Which of the following structures begins the process of digestion?
a. Stomach.
b. Small intestine.
c. Teeth.
d. Esophagus.
Answer: c. Teeth.
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Skeletal muscle fibers differ from "typical cells" in that these muscle fibers
A) lack a plasma membrane. B) have many nuclei. C) are very small. D) lack mitochondria. E) contain endoplasmic reticulum.
In juxtamedullary nephrons, the efferent arterioles and peritubular capillaries are connected to a long, slender series of capillaries that accompany the nephron loops into the medulla. These are (the)
A) vasa recta. B) cortical radiate veins. C) segmental arteries. D) arcuate arteries. E) None of the answers are correct.
Cadaver dissection is against the law in the United States
Indicate whether the statement is true or false
In the female menstrual cycle ________.
A. menstruation occurs during the last four days of the cycle B. ovulation is stimulated by decreasing concentrations of progesterone C. the luteal phase is characterized by high circulating concentrations of estrogens D. progesterone secretion is stimulated by LH