Which of the following junctions influences the
passage of ions and small molecules between cells?
a. gap
b. adhering
c. loose
d. tight
e. gated
Answer: a
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Where do sperm form?
a. The vas deferens b. The epididymus c. The corpus cavernosum d. The seminiferous tubules
Blood vessels show which sign of aging?
a. Elastin fibers in their walls are replaced by collagen or calcium deposits. b. The muscles become softer and expand more easily. c. The smooth muscle layer constricts more readily. d. Elastin fibers double in quantity. e. The veins develop more valves.
All of these humans are believed to have evolved in Africa EXCEPT
Select one: a. Homo erectus. b. Homo habilis. c. Homo rudolfensis. d. Neandertals. e. Homo ergaster.
The adrenal hormone, aldosterone, regulates kidney function by
A. triggering a sensation of thirst. B. increasing the permeability of the collecting duct to urea. C. stimulating active reabsorption of sodium, decreasing its excretion. D. increasing the permeability of the collecting duct to salt. E. reducing the blood flow to the kidney.