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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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Contraction of the _________ drives blood out into the aorta and through the systemic circuit.

  1. a. left atrium
  2. b. left ventricle
  3. c. right atrium
  4. d. right ventricle

Summary Introduction

Concept introduction: Based on the functions, blood vessels inside the body are mainly classified into two branches namely systemic and pulmonary circuits. A systemic circulation is one of the major parts of the cardiovascular system in which oxygenated blood from the heart is transported to different body parts and it also carries deoxygenated blood from different body parts to the heart. In pulmonary circulation, oxygen-poor blood from the right ventricle is transported to the lungs. Then it returns the oxygenated blood to the left atrium.

Explanation

Reason for correct answer: During systemic circuit, it starts from the contraction of the left atria that relieves oxygenated blood into the left ventricle through bicuspid valve existing between the two chambers. Then, the blood in the left ventricle gets pumped into the aorta through the aortic valve, which then moves into different parts of the body for the supply of nutrients and oxygen.

Option b. is given as “left ventricle”. During systemic circulation, oxygenated blood in the left atrium gets pumped into the left ventricle, which then pumped out to the aorta. Therefore, option b. is the correct answer.

Reason for incorrect answer:

Option a. is given as “left atrium”. During systemic circulation, oxygenated blood from the right atria will be pumped into the left ventricle, which then is pumped out into the aorta...

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