During stress, ACTH is produced by the _______ and acts on target cells in the ______
a. hypothalamus; adrenals
b. hypothalamus; pituitary
c. pituitary; hypothalamus
d. pituitary; adrenals
e. adrenals; hypothalamus
D; The brain produces CRH (a medium-sized peptide) when a person is under stress. The CRH acts on the pituitary, which releases ACTH (a large peptide), which acts on the adrenal cortex, prompting it to release cortisol (a steroid).
You might also like to view...
Ribozymes
a. are RNA catalysts. b. are proteins that catalyze RNA synthesis. c. are RNA molecules that slow the rate of protein synthesis. d. are the products of RNA degradation. e. are amino acids that catalyze RNA synthesis
The element present in all organic molecules is _____
A) hydrogen B) oxygen C) carbon D) nitrogen
The first cloned cat, called Carbon Copy, was a calico, but she looked significantly different from her female parent because _____
A) the cloning was done poorly and it was likely that some contaminating cat DNA became part of Carbon Copy's genome B) fur color genes in cats is determined by differential acetylation patterns C) cloned animals have been found to have a higher frequency of transposon activation D) X inactivation in the embryo is random and produces different patterns
How is bone repair different from bone development?
A. Osteoclasts are involved in bone development but not in bone repair. B. Osteoblasts are not involved in bone repair but they are in bone development. C. A hematoma indicates an injury has occurred. D. Only spongy bone is built in bone repair while both spongy and compact bone are built in bone development. E. There is no cartilage involved in bone repair but there is in bone development.