Imp Questions For All Chapters – General Science Class 7
The Muscular System and Digestive System in Human Beings
Short Questions
1. What is an organ system?
→ An organ system is a group of organs that work together to perform a specific function.
2. How are muscles attached to bones?
→ Muscles are attached to bones by tendons, which help in movement.
3. What are voluntary muscles?
→ Voluntary muscles are muscles that move under our control, like muscles in arms and legs.
4. What are involuntary muscles?
→ Involuntary muscles move automatically, like heart muscles and stomach muscles.
5. How many muscles are there in the human body?
→ There are more than 600 muscles in the human body.
6. Which muscle is called the “suicide bag” of the cell?
→ The lysosome is known as the suicide bag of the cell.
7. Which muscles control heart movements?
→ The cardiac muscles control heart movements.
8. Which muscle is the largest in the human body?
→ The thigh muscle is the largest muscle in the human body.
9. What is the function of smooth muscles?
→ Smooth muscles help in movements of internal organs like stomach and intestines.
10. What is digestion?
→ Digestion is the process of breaking down food into a soluble form for absorption into the blood.
11. What are the main parts of the digestive system?
→ The main parts are the mouth, pharynx, oesophagus, stomach, small intestine, large intestine, rectum, and anus.
12. Which glands help in digestion?
→ The salivary glands, liver, and pancreas help in digestion.
13. What is the function of saliva?
→ Saliva contains an enzyme ptyalin, which breaks down starch into sugar.
14. Where does most digestion occur?
→ Most digestion occurs in the small intestine.
15. Which organ stores bile?
→ The gall bladder stores bile, which helps in digestion of fats.
Long Questions
1. How do muscles help in movement?
→ Muscles are attached to bones by tendons. When they contract and relax, they pull the bones, allowing movement.
2. What happens when cardiac muscles stop working?
→ If cardiac muscles stop working, the heart stops pumping blood, leading to organ failure and death.
3. Why should we exercise regularly?
→ Regular exercise keeps muscles strong and flexible, improves blood circulation, and prevents obesity and heart diseases.
4. What is the function of the stomach in digestion?
→ The stomach stores and churns food, mixing it with gastric juice, which contains acid and enzymes to digest proteins.
5. What is the function of the large intestine?
→ The large intestine absorbs water from undigested food and removes solid waste from the body through the anus.
6. Why is it important to chew food properly?
→ Chewing breaks food into smaller pieces, making it easier for enzymes to act and improving digestion and nutrient absorption.
7. How does the liver help in digestion?
→ The liver produces bile, which helps in breaking down fats into smaller particles for easy digestion.
8. What are the harmful effects of tobacco and alcohol on the digestive system?
→ Tobacco and alcohol damage the liver, stomach, and intestines, leading to ulcers, liver disease, and digestive problems.
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