A patient undergoes a skin graft from the back to cover a damaged area on the neck. This is an example of what type of transplant?
A. Heterograft
B. Xenograft
C. Allograft
D. Autograft
Ans: D. Autograft
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True or False: The division of bilaterians into coelomate, acoelomate and pseudocoelomate groups is supported by molecular studies
A. true B. false
Contraction of the diaphragm ____
a. diminishes the volume of the thoracic cavity b. increases the volume of the thoracic cavity c. pushes the rib cage downward d. causes external intercostal muscles to relax e. decreases lung capacity
Root hairs are:a
flattened extensions of epidermal cells. b. formed once in the area of cell maturation. c. small in number. d. located in front of the root tip. e. short-lived
At night, we see primarily black and white and shades of gray, except near lights where some color is still evident. This is outward evidence of what internal anatomy?
A. The retina has a circadian rhythm. B. The lens filters differentially the many wavelengths of light. C. Cones detect the color of an object, and are activated by bright light. D. There are more cones than rods and cones are very sensitive to light. E. The vitreous humor filters much light, and daytime intensity is necessary to get colored light through to the retina.