Composition of blood remains same whether we take more water or less water.
Explain the mechanism of urine regulation in human being.
Answers
Urinary Excretion
The primary route in which the body eliminates substances is through the kidneys. The main function of the kidney is the excretion of body wastes and harmful chemicals into the urine. The functional unit of the kidney responsible for excretion is the nephron. Each kidney contains about one million nephrons. The nephron has three primary regions that function in the renal excretion process: the glomerulus, proximal tubule, and the distal tubule (Figure 2).
Illustration of the kidneys, with the following components labeled: inferior vena cava, descending aorta, adrenal gland, hilum (opening), right and left kidney, arteries and veins in the renal sinus, renal capsule, medulla, cortex, medullary rays, pelvis of kidney, and ureter.
Figure 1. Components of the urinary system
(Image Source: Adapted from iStock Photos, ©)
Three processes are involved in urinary excretion:
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