Drugs known as calcium channel blockers such as nifedipine can be used to
A) decrease the force of cardiac contraction.
B) increase blood pressure.
C) increase the rate of cardiac contraction.
D) increase the force of contractions.
E) decrease afterload.
Answer: A
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A) Trypsin B) Chymotrypsin C) Carboxypeptidase D) All of the above
Low levels of ___ can have dire consequences on the functioning of neurons because of its role in membrane repolarization
A. sodium ions B. potassium ions C. chloride ions D. hydrogen ions
Sequence the following events correctly
1 . Neurotransmitter diffuses across cleft. 2 . Calcium induces exocytosis of neurotransmitter. 3 . Permeability of postsynaptic membrane altered. 4 . Ion channels open. 5 . Neurotransmitter binds to receptor. a. 1, 2, 3, 5, 4 b. 1, 4, 3, 2, 5 c. 2, 1, 5, 4, 3 d. 3, 1, 4, 5, 2 e. 5, 4, 3, 1, 2
Which of the following is the primary factor in the maintenance of a cell's negative charge during resting membrane potential?
A) sodium-potassium pump B) voltage-gated channels C) ligand-gated channels D) leak channels