NCERT Class 9 Physical Education Important Chapter 5 Understanding Our Body Solutions English Medium As Per New Syllabus. to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 9 Physical Education Important Chapter 5 Understanding Our Body Notes and select need one. NCERT Class 9 Physical Education Additional Question Answers Download PDF. NCERT Class 9 Physical Education And Well – Being Important Solutions.
NCERT Class 9 Physical Education Important Chapter 5 Understanding Our Body
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 9 Physical Education Additional Solutions are part of All Subject Solutions. Here we have given NCERT Class 9 Physical Education Important Notes, CBSE Class 9 Physical Education Additional Notes for All Chapters, You can practice these here.
Understanding Our Body
Chapter: 5
| Unit – 2 Science and Sports |
| IMPORTANT QUESTION AND ANSWER |
Short Question Answer:
1. What is human anatomy?
Ans: Human anatomy is the scientific study of the structure of the human body, focusing on what the body parts are and where they are located.
2. What is a tendon?
Ans: A tendon is a tough, flexible band of tissue that attaches muscles to bones, allowing your limbs to move and absorbing impact during activities.
3. What is the function of ligaments in the body?
Ans: Ligaments are strong, fibrous bands of connective tissue that link bones to one another to maintain skeletal integrity and stabilise joints.
4. How does cartilage protect the bones?
Ans: Cartilage is a tough yet flexible connective tissue found at the ends of bones that absorbs shock and minimises friction to keep bones from grinding against each other.
5. What are synovial joints?
Ans: Synovial joints are freely movable joints that feature a fluid-filled cavity covered by a synovial membrane between the connecting bones.
6. Why are skeletal muscles known as voluntary muscles?
Ans: They are called voluntary muscles because they are consciously controlled by the individual to allow movement and maintain body posture.
7. Where are smooth muscles located?
Ans: Smooth muscles are found in the walls of hollow internal organs such as the stomach, blood vessels, and intestines.
8. What makes cardiac muscles unique?
Ans: Cardiac muscles are found exclusively in the walls of the heart and possess self-stimulating properties that enable the heart to continuously pump blood.
9. What does ‘flexion’ mean in terms of joint movement?
Ans: Flexion refers to the bending of a joint, which reduces the angle between the bones, such as when you bend your elbow.
10. What is an isometric muscle contraction?
Ans: In an isometric contraction, the muscle contracts to generate force but does not change its length, similar to when you hold a plank or push against a wall.
Long Question Answer:
1. Explain the different types of freely moveable (synovial) joints found in the human body with examples.
Ans: Freely moveable or synovial joints are characterised by a fluid-filled cavity covered by a synovial membrane that separates the connecting bones. This structure allows for a wide range of motion crucial for activities like walking, running, and grasping.
They are classified into several types:
(i) Ball and Socket Joints: These allow movement in all directions. Examples include the hip and shoulder joints.
(ii) Hinge Joints: These allow movements of flexion (bending) and extension (straightening) only. Examples include the knee and elbow joints.
(iii) Pivot Joints: These allow rotational movement. Examples include the atlanto-axial joint in the neck and the radio-ulnar joint in the forearm.
(iv) Condyloid, Gliding, and Saddle Joints: Condyloid joints are found between the radius and carpal bones of the wrist, gliding joints are between the tarsal bones in the foot, and saddle joints are located between the trapezium and the 1st metacarpal bone in the hand.
2. Describe the mechanism of breathing and differentiate between external, internal, and cellular respiration.
Ans: Breathing (ventilation) is the physical act of inhaling oxygen and exhaling carbon dioxide. During inhalation, the diaphragm contracts and moves downward, expanding the chest cavity and allowing the lungs to fill with air. During exhalation, the diaphragm relaxes, and the natural recoil of the chest pushes air out.
Respiration, however, happens in three deeper stages:
(i) External Respiration: Occurs in the lungs where oxygen from inhaled air moves into the bloodstream, and carbon dioxide moves from the blood into the lungs to be exhaled.
(ii) Internal Respiration: Occurs in the body’s tissues where oxygen moves from the circulating blood into the cells, and cellular carbon dioxide waste moves into the blood.
(iii) Cellular Respiration: Happens inside the mitochondria of the cells, where oxygen is used to break down glucose to release energy (ATP) needed for muscle movement and bodily functions, producing carbon dioxide and water as waste.
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