NCERT Class 9 Physical Education Important Chapter 6 Cardiorespiratory System 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 6 Cardiorespiratory System 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 6 Cardiorespiratory System
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Cardiorespiratory System
Chapter: 6
| Unit – 2 Science and Sports |
| IMPORTANT QUESTION AND ANSWER |
Short Question Answer:
1. What is breathing (ventilation)?
Ans: Breathing is the physical act of inhaling oxygen and exhaling carbon dioxide, which involves your lungs, chest muscles, and diaphragm.
2. What is the primary muscle responsible for normal, quiet breathing?
Ans: The diaphragm is the primary muscle that does most of the work during normal, quiet breathing.
3. Where does cellular respiration take place, and what does it produce?
Ans: Cellular respiration takes place inside the mitochondria of each cell, where oxygen is used to break down glucose and release energy in the form of ATP.
4. How does the human heart function as two pumps?
Ans: The right side of the heart pumps oxygen-deficient blood to the lungs, while the left side pumps oxygen-rich blood to the rest of the body.
5. What is the function of capillaries in the circulatory system?
Ans: Capillaries are tiny blood vessels with thin walls where the exchange of nutrients, waste products, and gases happens between the blood and the fluid around the cells.
6. What causes the normal “lub-dub” sound of the heart?
Ans: The “lub” sound is caused by the closing of the mitral and tricuspid valves, and the “dub” sound is caused by the closing of the aortic and pulmonary valves.
7. What is systolic blood pressure?
Ans: Systolic blood pressure is the pressure created when the heart contracts and pushes blood out into the arteries.
8. By how much does blood flow to active muscles increase during intense exercise?
Ans: During intense exercise, blood flow to the active muscles increases by 15 to 25 times compared to when the body is at rest.
9. What is the normal resting heart rate for an average adult?
Ans: A normal resting heart rate for adults is 70 to 80 beats per minute, though trained athletes can have a resting heart rate as low as 40 to 50 beats per minute.
10. What is the immediate effect of exercise on the human heart?
Ans: The immediate effect of exercise on the heart is that it beats faster and pumps more blood to meet the body’s increased demand for oxygen and nutrients.
Long Question-Answers:
1. Explain the mechanism of breathing during normal respiration and heavy exercise.
Ans: During normal breathing, the diaphragm contracts and moves downward to make the chest cavity larger, allowing the lungs to expand and pull air in (inspiration). When you breathe out, the diaphragm relaxes and the natural recoil of the chest pushes the air out. However, during heavy breathing, these natural elastic forces are not strong enough for quick exhalation. In this case, the abdominal muscles help by squeezing the abdominal organs upward against the diaphragm to force more air out of the lungs quickly.
2. Differentiate between external respiration, internal respiration, and cellular respiration.
Ans: External respiration is the gas exchange that occurs in the lungs, where oxygen moves from the alveoli into the blood, and carbon dioxide moves from the blood into the alveoli to be exhaled. Internal respiration is the exchange that happens in the tissues, where oxygen moves from the blood into the body’s cells, and carbon dioxide moves from the cells back into the blood. Cellular respiration is the final chemical process inside the cell’s mitochondria, where oxygen breaks down glucose to release usable energy (ATP) while producing carbon dioxide and water as waste products.
3. Describe the complete circuit of blood circulation in the human body.
Ans: The human body has a double circulatory system. The left side of the heart contracts and pumps oxygen-rich blood into the systemic circulation through the aorta, which branches into arteries, arterioles, and capillaries to deliver oxygen to tissues. The oxygen-deficient blood then flows into venules and larger veins to return to the right side of the heart. The right side then pumps this blood into the pulmonary circulation (lungs) via the pulmonary artery, where carbon dioxide is removed and oxygen is added. Finally, the oxygen-rich blood returns to the left atrium and ventricle, completing the circuit.
4. Explain the roles of the different types of blood vessels in the circulatory system.
Ans: The circulatory system relies on various blood vessels. Arteries carry blood under high pressure from the heart to the tissues and have strong walls for fast blood flow. Arterioles are small branches of arteries that control how much blood enters the capillaries by constricting or dilating. Capillaries are extremely thin-walled vessels that allow the actual exchange of gases, nutrients, and waste between the blood and cells. Venules collect the deoxygenated blood from the capillaries and join to form Veins, which carry the blood back to the heart under low pressure and also act as blood storage reservoirs.
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