and protect most of the testes. E. produce seminal fluid.
During the flight or fight response, sympathetic pathways cause arterioles to contract. If this is true, how is it possible to increase blood flow to areas that require additional oxygen, such as skeletal muscle?
What will be an ideal response?
Tissue damage can trigger local release of histamine, which can
A. stimulate release of nitric oxide, a vasoconstrictor. B. inhibit release of nitric oxide, a vasodilator. C. stimulate release of nitric oxide, a vasodilator. D. inhibit release of nitric oxide, a vasoconstrictor.
The apical heartbeat is heard by listening between the fifth and sixth ribs about 7.5 cm
left of the midline. Indicate whether the statement is true or false