Question

dscribe nephron ........

Answer 1

it may help u................

Answer 2

The nephron is the microscopic structural and functional
unit of the kidney . It is composed of a renal corpuscle
and a renal tubule. The renal corpuscle consists of a
tuft of capillaries called a glomerulus and an
encompassing Bowman's capsule . The renal tubule
extends from the capsule. The capsule and tubule are
connected and are composed of epithelial cells with a
lumen . A healthy adult has 0.8 to 1.5 million nephrons
in each kidney. Blood is filtered as it passes through
three layers: the endothelial cells of the capillary wall,
its basement membrane, and between the foot
processes of the podocytes of the lining of the capsule.
The tubule has adjacent peritubular capillaries that run
between the descending and ascending portions of the
tubule. As the fluid from the capsule flows down into
the tubule, it is processed by the epithelial cells lining
the tubule: water is reabsorbed and substances are
exchanged (some are added, others are removed); first
with the interstitial fluid outside the tubules, and then
into the plasma in the adjacent peritubular capillaries
through the endothelial cells lining that capillary. This
process regulates the volume of body fluid as well as
levels of many body substances. At the end of the
tubule, the remaining fluid— urine —exits: it is composed
of water, metabolic waste , and toxins .