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Physiology of Kidney

The kidneys perform several vital functions related to homeostasis including excreting waste, regulating water balance, maintaining electrolyte balance, and regulating acid-base balance. The kidneys also play roles in hematopoiesis, endocrine function, regulating blood pressure, and regulating blood calcium levels.

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65 views2 pages

Physiology of Kidney

The kidneys perform several vital functions related to homeostasis including excreting waste, regulating water balance, maintaining electrolyte balance, and regulating acid-base balance. The kidneys also play roles in hematopoiesis, endocrine function, regulating blood pressure, and regulating blood calcium levels.

Uploaded by

priya
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Physiology OF KIDNEY

Kidneys perform several vital functions besides formation

of urine. By excreting urine, kidneys play the principal

role in homeostasis. Thus, the functions of kidney are:

„ 1. ROLE IN HOMEOSTASIS

Primary function of kidneys is homeostasis. It is

accomplished by the formation of urine. During the

formation of urine, kidneys regulate various activities in

the body, which are concerned with homeostasis such

as:

i. Excretion of Waste Products

Kidneys excrete the unwanted waste products, which

are formed during metabolic activities:

ii. Maintenance of Water Balance

Kidneys maintain the water balance in the body by

conserving water when it is decreased and excreting

water when it is excess in the body. This is an important

process for homeostasis.

iii. Maintenance of Electrolyte Balance

Maintenance of electrolyte balance, especially sodium

is in relation to water balance. Kidneys retain sodium if

the osmolarity of body water decreases and eliminate

sodium when osmolarity increases.

iv. Maintenance of Acid–Base Balance

The pH of the blood and body fluids should be

maintained within narrow range for healthy living. It is

achieved by the function of kidneys.

. HEMOPOIETIC FUNCTION

Kidneys stimulate the production of erythrocytes by


secreting erythropoietin. Erythropoietin is the important

stimulating factor for erythropoiesis (Chapter 10). Kidney

also secretes another factor called thrombopoietin,

which stimulates the production of thrombocytes

3. ENDOCRINE FUNCTION

Kidneys secrete many hormonal substances in addition

to erythropoietin and thrombopoietin (Chapter 72).

Hormones secreted by kidneys

i. Erythropoietin

ii. Thrombopoietin

iii. Renin

iv. 1,25-dihydroxycholecalciferol (calcitriol)

v. Prostaglandins.

„ 4. REGULATION OF BLOOD PRESSURE

Kidneys play an important role in the long-term regulation

of arterial blood pressure (Chapter 103) by two ways:

i. By regulating the volume of extracellular fluid

ii. Through renin-angiotensin mechanism.

„ 5. REGULATION OF BLOOD CALCIUM LEVEL

Kidneys play a role in the regulation of blood calcium

level by activating 1,25-dihydroxycholecalciferol into

vitamin D. Vitamin D is necessary for the absorption of

calcium from intestine

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