Important Points and Formulas of class 7 Science Chapter-Respiration in Organisms

Important Points and Formulas of class 7 Science Chapter-Respiration in Organisms

May 19, 2022, 16:45 IST

Class 7 Science Chapter-Respiration in Organisms

Introduction

All living things need air (Oxygen) for their survival. Plants and animals need oxygen to release energy from their food. The energy stored in food molecules is released by their oxidation.

• The process which breaks down the food to release energy in the presence of oxygen and enzymes is called respiration.
• Breathing or external respiration: It is the process of inhaling fresh air (O ₂ ) and exhaling used air (CO ₂ ). It’s a mechanical process which involves pumping air in and out of the lungs.
• Cellular respiration: It is the chemical breakdown of glucose inside the cells.
• Aerobic Respiration: It is the process which involves the breakdown of glucose into CO ₂ and water inside the body cells in the presence of oxygen.

• Anaerobic Respiration: It is the process which involves the breakdown of glucose into CO₂ and ethyl alcohol in the absence of oxygen.

Respiration in Humans

Human respiratory tract involves the following:

• External nostrils: First part of respiratory system. It opens into nasal cavity and is meant for inhalation of air from outside.
• Nasal cavity: This cavity is separated from oral cavity by means of a hard and bony palate. It is lined by ciliated columnar epithelial cells that are rich in mucus, it brings about warmth, moistening and sterilization of air It contains hair and mucus which entrap the dust particles. Nasal cavity opens into it and it leads to pharynx.

Do solve questions given in the NCERT text book with the help of NCERT solutions for class 7 Science . If any students need to take the online test to check their concepts or undertstanding then they can visit Quiz for Respiration .

Find Below Shor​t Notes of chapter-Respiration in Organisms