EXPLAIN THE EXCRETORY SYSTEM OF HUMAN BEING
Answers
Answer:
Explanation:
The excretory system of human beings includes a pair of kidneys, a pair of ureters,a urinary bladder and a urethra. Kidneys are located on either side of vertebral column. Urine produced in the kidneys passes through the ureters into the urinary bladder where it is stored until it is released through urethra.
Just as carbon dioxide is removed from the blood in the lungs , nitrogenous wastes such as urea are removed from blood in the kidneys. A cluster of very thin walled blood capillaries perform this. each capillary cluster is associated with cup shaped end of a tube that collects filtered urine. Each kidney has large number of these filtration units called nephron.Some substances in initial filtrate such as glucose, amino acids , water are selectively reabsorbed as the urine flows through the tube.
The urine forming in each kidney enters ureter which connects the kidneys with urinary bladder. Urine is stored in urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through urethra. The bladder is muscular so we can usually control the urge to urinate as a result of nervous control...
Hope it helps...
Please mark brainiest if it helps you ..
Answer:
Hey there,
PARTS OF URINARY SYSTEM :-
Kidneys :-
--------------------------------------------------
are the two organs at the back of the body, just below the ribs. They are the main organs of excretion, filtering out unwanted substances from the blood and regulating the level and contents of body fluids, Blood enters a kidney in a rental artery and leaves it in a renal vein.
ureters:-
---------------------------------------------------
The two tubes which carry urine from the kidneys to the bladder.
Bladder or urinary bladder:-
----------------------------------------------------
A sac which holds stored urine. it's lining has many folds which flateen out as it fills up, letting it expand.
Urethra :-
----------------------------------------------------
The tube carrying urine from the bladder out of the body. In men, it also carries sperm. The expulsion of urine is called urination or micturition.
INSIDE A KIDNEY :-
Nephrons :-
----------------------------------------------------
The tiny filtering units of the kidneys ( there are about 1 million per kidney ) . Each consists of a renal corpuscle and a uriniferous tubule.
Real corpuscles or Malpighian corpuscles
The bodies which filter fluids out of the blood . Each consists of a glomerulus and a Bowman's capsule.
Glomerulus :-
------------------------------------------------------
A ball of coiled-up capillaries ( tiny blood vessels ) at the centre of each renal corpuscles. The capillaries branch from an arteriole entering the corpuscle and re - unite to leave the corpuscle as an efferent arteriole.
Bowman's capsule :-
-------------------------------------------------------
The outer part of each renal corpuscle. It is a thin-walled sac around the glomerulus.
uriniferous tubules or renal tubules
--------------------------------------------------------
long tubes each one leading from a Bowman's capsule.
Each has three main parts: -
» the proximal convoluted tubule
» the loop of henlé and
» the distal convoluted tubule - and has many capillaries ( tiny blood vessels ) twined around it. These are branches of the efferent arteriole and they re-unit to form larger blood vessels carrying blood away from the kidney.
Collecting duct or collecting tubule
------------------------------------------------------
A tube which carries urine from several uriniferous tubules into pelvis of a kidney.
kk mate