Chapter 11: The Cardiovascular System Exercise 1. True-False. Indicate whether e

Question

Chapter 11: The Cardiovascular System Exercise 1. True-False. Indicate whether each of the following statements is true or false by circling+ if true and O if false. If the statement is false correct it in the space provided +O 1. Cells in each area of the myocardial conduction system have their own rate the inherent rhythm of the AV node determines a healthy individual's resting heart rate. + O 2. The events diagrammed in the electrocardiogram (ECG) precede contraction of the respective atrial and ventricular myocardial cells +03. Stroke volume increases during exercise because of an increase in end- diastolic ventricular volume and an increase in end-systolic ventricular volume. According to the Frank-Starling law, stroke volume increases as the amount of blood returned to the heart increases. + 0 4.

Explanation / Answer

1. False,

The inherent rhythm of the SA node determines a healthy individual’s resting heart rate.

2. True

3. False,

Exercise increases stroke volume, which frequently results in a lower (resting) heart rate. Reduced heart rate prolongs ventricular diastole (filling), increasing end-diastolic volume, and ultimately allowing more blood to be ejected.

4. False,

The law states that the stroke volume of the heart increases in response to an increase in the volume of blood in the ventricles, before contraction (the end-diastolic volume), when all other factors remain constant.

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