Tidal volume is air ________.
A) remaining in the lungs after forced expiration
B) exchanged during normal breathing
C) inhaled after normal inspiration
D) forcibly expelled after normal expiration
B) exchanged during normal breathing
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A posterior root contains
A. sensory axons only. B. motor axons only. C. a mix of sensory and motor axons. D. autonomic nervous system axons.
Which muscle surrounds the anus?
A) levator ani iliococcygeus B) pubococcygeus C) external anal sphincter D) external urethral sphincter
As a bone increases in diameter, what happens to the medullary cavity?
A) The medullary cavity increases in diameter because bone matrix is removed by osteoblasts. B) The medullary cavity increases in diameter because bone matrix is removed by osteoclasts. C) The medullary cavity decreases in diameter because bone matrix is added by osteoclasts. D) The medullary cavity decreases in diameter because bone matrix is added by osteoblasts. E) The medullary cavity diameter does not change but fills in with more bone marrow.
Which statement about the bronchi is false?
A. The main bronchi and all of their further branches make up the bronchial tree. B. The right bronchus is slightly more horizontal than the left bronchus due to the location of the heart. C. The right and left main bronchi each enter their respective lung at the hilum. D. All of these statements are false.