Define respiration.Name two types of respiration ?
Answers
Answer:
Respiration is the process of gas exchange between the air and an organism's cells. Three types of respiration include internal, external, and cellular respiration. External respiration is the breathing process. ... Aerobic respiration is a cellular respiration that requires oxygen while anaerobic respiration does not.
Explanation:
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☯Respiration
Respiration is the process by which energy is released from food.
☯Types of Respiration
Respiration consists of two processes.
- External respiration or breathing involves the exchange of two gases oxygen and carbon dioxide. Oxygen is taken in from the environment, and carbon dioxide and water vapour are sent out.
- Internal or cellular respiration involves the release of energy in cells. Carbon dioxide and water vapour are waste products commonly produced during this process.
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★EXTERNAL RESPIRATION
The main organs of respiration in humans are the lungs.
- Air is drawn into the nostrils during breathing. Dust particles and germs are trapped by the hair in the nostrils. The air is warmed by the blood circulating in the nose, and is made moist by the mucus in the nostrils.
- The clean, warm and moist air now passes through the pharynx into the windpipe or trachea, and then to the lungs through two smaller tubes called bronchi (singular: bronchus).
- Each bronchus enters a lung. The two - lungs are sponge-like sacs which fill most of the chest cavity. They are protected by the flexible ribcage. At the bottom of the chest cavity is a dome-shaped sheet of muscle called the diaphragm.
- In the lungs, the bronchi branch into smaller tubes known as bronchioles.
- The structure of the lungs enables gases to move rapidly between the air and blood. The lungs have a large surface area. lungs are composed of millions of tiny air sacs called alveoli (singular. alveolus), which are present at the end of the bronchioles.
- The alveoli are richly supplied with blood through a dense network of capillaries around them. They have very thin walls through which the exchange of gases between the air and blood takes place.
- nostrils → pharynx→ trachea →bronchi →bronchioles→alveoli.
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★CELLULAR RESPIRATION
◉Aerobic Respiration
The process by which organisms respire in the presence of oxygen is called aerobic respiration. This reaction releases a large amount of energy.
◉Anaerobic Respiration
Some organisms can release energy from glucose even in the absence of oxygen. The process by which organisms respire in the absence of oxygen is called anaerobic respiration.