What are tubules in nephrons?
Each nephron is a long tubule (or extremely fine tube) that is closed, expanded, and folded into a double-walled cuplike structure at one end. This structure, called the renal corpuscular capsule, or Bowman’s capsule, encloses a cluster of capillaries (microscopic blood vessels) called the glomerulus.
Where does tubular reabsorption occur?
Tubular reabsorption is the second major step in urine formation. Most of the reabsorption of solutes necessary for normal body function, such as amino acids, glucose, and salts, takes place in the proximal part of the tubule.
What do renal tubules reabsorb?
The distal convoluted tubule and collecting ducts are then largely responsible for reabsorbing water as required to produce urine at a concentration that maintains body fluid homeostasis.
What is the process of tubular reabsorption?
Tubular reabsorption is the process by which solutes and water are removed from the tubular fluid and transported into the blood.
What are the 5 components of a nephron?
Each nephron is composed of a renal corpuscle (glomerulus within Bowman’s capsule), a proximal tubule (convoluted and straight components), an intermediate tubule (loop of Henle), a distal convoluted tubule, a connecting tubule, and cortical, outer medullary, and inner medullary collecting ducts.
What is the function of renal tubules?
One of millions of tiny tubes in the kidneys that returns nutrients, fluids, and other substances that have been filtered from the blood, but the body needs, back to the blood. The remaining fluid and waste in the renal tubules become urine.
What is tubular reabsorption and secretion?
The key difference between tubular reabsorption and tubular secretion is that tubular reabsorption involves the removal of some solutes and water from the tubular fluid and their return to the blood, while tubular secretion involves the removal of hydrogen, creatinine, and drugs from the blood and return to the …
How kidney tubules reabsorb glucose from the filtrate?
Under normal circumstances, up to 180 g/day of glucose is filtered by the renal glomerulus and virtually all of it is subsequently reabsorbed in the proximal convoluted tubule. This reabsorption is effected by two sodium-dependent glucose cotransporter (SGLT) proteins.