Despite its apparent durability, the dermis is subject to tearing. How might a person know that the dermis has been previously stretched and/or torn?
A) The blood vessels in the dermis rupture and the blood passes through the tissue, causing permanent "black-and-blue marks."
B) The appearance of visible, silvery-white scars is an indication of stretching of the dermis.
C) The stretching causes the tension lines to disappear.
D) There is an episode of acute pain due to the large number of tactile corpuscles.
B
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Compare and contrast the structural and functional differences between single -unit and multi-unit smooth muscle fibers, particularly in regard to their ability to vary their force of contraction.
What will be an ideal response?
Which of the following statements concerning receptor potentials is correct? Receptor potentials
a. are usually depolarizations of receptors in response to adequate stimuli. b. are graded potentials. c. occur in neuronal cell bodies upon summation of pre synaptic input. d. both (a) and (b) above. e. all of these answers.
Which of the following events occurs when erythrocytes are destroyed?
A. Urine output increases. B. Bile is manufactured by the gallbladder. C. Heme is transported by transferrin to the liver. D. The globin portion of the molecule is broken down into amino acids. E. Iron is secreted into the bile.
The inability of the kidneys to excrete adequately to maintain homeostasis is termed
A) glomerulonephritis. B) polycystic kidney disease. C) calculi. D) renal failure. E) hematuria.