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Filtration occurs when blood is filtered in the glomerulus to form filtrate, which contains water and small molecules. Reabsorption happens when essential substances are reabsorbed from the filtrate back into the bloodstream, such as water, glucose, and ions. Filtration is a passive process driven by blood pressure, while reabsorption is an active process that requires energy to move substances against their concentration gradients.
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What is the filtration rate controlled by?
The filtration rate in the kidneys is primarily controlled by blood pressure and the action of hormones such as aldosterone and antidiuretic hormone. These factors regulate the amount of blood flow through the glomerulus and the permeability of the filtration membrane.
Where does glomerular filtration occur?
Glomerular filtration occurs in the renal corpuscle within the kidney, specifically in the glomerulus. The glomerulus is a network of capillaries where blood is filtered to form urine through the filtration barrier.
Do glucose and water enter the filtrate?
Glucose enters the filtrate through the glomerular filtration process in the kidneys, but almost all of it gets reabsorbed by the renal tubules. Water freely enters the filtrate during the filtration process, but its reabsorption is tightly regulated by the kidneys based on the body's hydration needs.
What are the three targets of PTH?
Bones: PTH increases bone resorption, releasing calcium and phosphorus into the bloodstream. Kidneys: PTH stimulates the reabsorption of calcium and the excretion of phosphorus in the kidneys. Intestine: PTH indirectly promotes calcium absorption in the intestine through its actions on vitamin D.
What factors affect GFR?
Factors that can affect glomerular filtration rate (GFR) include blood pressure, blood flow to the kidneys, kidney function, and substances like drugs that can impact filtration. Conditions like diabetes, hypertension, or kidney disease can also affect GFR. Additionally, age and hydration status can influence GFR levels.
Do kidneys have filtration and absorption properties?
Yes, the kidneys have both filtration and absorption properties. Filtration occurs in the glomerulus, where blood is filtered to remove waste products and excess substances. Absorption occurs in the renal tubules, where essential substances are reabsorbed back into the bloodstream.
What waste the kidneys excrete?
The end product of filtration and re-absorption in the kidneys is urine.
What are the steps of filtration of blood in the kidneys?
These are 1. Glomerular filtration, 2. Selective re-absorption and 3. Tubular secretion. All these three steps are performed in kidney nephrons.
What are the 3 steps of blood filtration in the kidneys?
These are 1. Glomerular filtration, 2. Selective re-absorption and 3. Tubular secretion. All these three steps are performed in kidney nephrons.
The kidneys regulate the chemical composition of blood by utilizing the process of?
filtration, reabsorption, and secretion. Filtered blood passes through the kidneys where waste products are removed and essential substances are reabsorbed back into the bloodstream. The kidneys also adjust the levels of electrolytes and water through these processes to maintain homeostasis in the body.
What describes how kidneys remove nitrogenous waste from the blood?
Kidneys remove nitrogenous waste, such as urea and creatinine, from the blood through a process called filtration. Blood is filtered in the kidneys, and waste products are removed from the blood and excreted in urine. This helps maintain the body's internal environment by regulating the balance of electrolytes and waste products.
Where do filtration of the blood and re-absorption of nutrients occur?
Filtration of the blood and re-absorption of nutrients primarily occur in the kidneys, specifically in the structures called nephrons. The nephrons filter the blood to remove waste products and then reabsorb essential nutrients, electrolytes, and water back into the bloodstream.
Where filtration of blood takes place?
kidneys
Which processes could occur un individual 3?
In an individual, processes that could occur include digestion of food in the stomach, absorption of nutrients in the small intestine, and filtration of waste products in the kidneys.
What is the process of the kidneys taking out the impurities from the blood?
filtration
What is the filtration rate controlled by?
The filtration rate in the kidneys is primarily controlled by blood pressure and the action of hormones such as aldosterone and antidiuretic hormone. These factors regulate the amount of blood flow through the glomerulus and the permeability of the filtration membrane.
How does the kidneys filters from the blood?
Ultra-filtration within the kidney forces the waste product out, during the process some smaller useful material are also forced out into urine. These are then reabsorbed, this is called selective re-absorption.
