What structure regulates the amount of light that passes to the photoreceptors of the eye?
A) vitreous body
B) cornea
C) ciliary muscle
D) iris
E) lens
D
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Lymphatic capillaries
A. are abundant in epithelial tissues. B. lack a basement membrane. C. are smaller in diameter than blood capillaries. D. are open at both ends. E. have wide gaps between endothelial cells.
Alpha islet cells produce ________, an extremely potent hyperglycemic hormone.
Fill in the blank(s) with the appropriate word(s).
The complex known as the triad consists of
A) one transverse tubule and two terminal cisternae. B) one sarcomere, one sarcoplasmic reticulum, and one sarcoplasm. C) actin, myosin, and myofilaments. D) one A band, one H zone, and one I band. E) myofilaments, myofibrils, and sarcomeres.
How does the mucosa of the rectum compare with that of the colon and cecum?
a. the rectum is lined with stratified columnar epithelium, whereas the colon and cecum are lined with simple columnar epithelium b. the colon and cecum are lined with a simple columnar epithelium for absorption, whereas the rectum is lined with stratified squamous epithelium because it is next to an opening to the exterior c. the colon and cecum are lined with a simple cuboidal epithelium for absorption, whereas the rectum is lined with transitional epithelium to allow for expansion during defecation d. none of the listed responses is correct; the epithelial lining is constant throughout the large intestine