During development, some embryonic blood cells
A) differentiate into stem cells.
B) move out of the peripheral tissues and into circulation.
C) appear during the eighth week of development.
D) enter the circulation to differentiate further.
E) None of the answers are correct.
A) differentiate into stem cells.
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All ANS preganglionic axons release _____________ as their neurotransmitter
Fill in the blank with correct word.
The forceful expulsion of semen from the urethra caused by contraction of smooth muscle in the urethra and skeletal muscle surrounding the base of the penis is called
A. ejaculation. B. neutralization. C. physiological contracture. D. emission. E. orgasm.
All of the following are effects of aging on the respiratory system except which one?
A. Obstructive sleep apnea may develop in the elderly as the pharyngeal muscles intermittently relax and block the airway during sleep. B. With age, less mucus accumulates in the respiratory tract because the ciliated escalator becomes more efficient. C. Thoracic wall compliance decreases due to the diminished ability to expand the chest. D. Some of the alveoli walls may breakdown, which reduces the area of the respiratory membrane.
A "widow's hump" or "dowager's hump" is an exaggerated thoracic curvature that is technically called ________.
Fill in the blank(s) with the appropriate word(s).