The three layers of the eyeball, from outer to inner, are:
What will be an ideal response?
fibrous, vascular, and neural layers.
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The trigone is found in the:
a. urethra b. urinary bladder c. ureter d. nephron
Why can't tetanus occur in the heart?
a. There are no distinct motor units in the heart. b. There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c. The refractory period in cardiac muscle lasts almost as long as the contraction. d. The heart contracts with maximal force every beat so it is impossible to increase the strength of its contraction. e. Vagal stimulation slows down the heart rate to prevent summation of contractions.
Collagen, elastin, and reticular fibers in connective tissues are all considered ________.
A. carbohydrates B. adipose tissue C. proteins D. triglycerides E. phospholipids
In general, as an artery's diameter decreases, the artery walls show
A. a decrease in the relative amount of smooth muscle and an increase in the relative amount of elastic fibers.
B. an increase in the relative amount of smooth muscle and a decrease in the relative amount of elastic fibers.
C. an increase in relative amounts of smooth muscle and elastic fibers and a decrease in endothelium.
D. a decrease in both smooth muscle and elastic fibers and an increase in areolar connective tissue.