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Internal respiration is..
  • A
    the exchange of carbon dioxide and oxygen in the lung.
  • B
    the process of inflating the lungs during mouth-to-mouth resuscitation.
  • C
    the term used for respiration inside the pressure cabin.
  • D
    a metabolic process inside the cells whereby oxygen is used and carbon dioxide produced.

INTERNAL AND EXTERNAL RESPIRATION

Internal and external respiration are two processes where the exchange of oxygen and carbon dioxide occur.

  • Internal Respiration: Internal respiration refers to the gas exchange between the blood capillaries and the tissue fluid around the cell. Oxygen diffuses out from the blood into tissue/cells during internal respiration. Carbon dioxide diffuses into the blood from the tissue during internal respiration.
  • External Respiration: External respiration refers to the gas exchange between the alveoli and blood capillaries of the lungs. Oxygen diffuses from alveolar air into the blood during external respiration. Carbon dioxide (by product - cells waste) diffuses out from the blood into the alveolar air during external respiration.
The most important function of breathing is the supplying of oxygen to the body and balancing of the carbon dioxide levels. Under most conditions, the partial pressure of carbon dioxide (PCO2), or concentration of carbon dioxide, controls the respiratory rate. If the partial pressure of carbon dioxide is too high, you will breth faster and deeper to eliminate CO2.

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