In addition to protection (physical and chemical barrier), the skin serves other functions. Which of the following is another vital function of the skin?
A) It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism.
B) It aids in the transport of materials throughout the body.
C) The cells of the epidermis store glucose as glycogen for energy.
D) It absorbs vitamin C so that the skin will not be subject to diseases.
A) It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism.
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The partial pressure of oxygen in the pulmonary veins is
a. about 40 mmHg b. equivalent to alveolar partial pressure c. dramatically different than pulmonary arteries partial pressure d. equivalent to the partial pressure of oxygen in the arteriolar ends of systemic capillaries e. all of the above
Which factor below does not slow down gastric activities?
a. enterogastric reflex. b. entergastrones. c. secretin. d. gastrin. e. cholecystokinin.
In which phase of the cell cycle is DNA replicated?
A. G2 B. S C. Telophase D. Anaphase E. G1
Muscle spasms of the back often are due to the erector spinae contraction
Indicate whether the statement is true or false