Question

explain the difference between external respiration and internal respiration

Answer 1

External respiration is the breathing. You breathe in aur then breathe it out, that's external respiration or simply breathing. Internal respiration is the use of oxygen in oxidising food & releasing the energy of food.


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Difference between External Respiration and Internal Respiration
Location:
External respiration occurs between cells of the body and the external environment while internal respiration occurs within cells.

Breathing:
External respiration involves breathing, while internal respiration does not.

Involvement of Hemoglobin:
External respiration involves oxygen attaching to or offloading from the heme of hemoglobin. This is not an internal respiration process.

Oxidation:
Internal respiration involves three stages: glycolysis, Krebs cycle and oxidative phosphorylation; this is not the case for external respiration.

Involvement of Oxygen:
Internal respiration can sometimes occur without oxygen, this is not the case with external respiration.

Entrance:
External respiration involves oxygen first entering the ventilatory structures such as lungs or gills; this is not the case with internal respiration.

Chemical Reaction:
External respiration is the mechanism of how oxygen physically enters the body and is moved around, while internal respiration is only a process of chemical reactions which involves oxygen as a driving force.

Gas Exchange:
External respiration involves gas exchange, internal respiration does not.

Involvement of Water vs. Oxyhemoglobin:
Internal respiration involves protons eventually combining with oxygen to form water while in external respiration oxygen combines with hemoglobin to form oxyhemoglobin.

Answer 2

External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air.internal respiration occurs in the metabolizing tissues,where oxygen difuses out of the blood and carbon dioxide diffuses out of the cells.