The rising phase of the action potential is due to
a. calcium equilibrium.
b. potassium efflux.
c. potassium influx.
d. sodium efflux.
e. sodium influx.
E
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The first heart sound ("lubb") is associated with
A) atrial systole. B) closing of the atrioventricular valves. C) opening of the atrioventricular valves. D) closing of the semilunar valves. E) opening of the semilunar valves.
Which of the following chemicals paralyzes skeletal muscle by binding to the acetylcholine receptor sites?
a. black widow spider venom. b. curare. c. organophosphates. d. DDT. e. local anesthetics.
Replacement of dead and damaged cells with the same types of cells is called ________.
Fill in the blank(s) with the appropriate word(s).
Electrons
A. are located in the nucleus of an atom. B. comprise the majority of the mass of an atom. C. are the subatomic particles most involved in bonding behavior of atoms. D. do not participate in the bonding of atoms. E. have a positive charge of one.