MEDICAL PHYSIOLOGY

PHYSIOLOGY

CARDIOVASCULAR PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

What type of effect is shown when there is a change in force of contraction of the cardiac muscle?

A	chronotropic
B	dromotropic
C	inotropic
D	bathmotropic

Explanation:

Detailed explanation-1: -There are 2 kinds of inotropes: positive inotropes and negative inotropes. Positive inotropes strengthen the force of the heartbeat. Negative inotropes weaken the force of the heartbeat.

Detailed explanation-2: -Inotropic – affects contractility. Chronotropic – affects heart rate (increase or decrease) Positive chronotropic drugs increase heart rate. Negative chronotropic drugs decrease the heart rate.

Detailed explanation-3: -Contractility describes the forcefulness of the heart’s contraction. Increasing contractility reduces end-systolic volume, which results in a greater stroke volume and thus greater cardiac output.

Detailed explanation-4: -Contractility describes the relative ability of the heart to eject a stroke volume (SV) at a given prevailing afterload (arterial pressure) and preload (end-diastolic volume; EDV).

There is 1 question to complete.