CO2 and O2 in Internal Respiration
O2 out of blood into cells CO2 out of cell into blood
Internal respiration refers to the process of exchanging gases, such as oxygen (O2) and carbon dioxide (CO2) between tissues and blood in the capillaries. The goal of internal respiration is to supply oxygen to the tissues for cellular respiration and to remove the waste product carbon dioxide.
During internal respiration, oxygen diffuses from red blood cells into tissues, while carbon dioxide diffuses in the opposite direction from the tissues into red blood cells. This process is facilitated by concentration gradients and the partial pressures of the gases.
In tissues, the partial pressure of oxygen is lower than in the capillary blood, which allows oxygen to diffuse from the blood into the cells for cellular respiration. At the same time, carbon dioxide is produced as a waste product during cellular respiration, causing an increase in carbon dioxide concentration in the tissues. This increase in CO2 concentration creates a concentration gradient, which allows CO2 to diffuse from the tissues into the capillaries.
The oxygen-rich blood that flows into the tissues delivers oxygen to the cells, and the carbon dioxide-rich blood that flows out of the tissues carries carbon dioxide away to the lungs, where it is removed during external respiration. This process ensures that oxygen is always being supplied to the tissues and that the waste product, carbon dioxide, is being removed from the body.
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