Endocrine 1 Flashcards
Most all of the protein or amino acid based hormones exert their effects through
second messengers.
The second messenger mechanism of hormone action operates through:
A.not responding to a feedback mechanism.
B.synthesizing more of the hormone than is actually needed.
C.binding to specific receptors and employing the services of G proteins and cAMP. D.increasing the basal metabolic rate in the target organ.
C.binding to specific receptors and employing the services of G proteins and cAMP.
Hormones are removed from circulation by:
A.binding to receptors on target cells.
B.being broken down by enzymes in the liver. C.being broken down by enzymes in the kidneys.
D.All of the above are correct.
D.All of the above are correct.
Which of the following is true about transport proteins?
A.They make lipid soluble hormones temporarily water soluble
B.They are synthesized by the liver
C.They act to slow the rate of hormone loss in the urine
D.They provide a ready reserve of hormone
E.All of the above are true
E.All of the above are true
Neither follicle stimulating (FSH) hormone nor testosterone alone can stimulate significant sperm production, whereas when they act together, the testes produce some 300,000 sperm per minute. This is an example of which principle regarding hormones?
Synergistic effect
The link between a first messenger and a second messenger in a cell that responds to hydrophilic hormones is usually
G protein.
Most hormones are taken up and degraded by the __________ and __________.
liver; kidney
The drug RU486 can induce miscarriage or abortion because it
blocks progesterone receptors.
Growth hormone hypersecretion causes gigantism when it begins in childhood, but it is more likely to cause __________ when it begins in adulthood.
acromegaly
TRUE or FALSE Hormones are chemical messengers that are transported by the bloodstream and stimulate physiological responses in cells of another tissue or organ.
TRUE
TRUE or FALSE The nervous system adapts relatively slowly and may respond for days to weeks.
FALSE
TRUE or FALSE The nervous system releases neurotransmitters at synapses at specific target cells.
True
The ability of a specific tissue or organ to respond to the presence of a hormone is dependent on
the presence of the appropriate receptors on the cells of the target tissue or organ.
With regard to the endocrine system, down regulation refers to the fact that:
A.deficiency of hormone, produces an increase in the number of receptors.
B. all target organs respond differently to a specific hormone.
C. all target organs respond the same to a specific hormone.
D. excess hormone, produces a decrease in number of receptors.
D. excess hormone, produces a decrease in number of receptors.
The function of the endocrine system is to:
A. coordinate body functions.
B. maintain homeostasis.
C. both coordinate body functions and maintain homostasis.
D. None of the choices are correct.
C. both coordinate body functions and maintain homostasis.
