Melanocyte-stimulating hormones play a role in determining the different amount of melanin in the skin of various human races
Indicate whether the statement is true or false
F
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The descending limb of the nephron loop ________
A) is not permeable to water B) is freely permeable to sodium and urea C) contains fluid that becomes more concentrated as it moves down into the medulla D) pulls water by osmosis into the lumen of the tubule
A deep bridge of nerve fiber called the ____________________ connects the two cerebral hemispheres
Fill in the blank(s) with correct word
Phosphodiesterase functions
A. activates cGMP. B. to attach phosphate groups to enzymes. C. as a membrane-bound receptor molecule. D. to inactivate cyclic AMP. E. to combine GTP with cyclic AMP.
An increase in a membranes permeability to Na+ will result in __________ of the membrane.
Fill in the blank(s) with the appropriate word(s).