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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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The systemic circuit of mammals _______.

  1. a. carries blood to the lungs and back
  2. b. is shorter than the pulmonary circuit
  3. c. carries blood to body tissues and back
  4. d. allows oxygenated and oxygen-poor blood to mix

Summary Introduction

Concept introduction: To sustain life, the blood must circulate all along the body. It transports oxygen and all other essential nutrients to different parts of the body. There are two major circulation pathways namely systemic and pulmonary circulation. In systemic pathway, oxygenated blood from lungs entering into the left atria is carried to the left ventricle. From the left ventricle, the oxygenated blood gets pumped into the aorta. Many arteries arising from the aortal vessel transport this oxygenated blood into different parts of the body. In pulmonary pathway, it starts from the collection of deoxygenated blood from different body parts by veins and pours it into the right atrium to filling oxygenated blood to the left atria.

Explanation

Reason for correct answer: Systemic circulation is one of the main pathways of blood circulation in mammals. During this, oxygenated blood entering from the lungs to the left atria is pumped into the left ventricle through a bicuspid valve. From the left ventricle, blood is pumped out into the aorta through an aortal valve from which arises many small arteries that carry this oxygenated blood into different tissues and organs. It is the blood circulating by the systemic pathway that provides all the essential nutrients and oxygen to the body tissues.

Option c. is given as “carries blood to body tissues and back”.

Since systemic circuit is the only pathway by which oxygenated blood is transported into different body tissues, option c. is the correct answer.

Reasons for incorrect answers:

Option a. is given as “carries blood to the lungs and back”...

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