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CBSE Class 7  >  Class 7 Notes  >  Science (Old NCERT)  >  PPT: The Circulatory System

PPT: The Circulatory System | Science Class 7 (Old NCERT) PDF Download

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 Page 1


T H E
C I R C U L A T O R Y
S Y S T E M
The role of the heart, blood
and blood vessels
Page 2


T H E
C I R C U L A T O R Y
S Y S T E M
The role of the heart, blood
and blood vessels
Name and describe the
main parts of the human
circulatory system.
Describe the role of the
heart, blood and blood
vessels.
TODAY, YOU WILL...
Page 3


T H E
C I R C U L A T O R Y
S Y S T E M
The role of the heart, blood
and blood vessels
Name and describe the
main parts of the human
circulatory system.
Describe the role of the
heart, blood and blood
vessels.
TODAY, YOU WILL...
Function
To transport blood,
oxygen and nutrients to
the body
Main Parts
Has three main parts: the
heart, blood vessels and
blood
THE HUMAN
CIRCULATORY SYSTEM
Page 4


T H E
C I R C U L A T O R Y
S Y S T E M
The role of the heart, blood
and blood vessels
Name and describe the
main parts of the human
circulatory system.
Describe the role of the
heart, blood and blood
vessels.
TODAY, YOU WILL...
Function
To transport blood,
oxygen and nutrients to
the body
Main Parts
Has three main parts: the
heart, blood vessels and
blood
THE HUMAN
CIRCULATORY SYSTEM
It works as a pump to move the
blood around the body. 
It has four chambers—two atria
(upper chambers) and two
ventricles (lower chambers).
THE HEART
right atrium
left atrium
right ventricle
left ventricle
Page 5


T H E
C I R C U L A T O R Y
S Y S T E M
The role of the heart, blood
and blood vessels
Name and describe the
main parts of the human
circulatory system.
Describe the role of the
heart, blood and blood
vessels.
TODAY, YOU WILL...
Function
To transport blood,
oxygen and nutrients to
the body
Main Parts
Has three main parts: the
heart, blood vessels and
blood
THE HUMAN
CIRCULATORY SYSTEM
It works as a pump to move the
blood around the body. 
It has four chambers—two atria
(upper chambers) and two
ventricles (lower chambers).
THE HEART
right atrium
left atrium
right ventricle
left ventricle
Let’s examine how blood flows through the heart.
THE HEART
The right atrium takes in blood
carrying carbon dioxide.
Blood is squeezed down into the
right ventricle and taken to the
lungs, where oxygen replaces
carbon dioxide.
1
2
from upper
body
to left
lung
1
2
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FAQs on PPT: The Circulatory System

1. How does the heart pump blood through the circulatory system in Class 7 Science?
Ans. The heart contracts and relaxes rhythmically to pump blood in two stages: the right side receives deoxygenated blood from the body and sends it to the lungs, while the left side receives oxygenated blood from the lungs and pumps it throughout the body. This continuous cycle ensures oxygen reaches all body tissues through arteries, capillaries, and veins.
2. What's the difference between arteries, veins, and capillaries in the circulatory system?
Ans. Arteries carry oxygenated blood away from the heart under high pressure with thick, elastic walls. Veins return deoxygenated blood to the heart with thinner walls and contain valves. Capillaries are tiny vessels that exchange oxygen, nutrients, and waste between blood and body cells. Understanding these vessel types is essential for CBSE Class 7 circulatory system concepts.
3. Why do we need both pulmonary and systemic circulation?
Ans. Pulmonary circulation carries deoxygenated blood from the heart to the lungs for oxygenation, while systemic circulation distributes this oxygen-rich blood to body tissues and returns waste-laden blood. This dual-circuit system ensures the body receives continuous oxygen supply and wastes are efficiently removed for elimination.
4. What happens to blood pressure as it moves through different parts of the circulatory system?
Ans. Blood pressure is highest in arteries leaving the heart, gradually decreases in capillaries where gas exchange occurs, and becomes lowest in veins returning to the heart. This pressure gradient ensures blood flows efficiently through vessels and allows nutrients and oxygen to diffuse into tissues effectively during circulation.
5. How do valves in the heart and veins prevent backflow of blood?
Ans. Valves act as one-way doors that open to allow blood flow in one direction and close to prevent backward movement. In the heart, atrioventricular and semilunar valves ensure blood moves from atria to ventricles and then to arteries. Venous valves similarly maintain unidirectional flow back to the heart against gravity, maintaining healthy circulatory function throughout the body.
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May 16, 2026 Last updated
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Document Description: PPT: The Circulatory System for Class 7 2026 is part of Science Class 7 (Old NCERT) preparation. The notes and questions for PPT: The Circulatory System have been prepared according to the Class 7 exam syllabus. Information about PPT: The Circulatory System covers topics like and PPT: The Circulatory System Example, for Class 7 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: The Circulatory System.
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