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 septum in the heart, also known as the ventricular septum, is to separate the two sides of the heart. This is an important function since the right side of the heart carries oxygen-poor blood from the extremities to the heart, and the left side of the heart oxygenates the blood and passes it through the veins. Without the septum, the blood cannot be oxygenated correctly.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 excretory system is to rid the body of waste to maintain homeostasis. The excretory system also regulates the balance of water, salts and other minerals within the body. Several different organs are part of the excretory system, and each has a different function.Full Answer >