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Select the MOST CORRECT answer. Countercurrent exchange... occurs in the gills of most fish when water...

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Medical Sciences

Select the MOST CORRECT answer. Countercurrent exchange...

occurs in the gills of most fish when water and blood flow inopposite directions allowing gas exchange.

does not require energy for gas exchange, as oxygen and carbondioxide move down their concentration gradient.

is a process used in capillary beds of mammalian lungs.

Both a) and b) are correct and c) is incorrect.

a), b) and c) are all correct.

Regarding human reproduction (select the MOST CORRECTstatement):

At the time of ovulation, the released ovum has not completedmeiosis.

In the absence of pregnancy, the corpus luteum degenerates andplasma progesterone levels decline.

Fertilization results in the formation of a zygote, which is asingle diploid cell that implants in the uterus.

Both a) and b) are correct and c) is incorrect

a), b) and c) are all correct

Answer & Explanation Solved by verified expert
3.8 Ratings (453 Votes)
ANSWER 1 The countercurrent exchange occurs in the gills of most fish when water and blood flow in opposite directions allowing gas exchange and it does not require energy for gas    See Answer
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