The minimum depolarization needed to open Na+ gates is called the ________.
A. threshold
B. refractory period
C. repolarization
D. all-or-none law
Answer: A
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Measles can inflame the testes, impairing fertility by destroying cells in the seminiferous tubules.
Answer the following statement true (T) or false (F)
The foramen ovale ________
A) connected the two atria in the fetal heart B) is a condition in which the heart valves do not completely close C) is a connection between the pulmonary trunk and the aorta in the fetus D) is a shallow depression in the interventricular septum
Which statement regarding gastric motility and emptying is incorrect?
a. increased fluidity allows more rapid emptying. b. presence of acid and fat in the stomach initiates the enterogastric reflex. c. increased gastric volume stimulates motility. d. vagal activity stimulates motility. e. distention of the stomach initiates short reflexes.
Which class of nutrients do we require the least of?
A. Water B. Vitamins C. Proteins D. Carbohydrates E. Lipids