Breathing
NCERT Notes Class 11 Biology Chapter 14 – Breathing and Exchange of Gases
Notes for NCERT Class 11 Biology Chapter 14 Breathing and Exchange of Gases: Breathing (ventilation) is a process of moving air into and from the lungs so that the exchange of gases can be taken place with the internal environment. The main purpose is to expel carbon dioxide and take in oxygen. Respiration is a process in which the cells of an organism get energy by the oxidation or burning of the glucose molecules when we inhale oxygen from the air. The liberated energy is used up by our body to perform some functions like muscle contraction, nerve impulse transmission, protein synthesis, etc. There are some organs involved in these processes which perform specific functions.
Class 11 Biology Chapter 14 Breathing and Exchange of Gases: Explains the respiratory system is the network of many organs which help in breathing. It comprises the airways, lungs and blood vessels. These work together to transport oxygen throughout the body and clean out the waste gases like carbon dioxide. The respiratory system performs many functions. It helps to inhale (breathe in) and exhale (breathe out), allows us to talk and to smell. It also helps to deliver oxygen to the cells, warms up the air according to the body’s temperature and moisturises it to the humidity level according to the need. Removal of gases waste, including carbon dioxide, is another job, it performs. Some conditions may affect the organs and tissues of the respiratory system. Some may be developed due to the irritants we inhale from the air, including viruses or bacteria which cause infection.