Respiration-The human body is made up of cells. The cells perform various activities such as nutrition, excretion, transport, and reproduction. They require energy to carry out these processes. This energy is provided by the food we eat.
The food has energy stored in it. This energy is liberated during respiration. The air we inhale contains oxygen. It is transported to different parts of the body and finally the cells. The oxygen in the cells assists in disintegrating the food. Consequently, energy is released. This process is known as cellular respiration.
The food is disintegrated in the cells into water and carbon dioxide with the help of oxygen. This process of breakdown of food in the presence of oxygen is known as aerobic respiration. When the food is disintegrated without the use of oxygen, it is known as anaerobic respiration. Energy is released upon the break down of food.Respiration transforms energy stored in foods eaten by organism into energy that can be used for metabolic processes that sustain organism’s life.
Importance of the respiratory system is critical. Organisms can endure many days without food but cannot survive for more than few minutes if respiration.
Breathing- Breathing is the process of moving air out and in the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen. All aerobic creatures need oxygen for cellular respiration, which uses the oxygen to break down foods for energy and produces carbon dioxide as a waste product. Breathing, or external respiration brings air into the lungs where gas exchange takes place in the alveoli through diffusion. The body’s circulatory system transports these gases to and from the cells, where “cellular respiration” takes place. Breathing has other important functions. It provides a mechanism for speech, laughter and similar expressions of the emotions. It is also used for reflexes such as yawning, coughing and sneezing. Animals that cannot thermoregulate by perspiration, because they lack sufficient sweat glands, may lose heat by evaporation through panting.