In response to activation of acetylcholine GPCRs, PLC, and the elevation in cytosolic Ca²+, Nitric oxide is synthesized in endothelial cells.

TLS Online TPP Program

#Id: 2586

#Unit 7. System Physiology – Animal

The proximal tubule is an important site for secretion of organic acids and bases such as bile salts, oxalate, urate, and catecholamines.

TLS Online TPP Program

#Id: 2649

#Unit 7. System Physiology – Animal

Thin descending and thin ascending segments, have thin epithelial membranes with no brush borders, few mitochondria, & minimal levels of metabolic activity.

TLS Online TPP Program

#Id: 2650

#Unit 7. System Physiology – Animal

Descending part of the thin segment is highly permeable to water and moderately permeable to most

Solutes (urea and sodium).

TLS Online TPP Program

#Id: 2651

#Unit 7. System Physiology – Animal

In the Descending part of the thin segment 

About 20 percent of the filtered water is reabsorbed

TLS Online TPP Program

#Id: 2652

#Unit 7. System Physiology – Animal

The ascending limb, both the thin & the thick segments

is virtually impermeable to water, a characteristic that is important for concentrating the urine.

TLS Online TPP Program

#Id: 2653

#Unit 7. System Physiology – Animal

The thin segment of the ascending limb has a much lower reabsorptive capacity than does the thick segment.