The primary function of the proximal convoluted tubule is to reabsorb most of the materials needed from the filtrate as it passes through the kidneys, explains HowStuffWorks. The proximal convoluted tubule reabsorbs approximately 65 percent of sodium and most of the water from the filtrate.Know More
Molecules are reabsorbed from the filtrate using specialized transporters located on the nephron. The majority of the sodium transporters are present in the proximal convoluted tubule. Each type of transporter targets a specific type of molecule. Transporters function actively or passively. Active transporters usually require an energy source called adenosine triphosphate. Passive transporters do not require energy to function.
Water is reabsorbed in the proximal convoluted tubule by a process called osmosis. Generally, wherever sodium is reabsorbed, water follows. Sodium is gradually reabsorbed by sodium-potassium pumps placed over the basal membrane of the proximal convoluted tubule. As solutes are removed from the proximal convoluted tubule, the filtrate becomes more hypotonic. When the filtrate leaves the proximal convoluted tubule, it is isotonic. The filtrate is isotonic because it is osmotically balanced due to the continuous reabsorption of water and solute. The rate of flow of the filtrate and the concentration of small molecules within the filtrate are major factors that can affect the process of reabsorption.Learn more about Human Anatomy
Tubular reabsorption occurs along the renal tubules of the kidneys, explains Dr. Perry Carter of Midlands Technical College. A renal tubule consists of a proximal convoluted tubule, the loop of Henle and distal convoluted tubule. Filtrate from the renal corpuscle drains into the proximal convoluted tubule, where reabsorption immediately begins.Full Answer >
The primary function of the villi in the small intestine is to increase the absorption of nutrients from food passing through the small intestine. Intestinal villi are small thread-like objects that line the intestines in order to effectively increase the surface area of the intestinal wall.Full Answer >
The primary function of the respiratory system is to provide oxygen to every part of the body through the process of inhaling oxygen and exhaling carbon dioxide. The respiratory system consists of tissues and organs inside the body that allow people to breathe. This system includes blood vessels, the lungs, airways and certain muscles. The major airways of the respiratory system include the nose, windpipe, mouth, bronchial tubes and larynx.Full Answer >
The primary function of the prostate gland is to secrete the alkaline fluid found in semen, states Johns Hopkins Medicine. Its secondary function is to propel the fluid and sperm cells into the urethra so it can be expelled through the tip of the penis during ejaculation.Full Answer >