Discribe the structure of human excretory
Answers
Answer:
Explanation:
It consists of urinary bladder,ureter,urethra,bowman's capsule these are the main ones
The excretory system in humans consists mainly of the kidneys and bladder. The kidneys filter urea and other waste products from the blood, which are then added to the urine within the bladder. Other organs, such as the liver, process toxins but put their wastes back into the blood. It is up to the kidneys to filter the blood so that toxic substances do not accumulate.
The excretory system has other functions beyond removing waste products from the body. It is also crucial in maintaining internal homeostasis. Parts of the excretory system are also influenced by other body systems, such as the muscular system and skeletal system. For example, the kidneys secrete a hormone which tells the bones to produce more red blood cells.
The primary excretory organs in the human body are the kidneys, ureters and urinary bladder, involved with the creation and expulsion of urine. Through these organs, much of the nitrogenous waste of the body, especially urea, is expelled. Other organs such as the liver, large intestine and skin are also necessary for the excretion of specific metabolic wastes.
The kidneys are paired, bean-shaped organs located in the abdomen, on either side of the spine, under the diaphragm. They are made of a large number of structural and functional subunits called nephrons. These nephrons perform the primary task of filtering blood and removing waste products. Each nephron snakes between the outer cortex of the kidney and the inner medulla, with different activities occurring at each site.Each nephron begins with a globular structure called the Bowman’s capsule located in the renal cortex. This structure receives blood from renal circulation through an afferent arteriole that further divides to form a tuft of capillaries called the glomerulus. The kidney is richly vascularized with capillary beds surrounding each nephron (intertubular capillaries) as well as blood vessels running between the lobes of the kidney (interlobular arteries and veins).
A process of ultrafiltration creates the glomerular filtrate from blood, which is remarkably similar in composition to blood plasma. Water, small molecules, and proteins smaller than 30 kilodaltons in size can pass freely into the lumen of the Bowman’s capsule. The anatomy of each nephron is discussed below.