Tubules in a sentence

Aldosterone acts primarily on the distal convoluted tubules and collecting ducts of the kidneys, stimulating them to excrete potassium ions into the tubular fluid, and thus into the urine.

Certain sea cucumbers have a cluster of cuvierian tubules which can be ejected as long sticky threads from their anus and entangle and permanently disable an attacker.

Furthermore, the epithelium of the distal convoluted tubules and collecting ducts is impermeable to water in the absence of antidiuretic hormone (ADH) in the blood.

In the kidneys, about 180 liters of plasma is filtered through the glomeruli and into the renal tubules per day. citation This filtering involves about 600 g of sodium and 33 g of potassium.

In the kidneys, aldosterone acts on the distal convoluted tubules and the collecting ducts by increasing the reabsorption of sodium and the excretion of both potassium and hydrogen ions.

It is connected to the nuclear envelope and consists of tubules that are located near the cell periphery.

It is very probable that the renal tubular cells of the distal convoluted tubules are themselves sensitive to the pH of the plasma.

Potassium is excreted twice and reabsorbed three times before the urine reaches the collecting tubules. citation At that point, urine usually has about the same potassium concentration as plasma.

The angiotensin II-stimulated aldosterone released from the zona glomerulosa of the adrenal glands has an effect on particularly the epithelial cells of the distal convoluted tubules and collecting ducts of the kidneys.

The increased reabsorption of Na leads to increased water and urea reabsorption from the proximal tubules of the kidney back into the blood.

The latter feature is due to the presence of elongated loops of Henle ; these are much shorter in birds, and not truly present in other vertebrates (although the nephron often has a short intermediate segment between the convoluted tubules).

There is, however, an increasing body of evidence that suggests the formation of renal cysts starts in utero. citation Cysts initially form as small dilations in renal tubules, which then expand to form fluid-filled cavities of different sizes.

They have a characteristic tubulo-vesicular structure (vesicles up to 1 µm in diameter with connected tubules of approx. 50 nm diameter) and a mildly acid pH.

This is overcome at puberty when cells within seminiferous tubules called Sertoli cells start making their own retinoic acid.

This results in the inhibition of water reabsorption from the kidney tubules, causing high volumes of very dilute urine to be excreted, thus getting rid of the excess water in the body.

Typically, four to six Malpighian tubules occur.