"तब याद तुम्हारी आती है" कविता के कवि कौन हैं?

रामनरेश त्रिपाठी

कविता में कवि को किसकी याद आती है?

सिरजनहार (ईश्वर) की

"सिरजनहार" शब्द का क्या अर्थ है?

सृष्टि की रचना करने वाला ईश्वर

सवेरे किन दृश्यों से कवि को प्रभु की याद आती है?

चिड़ियों के गीत, खिलती कलियाँ और ठंडी हवा से

रात के समय कौन-से दृश्य कवि को प्रभावित करते हैं?

चमकते तारे और शान से उठता चाँद

What is the difference between anatomy and physiology?

Anatomy is the study of the body's structure — its bones, muscles and organs — while physiology is the study of how those parts function, especially during physical activity.

What are the main functions of the skeletal system in sport?

The skeleton gives the body its frame and shape, protects vital organs, and provides attachment points for muscles so that movement can take place.

How are joints classified?

Joints are classified by how much they move — some are freely movable (like the ball-and-socket joint of the shoulder and the hinge joint of the knee), while others allow little or no movement.

What role does the muscular system play in movement?

Muscles contract to pull on bones, producing the force and power needed for movement; this is how the body generates strength during sports.

What does the cardiovascular system do during exercise?

The heart pumps faster to circulate more blood, delivering extra oxygen and nutrients to working muscles and carrying away waste products.

Explain cellular respiration in simple terms.

Cellular respiration is the process by which cells release energy from food using oxygen; this energy powers muscle contraction and all physical activity.

How do levers in the body help in movement?

Bones act as rigid bars, joints act as pivots and muscles supply the force, so together they form levers — like simple machines — that produce strength, power and efficient movement.

Why are warm-up and cool-down exercises important?

A warm-up prepares the muscles, heart and joints for activity and reduces injury risk, while a cool-down helps the body return gradually to rest and aids recovery.

What is the difference between short-term and long-term effects of exercise?

Short-term effects appear immediately — faster heartbeat, quicker breathing, sweating — while long-term effects develop over time, such as a stronger heart, greater stamina and stronger muscles and bones.

Why should students observe their own actions like kicking or throwing a ball?

Observing real actions helps students connect theory with practice by identifying which muscles and joints are involved, deepening their understanding of how the body moves.

Science and Sports

Class 9 Physical Education · Khel Praveen · Chapter 2

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Summary

This unit looks at sport through the lens of science, explaining how the human body works during movement and how that knowledge helps us train smarter and stay healthy. It introduces anatomy (the structure of the body) and physiology (how it functions), then surveys the systems that power activity: the skeletal system of bones that gives the body its frame and protects organs; the muscular system that produces force and movement; and joints, which are classified by how much they move (for example, the freely moving ball-and-socket and hinge joints). It explains the cardiovascular system — the heart, blood and vessels that circulate oxygen and nutrients — and the respiratory system, including how breathing supplies oxygen for cellular respiration, the process by which cells release energy from food. The unit also introduces the idea of levers in the body, showing how bones, joints and muscles act together like simple machines to generate strength and power. Students are encouraged to observe their own actions — kicking or throwing a ball — to identify the muscles and joints involved. Finally it compares the short-term and long-term effects of exercise on the body and stresses the importance of proper warm-up, cool-down and breathing, so that training is both effective and safe.

Anatomy and physiology of the bodyBones, muscles and jointsCardiovascular and respiratory systemsCellular respiration and energyLevers in the body and effects of exercise

Key terms

Anatomy

The study of the structure of the body — its bones, muscles, organs and how they are arranged.

Physiology

The study of how the body and its systems function, especially during movement and exercise.

Joint

The point where two or more bones meet; joints are classified by how much movement they allow.

Cardiovascular system

The heart, blood and blood vessels that circulate oxygen and nutrients around the body.

Cellular respiration

The process by which body cells release energy from food, using oxygen, to power activity.

Lever

A bone-joint-muscle arrangement that acts like a simple machine to produce force and movement.

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Science and Sports

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