Question 122 How do drugs like beta-blockers and calcium-channel blockers cause

Question

Question 122

How do drugs like beta-blockers and calcium-channel blockers cause the heart to relax?

A.They block receptors that cause muscle contraction.

B.They block the re-uptake of neurotransmitters that tell the heart to beat faster.

C.They increase the release of neurotransmitters that slow the heart beat.

D.All of these

E.None of these

Question 123

Why do plaque deposits make pumping blood more difficult?

A.The veins and arteries are less elastic.

B.The volume of the blood vessels decreases.

C.A higher pressure is required to force blood through the vessels.

D.All of these

E.only The veins and arteries are less elastic and The volume of the blood vessels decreases

Question 124

What is the main tenet of the lock-and-key model for drug activity?

A.There is a connection between molecular structure and its biological effect.

B.Only certain biological keys can unlock the potential of a drug.

C.The key to a drug's success is to keep it locked away from stomach acid.

D.The biological lock of an enzyme can be activated by using certain chemical keys.

E.All of these

Question 125

Would formulating a sulfa drug with PABA be likely to increase or decrease its antibacterial properties?

A.There would likely be an increase in antibacterial properties due to the synergistic effect of these two agents working together.

B.A sulfa drug and PABA combine in the body to form highly active forms of penicillin, which is a powerful antibiotic.

C.No, but the combination would prove effective against viruses.

D.There would likely be a decrease in antibacterial properties because a sulfa drug works by competing with PABA

Question 126

Chemotherapy is used to treat ________.

A.cancer

B.bacterial infections

C.viral infections

D.All of these

Explanation / Answer

122) C

123) D

124) D

125) D

126) A

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