SUKHRAM MEMORIAL PUBLIC SCHOOL
Class – 7th
Science assignment
hort answer based questions 2x4 = 8
Write the percentage of oxygen and carbon dioxide in inhaled and exhaled air.
What is meant by cellular respiration?
What is breathing rate? How is it counted?
What is diaphragm?
ong answer based questions 3x4 = 12
How the process of respiration takes place in insects?
Is respiration and breathing the same?
Why does an athlete breathe faster and deeper than usual after finishing the race?
t is said we should always breathe through our nose and not through mouth. Why?
am
Answers
Answer:
1) Inhaled air is by volume 79% nitrogen, 20.95% oxygen and small amounts of other gases including argon, carbon dioxide, neon, helium, and hydrogen. The gas exhaled is 4% to 5% by volume of carbon dioxide, about a 100 fold increase over the inhaled amount.
2) The process of cell catabolism in which cells turn food into usable energy in the form of ATP. In this process glucose is broken down in the presence of molecular oxygen into six molecules of carbon dioxide, and much of the energy released is preserved by turning ADP and free phosphate into ATP.
3) The respiration rate is the number of breaths a person takes per minute. The rate is usually measured when a person is at rest and simply involves counting the number of breaths for one minute by counting how many times the chest rises. Respiration rates may increase with fever, illness, and other medical conditions.
4)The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges.