1. Distinguish between
a) Inspiration and Expiration
c) Respiration and Combustion
Answers
Answer:
first three images for a)
last pic for b)
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★ Question :
Distinguish between
a) Inspiration and Expiration
b) Respiration and Combustion
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★ Answer :
A) Inspiration and Expiration
➣ Inspiration
➠ It is an active process.
➠ Contraction of external intercostal muscles and relaxation of internal intercostal muscles occur.
➠ Rib cages move forward and outward.
➠ Diaphragm contracts and becomes flattened.
➠ Increase in volume of thoracic cavity.
➠ Air pressure in lungs is less than atmospheric pressure.
➠ Intake of air into lungs.
➣ Expiration
➠ It is a passive process.
➠ Relaxation of external intercostal muscles (muscles present between ribs) and contraction of internal intercostal muscles occur.
➠ Rib cages move downward and inward.
➠ Diaphragm relaxes and becomes original dome shaped.
➠ Decrease in volume of thoracic cavity.
➠ Air pressure in lungs is greater than atmospheric pressure.
➠ Expulsion of air from the lungs.
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B) Respiration and Combustion
➢ Respiration
➠ It occurs in living cells.
➠ Oxidation of food materials especially glucose to carbon dioxide and water is called respiration.
➠ Oxidation of sugar molecules occurs at the body temperature of an organism.
➠ The energy is released in several stages.
➠ Several intermediates are formed.
➠ Enzymes are required for oxidation.
➠ Respiration occurs in the presence of water.
➠ It is a controlled process.
➠ Energy is stored in ATP in the body.
➢ Combustion
➠ It is non- cellular.
➠ When sugar burns Co, and water are produced and energy is released as heat. This process is called combustion.
➠ Heat is to be applied for the sugar molecule to burn.
➠ The energy is released at once as heat.
➠ No intermediates are formed.
➠ Enzymes are not required for combustion.
➠ Combustion occurs in the absence of water.
➠ It is an uncontrolled process.
➠ Energy is not stored and is released into the atmosphere.