CBSE Class 6 General Knowledge

Unit 4: Science & Technology

Lesson: Human Body Systems

📘 Study Module: Human Body Systems

1. Introduction

The human body is a complex structure made up of different parts working together. These parts are organized into body systems. Each system performs specific functions essential for survival and healthy living.

2. Meaning of Human Body Systems

A human body system is a group of organs that work together to perform a particular function. All body systems are interrelated and depend on one another for proper functioning.

3. Major Human Body Systems

The major human body systems include:

• Skeletal System
• Muscular System
• Digestive System
• Respiratory System
• Circulatory System
• Nervous System
• Excretory System

Each system has a specific role in maintaining life.

4. Skeletal and Muscular Systems

The skeletal system gives shape and support to the body and protects internal organs. The muscular system helps in movement by working with the bones.

5. Digestive and Respiratory Systems

The digestive system breaks down food into nutrients needed by the body. The respiratory system helps in breathing by taking in oxygen and giving out carbon dioxide.

6. Circulatory and Nervous Systems

The circulatory system transports blood, oxygen, and nutrients throughout the body. The nervous system controls and coordinates all body activities.

7. Importance of Human Body Systems

Human body systems work together to keep the body healthy. If one system fails, others are affected. Proper care of the body helps all systems function well.

📝 Questions and Answers

A. Short Answer Questions

(One sentence each)

1. What is a human body system?
   Answer: A human body system is a group of organs working together to perform a specific function.
2. Name any one body system.
   Answer: The digestive system is one body system.
3. Which system gives shape to the body?
   Answer: The skeletal system gives shape to the body.
4. Which system helps in movement?
   Answer: The muscular system helps in movement.
5. What is the function of the digestive system?
   Answer: The digestive system breaks down food into nutrients.
6. Which system helps us breathe?
   Answer: The respiratory system helps us breathe.
7. What does the circulatory system transport?
   Answer: The circulatory system transports blood, oxygen, and nutrients.
8. Which system controls body activities?
   Answer: The nervous system controls body activities.
9. What is the function of the excretory system?
   Answer: The excretory system removes waste from the body.
10. Why are body systems important?
    Answer: Body systems are important because they keep the body functioning properly.

B. Long Answer Questions

(3–5 sentences each)

11. Explain the skeletal system.
    Answer: The skeletal system is made up of bones. It gives shape and support to the body. It protects internal organs like the brain and heart. It also helps in movement by working with muscles.
12. Describe the muscular system.
    Answer: The muscular system consists of muscles attached to bones. Muscles help in movement of body parts. They also help in posture and balance. Muscles work along with the skeletal system.
13. Explain the digestive system.
    Answer: The digestive system helps break down food into simple nutrients. These nutrients provide energy and help in growth. The digestive organs include the mouth, stomach, and intestines. Waste food is removed from the body.
14. Describe the respiratory system.
    Answer: The respiratory system helps us breathe. It takes in oxygen and releases carbon dioxide. Lungs are the main organs of this system. Oxygen is needed for energy production.
15. Explain the circulatory system.
    Answer: The circulatory system consists of the heart, blood, and blood vessels. It circulates blood throughout the body. It supplies oxygen and nutrients to cells. It also removes waste materials.
16. Write a short note on the nervous system.
    Answer: The nervous system controls and coordinates body activities. It includes the brain, spinal cord, and nerves. It sends messages to different parts of the body. It helps us respond to our surroundings.
17. What is the excretory system?
    Answer: The excretory system removes waste materials from the body. It includes organs like kidneys and urinary bladder. It helps maintain balance in the body. It keeps the blood clean.
18. How do body systems work together?
    Answer: Body systems depend on one another. For example, the respiratory system provides oxygen to the circulatory system. The digestive system provides nutrients. Together, they keep the body healthy.
19. Why is care of body systems important?
    Answer: Healthy body systems ensure proper functioning of the body. Poor habits can harm organs. Exercise, balanced diet, and hygiene help maintain body systems. Care helps prevent diseases.
20. How does the human body stay active?
    Answer: The body stays active through proper functioning of systems. Muscles help movement, lungs provide oxygen, and blood carries nutrients. All systems work together. This coordination keeps the body active.

🧠 Multiple Choice Questions (MCQs)

(With Answers and Detailed Explanations)

1. Which system gives shape to the body?
   a) Muscular
   b) Digestive
   c) Skeletal
   d) Respiratory
   Answer: c) Skeletal
   Explanation: Bones form the skeletal system which gives shape.
2. Which system helps in movement?
   a) Skeletal
   b) Muscular
   c) Nervous
   d) Excretory
   Answer: b) Muscular
   Explanation: Muscles help the body move.
3. Which system breaks down food?
   a) Circulatory
   b) Respiratory
   c) Digestive
   d) Nervous
   Answer: c) Digestive
   Explanation: The digestive system digests food.
4. Which system helps in breathing?
   a) Circulatory
   b) Respiratory
   c) Skeletal
   d) Muscular
   Answer: b) Respiratory
   Explanation: Breathing is the function of the respiratory system.
5. Which system controls body activities?
   a) Nervous
   b) Digestive
   c) Skeletal
   d) Excretory
   Answer: a) Nervous
   Explanation: The nervous system controls body actions.
6. Which organ pumps blood?
   a) Lungs
   b) Brain
   c) Heart
   d) Kidney
   Answer: c) Heart
   Explanation: The heart pumps blood.
7. Which system carries oxygen to all parts of the body?
   a) Digestive
   b) Nervous
   c) Circulatory
   d) Excretory
   Answer: c) Circulatory
   Explanation: Blood carries oxygen.
8. Which system removes waste?
   a) Digestive
   b) Respiratory
   c) Excretory
   d) Nervous
   Answer: c) Excretory
   Explanation: The excretory system removes waste.
9. Which system includes the brain?
   a) Muscular
   b) Nervous
   c) Skeletal
   d) Circulatory
   Answer: b) Nervous
   Explanation: The brain is part of the nervous system.
10. What helps bones move?
    a) Blood
    b) Nerves
    c) Muscles
    d) Lungs
    Answer: c) Muscles
    Explanation: Muscles move bones.
11. Which system helps in posture?
    a) Digestive
    b) Muscular
    c) Respiratory
    d) Excretory
    Answer: b) Muscular
    Explanation: Muscles maintain posture.
12. Which system supplies nutrients to cells?
    a) Circulatory
    b) Nervous
    c) Skeletal
    d) Respiratory
    Answer: a) Circulatory
    Explanation: Blood carries nutrients.
13. Which system helps in removing carbon dioxide?
    a) Digestive
    b) Circulatory
    c) Respiratory
    d) Skeletal
    Answer: c) Respiratory
    Explanation: The respiratory system removes CO₂.
14. Which organ is part of the excretory system?
    a) Heart
    b) Lungs
    c) Kidney
    d) Brain
    Answer: c) Kidney
    Explanation: Kidneys remove waste.
15. Which system protects internal organs?
    a) Skeletal
    b) Digestive
    c) Respiratory
    d) Nervous
    Answer: a) Skeletal
    Explanation: Bones protect organs.
16. Body systems work ______.
    a) separately
    b) independently
    c) together
    d) slowly
    Answer: c) together
    Explanation: All systems depend on one another.
17. Which system helps in thinking?
    a) Digestive
    b) Skeletal
    c) Nervous
    d) Muscular
    Answer: c) Nervous
    Explanation: Thinking is controlled by the nervous system.
18. Which system provides energy from food?
    a) Digestive
    b) Circulatory
    c) Skeletal
    d) Nervous
    Answer: a) Digestive
    Explanation: Digestion provides energy.
19. Which system removes liquid waste?
    a) Respiratory
    b) Excretory
    c) Digestive
    d) Muscular
    Answer: b) Excretory
    Explanation: The excretory system removes waste fluids.
20. Why are human body systems important?
    a) For appearance
    b) For games
    c) For survival
    d) For sleeping
    Answer: c) For survival
    Explanation: Body systems keep us alive.

✅ End of Lesson

Prepared strictly in accordance with the NCERT syllabus and CBSE Class 6 examination standards.