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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Hydrostatic pressure is best described as:

a. the uncoordinated contractions that occur during heartattacks.

b. a premature ventricular contraction that signifies a skippedbeat.

c. a high point of pressure called diastolic blood pressure.

d. an arterial vasodilation caused by carbon dioxide.

e. the pressure of blood on the walls of arteries.

Summary Introduction

Introduction:

The cardiac cycle consists of two phases that are the diastole phase and the systole phase. Contraction of heart takes place in response to the action potential that spreads to other cells causing a heartbeat. Mammals contain sinoatrial (SA) node and atrioventricular (AV) node that controls cardiac contractions.

Explanation

Justification/explanation for the correct answer:

Option (e) is, the pressure of blood on the walls of arteries. Hydrostatic pressure is the pressure exerted by blood in the vessels against the wall of vessels. The measure of this hydrostatic pressure on the wall of arteries, when blood gets pumped, gives blood pressure. Hence, option (e) is correct.

The explanation for the incorrect answers:

Option (a) is, the uncoordinated contractions that occur during heart attacks. This type of heart condition is called atrial fibrillation where the uncoordinated electrical signals cause irregular heart rate that results in a heart attack. The uncoordinated signals increase the heart rate. So, it is an incorrect option.

Option (b) is, a premature ventricular contraction (PAC) that signifies a skipped beat. PAC is caused by extra heartbeats occurring in ventricles...

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