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Infections can be caused by a variety of different microorganisms. Amongst them, pathogenic viruses can cause a range of different condition, such as the common cold (the flu virus) and the HIV virus. Vir...
Na+ ions are actively transported from ascending limb this lowers the water potential in the medulla water diffuses out go the descending limb, but not the ascending limb as it is impermeable water also l...
Diffusion is the movement of a substance from an area of high concentration to an area of low.For example, imagine spraying a deodorant can. The substance coming out of the can is at high concentration an...
Diffusion is the main mechanism for absorption within the small intestine, so effective diffusion is the key to sufficient nutrient absorption. The small intestine has a very large surface area, created b...
Gaseous exchange in humans takes place in the alveoli in the lungs, the aim is to remove carbon dioxide from the lungs and increase oxygen content of the blood.Increased surface area of the exchange surfa...
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