What is the straight part of the renal tubule?
The proximal tubule has been divided (morphologically and functionally) in two portions: the proximal convoluted portion (pars convoluta), which occupies the cortical labyrinth, and the straight portion (pars recta), in the medullary rays of the cortex and outer medulla.
What is the proximal straight tubule?
The proximal tubule is the first nephron segment after the glomerulus where reabsorption commences. It is important to note that proximal solute and water reabsorption proceeds primarily in an isotonic fashion with very small changes in luminal osmolarity.
What is the function of distal convoluted tubule?
The distal convoluted tubule (DCT) is a short nephron segment, interposed between the macula densa and collecting duct. Even though it is short, it plays a key role in regulating extracellular fluid volume and electrolyte homeostasis.
What is completely reabsorbed in the proximal tubule?
The proximal tubule normally reabsorbs 100% of filtered glucose, amino acids, and small peptides. On the apical surface, this movement is due to Na+-coupled cotransport.
What is distal tubule?
The term distal tubule has been used by anatomists to denote the region of the nephron that extends downstream from the macula densa to the confluence of another tubule (i.e., the collecting system) (Figure 1) (2). It includes two nephron segments, the DCT and the connecting tubule (CNT).
What are proximal tubules?
The Proximal Tubule. The proximal tubule (see Fig. 13.7) is an intensely active region of the nephron where two-thirds of the glomerular filtrate, including water, important ions, and small molecules, is reabsorbed.
What are the two main parts of nephron?
A nephron is made of two parts:
- a renal corpuscle, which is the initial filtering component, and.
- a renal tubule that processes and carries away the filtered fluid.
What kind of structure is the nephron in the kidney?
They are the microscopic structure composed of a renal corpuscle and a renal tubule. The word nephron is derived from the Greek word – nephros, meaning kidney. There are about millions of nephrons in each human kidney. The mammalian nephron is a long tube-like structure, its length varying from 35–55 mm long.
What is the structure of the renal tubule?
The renal tubule is a U-shaped structure. As the filtrate travels through the renal tubule, some of it is reabsorbed back into the blood while other content is secreted from the blood and added to the filtrate already in the tubule. Whatever is left is ultimately excreted as urine.
Where does the word nephron come from in medical terms?
They are the microscopic structure composed of a renal corpuscle and a renal tubule. The word nephron is derived from the Greek word – nephros, meaning kidney.
Is the glomerular capsule the same as the nephron?
While the picture shows the glomerular capsule and the rest of the renal tubule look to be the same in the graphic below, they are in fact composed of a wide variety of cell types, intended to extract and retain certain chemicals within the tubules. Each nephron consists of one main interlobular artery feeding a single renal tubule.