A Brief Note On Gas Exchange And Transport Essay

1762 Words Jun 15th, 2015 8 Pages
Gas Exchange + Transport
Pulmonary circulation: circulation from heart to lungs
Systemic circulation: circulation from lungs to organs
Gas exchange is the movement of oxygen from the lungs to the blood and the movement of carbon dioxide from the blood to the lungs. This exchange occurs in the capillaries, which are microscopic vessels in the lungs.
In humans, nutrients and oxygen are transferred through the bloodstream. Cells can’t rely solely on diffusion, so this transport system is important.
Gas Exchange in Cells
Diffusion is the movement through a cell membrane from low to high concentration, and it is what occurs to move oxygen across the membrane. It occurs in the alveoli and the villi.
The mitochondria releases oxygen as a result of cellular respiration. This is necessary to the creation of ATP, or energy for the cell.
Aerobic vs. Anaerobic Respiration
Aerobic respiration uses oxygen, and anaerobic respiration does not. Instead it has different electron acceptors. However, they both use carbon dioxide and occur in the mitochondria.
Gas exchange in sharks occurs in the gills, and the gill slits found at the side of the head. Sharks have a high oxygen demand, and oxygenated water constantly has to be flowing over the gill filaments for the respiratory system to work. That’s actually why sharks have to swim while they sleep! Water enters through the mouth and the oxygen from the water enters the gill filaments, and the water then exits through the gill slits.

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