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The Circulatory System Notes
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  • Course
  • Biology
  • Institution
  • 9th Grade

These painstakingly written notes offer a comprehensive analysis of the circulatory system, providing in-depth understanding of its composition and essential operations. The functions of the heart, blood veins, and blood components are covered in detail in each area, along with how they interact to...

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Document information

  • July 23, 2024
  • 3
  • 2023/2024
  • Class notes
  • Jonah wilfred
  • All classes

Subjects

  • biology
  • circulatory system
  • heart valves
  • wall and layers
  • functions
  • pumping blood
  • blood vessels
  • arteries
  • capillaries
  • electrical conduction system

Written for

  • Secondary school
  • 9th Grade
  • Biology
  • 1
All documents for this subject (19)

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Available practice questions

The Circulatory System Flashcards

Flashcards 25 Flashcards
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Flashcards 25 Flashcards
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Some examples from this set of practice questions

1.

What is the primary function of the circulatory system?

Answer: To distribute hormones, oxygen, nutrients, and blood throughout the body.

2.

What are the upper chambers of the heart called?

Answer: Atria (singular: atrium).

3.

What is the function of the right atrium?

Answer: To receive deoxygenated blood from the body through the superior and inferior vena cava.

4.

What is the function of the left atrium?

Answer: To receive oxygenated blood from the lungs through the pulmonary veins.

5.

What are the lower chambers of the heart called?

Answer: Ventricles.

6.

What does the right ventricle do?

Answer: Pumps deoxygenated blood to the lungs via the pulmonary artery.

7.

What does the left ventricle do?

Answer: Pumps oxygenated blood to the rest of the body through the aorta and has the thickest walls to generate sufficient force.

8.

What is the function of the tricuspid valve?

Answer: It prevents the backflow of blood into the right atrium when the right ventricle contracts.

9.

What is the function of the pulmonary valve?

Answer: It prevents the backflow of blood into the right ventricle after it has been pumped to the lungs.

10.

What is the function of the mitral valve?

Answer: It prevents the backflow of blood into the left atrium when the left ventricle contracts.

Content preview

The Circulatory System
~Notes~

1. What is the Circulatory System?:
The cardiovascular system, sometimes referred to as the circulatory system, is in charge of distributing
hormones, oxygen, nutrients, and blood throughout the body. It is comprised of blood, blood arteries,
and the heart.

Fun Fact: Your heart pumps around 5 liters (1.3 gallons) of blood every minute, which is about 7,200
liters (1,900 gallons) a day!

Structure:
Chambers~

● Atria (Singular: Atrium): The upper chambers of the heart. There are two atria – the right
atrium and the left atrium.
○ Right Atrium: Receives deoxygenated blood from the body through the superior and
inferior vena cava.
○ Left Atrium: Receives oxygenated blood from the lungs through the pulmonary veins.
● Ventricles: The lower chambers of the heart. There are two ventricles – the right ventricle and
the left ventricle.
○ Right Ventricle: Pumps deoxygenated blood to the lungs via the pulmonary artery.
○ Left Ventricle: Pumps oxygenated blood to the rest of the body via the aorta. The left
ventricle has the thickest walls to generate enough force to pump blood throughout
the body.

Heart Valves~

● Tricuspid Valve: Located between the right atrium and right ventricle. It prevents the backflow
of blood into the right atrium when the right ventricle contracts.
● Pulmonary Valve: Located between the right ventricle and the pulmonary artery. It prevents
the backflow of blood into the right ventricle after it has been pumped to the lungs.
● Mitral Valve: Also known as the bicuspid valve, located between the left atrium and left
ventricle. It prevents the backflow of blood into the left atrium when the left ventricle
contracts.
● Aortic Valve: Located between the left ventricle and the aorta. It prevents the backflow of
blood into the left ventricle after it has been pumped into the aorta.

Walls and Layers~

● Endocardium: The deepest layer, which covers the heart's valves and lines the chambers.

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