2. Epinephrine is a drug that______ a. chronotropic, but not inotropic b. inotro

Question

2. Epinephrine is a drug that______

a. chronotropic, but not inotropic

b. inotropic but not chronotropic

c. both chronotropic and inotropic

d. neither chronotropic and inotropic

3. Acetylcoline is a drug that ______

a. is a chronotropic, because it causes an increase in heart rate

b. is isotropic, because it causes an increase in heart rate

c. blocks the effect of atropine

d. none of the above

5. The type of transducer used to monitor her movements during the cardiac cycle while administering chemicals to the surface of the heart was the ______

a.electrocardiograph

b.myograph

c.pneumograph

d.steffi Graf

Explanation / Answer

2. Chronotropic Agents

The are the chemical agents, drugs or endogenous substances that affect the heart rate. They are further divided into two types:

a. Positive chronotropic agents

They tend to increase the heart rate by accelerating the rate of impulse formation in SA node.

b. Negative chronotropic agents

They tend to decrease the heart rate by decrease the impulse formation.

Inotropic agents

These are the agents that affect the force of cardiac contraction. They are further divided in two types:

Positive inotropic agents:

They increase the force of cardiac contraction.

Negative inotropic agents:

They decrease the force of cardiac contraction.

Epinephrine binds to beta 1 receptors located on heart and increase heart rate as well as cardiac contractility hence showing both positive chronotropic and positive inotropic effects. Therefore the correct answer is:

C. both chronotropic and inotropic

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