Exchange between a blood vessel and the cells that surround it can occur only in
A) arteries.
B) arterioles.
C) veins.
D) venules.
E) capillaries.
Answer: E
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Which of the following statements are true regarding an ectopic pregnancy?
A. It usually begins as a tubal pregnancy. B. It may involve implantation of the conceptus on the surface of the uterus. C. It may end in a live birth by caesarian section. D. It may involve implantation of the conceptus on the surface of the colon. E. All of these choices are correct.
The baroreceptor reflexes affect sodium balance by
a. causing release of renin b. causing the release of vasopressin c. lowering GFR through vasoconstriction of afferent arterioles d. lowering GFR through vasodilation of afferent arterioles e. none of the above
The umbilical arteries branch from the
A) thoracic aorta. B) abdominal aorta. C) celiac trunk. D) common iliac arteries. E) internal iliac arteries.
Amanda has no visual impairments, but has noticed that in order to see clearly she must hold books farther from her face in order to read. What is happening to Amanda's vision?
A. Her lens is becoming more opaque with age. B. Her vitreous humor is becoming thicker with age. C. Her lens is becoming more flexible with age. D. Her lens is becoming more rigid with age. E. Her lens is becoming more convex with age.