Check My Place the following 10 steps to describe the formation of urine in the correct order. 1. Blood is filtered at glomerulus. 2. Select 3 3 Potassium and hydrogen ions are secreted. 4 Select Filtrate enters distal convoluted tubule. 5 Water is reabsorbed as needed to maintain body fluids. Blood is filtered at glomerulus. 7 Water, sodium, and potassium are reabsorbed. Filtrate enters collecting duct. 8 Filtrate enters proximal convoluted tubule. Tubular reabsorption begins. Filtrate enters loop of Henle. Urine enters minor calyx. 3 g Check My Wo:
The correct answer and explanation is:
Here are the correct steps for the formation of urine in the correct order:
- Blood is filtered at the glomerulus.
- Filtrate enters the proximal convoluted tubule.
- Tubular reabsorption begins.
- Filtrate enters the loop of Henle.
- Water, sodium, and potassium are reabsorbed.
- Filtrate enters the distal convoluted tubule.
- Potassium and hydrogen ions are secreted.
- Filtrate enters the collecting duct.
- Water is reabsorbed as needed to maintain body fluids.
- Urine enters the minor calyx.
Explanation:
Urine formation is a complex process that occurs in the kidneys and involves several key steps:
- Blood filtration at the glomerulus: The process begins when blood enters the kidney through the renal artery and reaches the glomerulus, a network of tiny capillaries. Here, the blood pressure forces water, ions, glucose, amino acids, and waste products through the capillary walls into the Bowman’s capsule, creating a filtrate.
- Filtrate enters the proximal convoluted tubule (PCT): The filtrate then flows into the PCT, where a large portion of reabsorption occurs. This includes glucose, amino acids, and most ions like sodium and chloride. Water is also reabsorbed in this section.
- Tubular reabsorption begins: In the PCT, tubular reabsorption is crucial to reclaim valuable substances back into the bloodstream, such as glucose, amino acids, and essential ions.
- Filtrate enters the loop of Henle: The filtrate then moves into the loop of Henle, which plays a key role in creating a concentration gradient that helps with water and sodium reabsorption later.
- Water, sodium, and potassium reabsorption: In the loop of Henle, sodium and chloride ions are reabsorbed, and in the descending limb, water is reabsorbed due to the high osmolarity of the surrounding interstitial fluid.
- Filtrate enters the distal convoluted tubule (DCT): The filtrate then moves into the DCT, where further reabsorption of sodium and water takes place.
- Potassium and hydrogen ions are secreted: At this stage, the body actively secretes potassium and hydrogen ions into the filtrate to maintain electrolyte balance and pH regulation.
- Filtrate enters the collecting duct: The filtrate then enters the collecting duct, which is the final site for the reabsorption of water, particularly in response to the hormone antidiuretic hormone (ADH).
- Water is reabsorbed to maintain body fluids: In the collecting duct, water reabsorption is finely regulated to ensure that the body maintains fluid balance, depending on the body’s hydration status.
- Urine enters the minor calyx: After the reabsorption process is complete, the remaining waste (now urine) is passed into the minor calyx, where it is collected before entering the renal pelvis, then the ureters, and eventually stored in the bladder.
This process ensures that the body maintains homeostasis by filtering and reabsorbing essential substances while excreting waste products.