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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Blood pressure is highest in the _______ and lowest in the ________.

  1. a. arteries; veins
  2. b. arterioles; venules
  3. c. veins; arteries
  4. d. capillaries; arterioles

Summary Introduction

Concept introduction: The pressure exerted by the blood during circulation is called blood pressure.  The stretching of blood vessels in response to heart contraction is very important to maintain the blood flow through the vascular system. It is very essential that a normal pressure has to be maintained by the blood vessels, as it significantly influences the health condition of an individual.

Explanation

Reason for the correct answer: The blood pressure is usually measured as systolic and diastolic pressure. Most commonly, the region near the brachial artery is used to measure the blood pressure for the highest accuracy. The force exerted by blood on the arterial walls as the heart contracts is known as systolic pressure. It will be the highest value, as it is very necessary to pump the blood to peripheral organs and tissues. As the heart dilates, the impure blood in the different body parts are collected by veins and it flows to the right atrium at a low pressure. The normal range of the systolic pressure is between 100 and 140 mmHg. The pressure exerted on the arteries during heart relaxation is called as the diastolic pressure. Its normal range is 60 to 100 mmHg.

Option a. is given as “arteries; veins”. The blood pressure in the arteries will be at the highest and it will be the lowest in the veins. Therefore, option a. is the correct answer.

Reason for the incorrect answers:

Option b. is given as “arterioles; venules”. A venule is formed by the fusion of several capillaries that carry blood to a vein, while an arteriole is formed by branching out an artery to several capillaries...

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