Which of the following affect heart rate through the use of a cAMP second-messenger system?
A) norepinephrine
B) epinephrine
C) acetylcholine
D) epinephrine and norepinephrine
E) acetylcholine, epinephrine and norepinephrine
Answer: D) epinephrine and norepinephrine
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Osmosis takes place when water goes from an area of low water concentration to an area of high water concentration
Indicate whether the statement is true or false
All of the following are functions of the circulatory system, except
A. excretes waste products. B. regulates blood pressure. C. carries blood. D. transports nutrients. E. directs blood flow to tissues.
Bid is the Latin abbreviation for twice daily
a. true b. false
Similar to neurotransmitters, hormones exert their action only on cells that have specific _______________ that the hormones bind to.
a) gated channels b) receptors c) metabolic pathways