Which of the following statements is true regarding parasympathetic tone?
A) It might increase or decrease heart rate depending on the situation.
B) It accelerates the resting heart rate above its intrinsic rate.
C) It holds the resting heart rate below its intrinsic rate.
D) It affects heart rate only after myocardial infarction.
E) It does not affect heart rate.
C
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Van der Waals forces occur between nonpolar molecules and are weaker attractions than covalent bonds.
Indicate whether this statement is true or false.
One of the features of the Cori cycle is the
A) Conversion of muscle-derived lactate into glucose by the liver. B) Oxidation of lactate by the heart. C) Conversion of lactate into glycogen by the muscle fibers. D) All of the above
Upon binding to a receptor to form a hormone-receptor complex, steroid hormones may cause:
A.)the activation of protein kinases. B.)an increase in protein synthesis. C.)the activation of adenylate cyclase. D.)the formation of cAMP.
Which statement about enzymes is false?
A) Enzymes raise the activation energy needed to start a reaction. B) Enzymes are composed mostly of protein. C) Enzymes are organic catalysts. D) Enzymes may be damaged by high temperature.