What is the histological difference between proximal and distal convoluted tubules?
What is the histological difference between proximal and distal convoluted tubules?
1) Staining – proximal tubules are more eosinophilic than the distal. 2) Nuclei – proximal tubule cells have more heterochromatic nuclei than those of distal tubule cells; and there are more nuclei per unit area in the distal tubule than there are in the proximal tubule.
What’s the difference in function distal vs proximal tubule?
The function of the proximal tubule is essentially reabsorption of filtrate in accordance with the needs of homeostasis (equilibrium), whereas the distal part of the nephron and collecting duct are mainly concerned with the detailed regulation of water, electrolyte, and hydrogen-ion balance.
What is the histology of the proximal convoluted tubule?
First, the proximal convoluted tubule – which is the longest part of the renal tubule – has a simple tall cuboidal epithelium, with a brush border (microvilli). The epithelium almost fills the lumen, and the microvilli increases the surface area by 30-40 fold. The lumen is made up of simple squamous epithelium.
How can you differentiate between the cortex and medulla on the histology slide?
The cortex consists of convoluted tubules together with the renal corpuscles. The medulla consists of loops of Henle and collecting ducts. The medulla may be divided into “zones” or “stripes”, visible grossly, which reflect the structural differentiation of the tubules that form the loops of Henle.
What histological feature distinguishes a PCT from the DCT?
36 Cards in this Set
| The BLANK is found between the kidney and the urinary bladder | ureters |
|---|---|
| What histological feature distinguishes a proximal convoluted tubule from a distal convoluted tubule? | microvilli |
| Name the parts of the nephron | glomerular capsule, PCT, loop of Henle, DCT, and collecting ducts |
What is a medullary ray kidney?
The medullary rays are well-defined anatomic structures consisting of bundles of renal tubules which form in the renal cortex and continue through the renal medulla as the medullary striations. Under these conditions, fine striations are visualized which correspond in position and orientation to these structures.
What happens in the PCT?
The PCT transports or metabolizes many drugs and toxicants. Secretion of organic anions, such as p-aminohippurate (PAH), occurs by sodium-dependent secondary active transport from peritubular capillaries into the PCT cell across the basolateral plasma membrane.
What is histology of kidney?
The kidney is organised into many lobes, organised in a pyramidal structure, where the outer portion is made up of cortex, and the inner portion is made up of the medulla. The kidney contains about 1 million functional units called nephrons, which are continuous with a system of collecting tubules.
What histological feature distinguishes a pct from the DCT?
Which structure is between the proximal and distal convoluted tubules?
loop of Henle
The loop of Henle is between the proximal and distal convoluted tubules.
What does the medullary ray contain?
The medullary rays are well-defined anatomic structures consisting of bundles of renal tubules which form in the renal cortex and continue through the renal medulla as the medullary striations.
What’s the difference between a PCT and a DCT?
The terms PCT and DCT means Proximal Convoluted Tubule (PCT) and the Distal Convoluted Tubule (DCT) have many differences between them. Before knowing about PCT and DCT, we have to no about nephron. Nephron is the structural and functional unit of kidney. it has two main parts called Malpighian body and renal tubule.
How is the proximal tubule similar to the DCT?
With the light microscope the straight portion of the proximal tubule is histologically similar to the PCT and the straight portion of the distal tubule is similar to the DCT. Proximal convoluted tubule (PCT). The PCT may be up to 14 mm in length. This is more than twice as long as the average DCT, which is about 5 mm long.
Where are the renal corpuscles and PCT located?
Pars convoluta (cortical labyrinths) areas occupy the region between pars radiata. Within the pars convoluta can be found renal corpuscles, proximal convoluted tubules (PCT), distal convoluted tubules (DCT), and blood vessels (the interlobular arteries and veins and the afferent and efferent arterioles).
What kind of substances are secreted into the PCT?
Hydrogen, ammonia, urea, uric acid, creatinine, and some organic substances such as antibiotics, diuretics, and hormones are secreted into the filtrate at the PCT as well. Distal convoluted tubule (DCT) refers to the convoluted portion of the nephron between the loop of Henle and the collecting duct.
