Question

what is the function of nephrons in kidney, neurones in nerves , villi in small intestine

Answer 1

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Although the kidneys are the major osmoregulatory organ, the skin and lungs also play a role in the process. Water and electrolytes are lost through sweat glands in the skin, which helps moisturize and cool the skin surface, while the lungs expel a small amount of water in the form of mucous secretions and via evaporation of water vapor.

Kidneys: The Main Osmoregulatory Organ

The kidneys, illustrated in Figure 22.4, are a pair of bean-shaped structures that are located just below and posterior to the liver in the peritoneal cavity. The adrenal glands sit on top of each kidney and are also called the suprarenal glands. Kidneys filter blood and purify it. All the blood in the human body is filtered many times a day by the kidneys; these organs use up almost 25 percent of the oxygen absorbed through the lungs to perform this function. Oxygen allows the kidney cells to efficiently manufacture chemical energy in the form of ATP through aerobic respiration. The filtrate coming out of the kidneys is called urine.

Answer 2

Nephron is used to separate water, ions and small molecules from the blood, filter out wastes and toxins, and return the molecules required to the blood.

Neurons are used to interpret and transmit impulses from other parts of body to the CNS / PNS and vice versa.

Villi in the intestines increases the surface area of intestines and thus, helps in absorbing nutrients.