The main force that causes filtration in a nephron is:Question 38Select one:a.blood colloid osmotic pressureb.glomerular hydrostatic pressurec.osmotic pressure of the urined.capsular hydrostatic pressuree.reabsorption in proximal convoluted tubule pulls filtrate from blood
Question
The main force that causes filtration in a nephron is:Question 38Select one:a.blood colloid osmotic pressureb.glomerular hydrostatic pressurec.osmotic pressure of the urined.capsular hydrostatic pressuree.reabsorption in proximal convoluted tubule pulls filtrate from blood
Solution
To answer the question about the main force that causes filtration in a nephron, let's analyze each option step by step:
a. Blood colloid osmotic pressure: This pressure is due to the presence of proteins in the blood plasma. It tends to pull water into the circulatory system, opposing filtration.
b. Glomerular hydrostatic pressure: This is the blood pressure within the glomerular capillaries. It is the primary driving force that pushes water and solutes out of the blood and into the Bowman's capsule, initiating the process of filtration.
c. Osmotic pressure of the urine: This pressure is related to the concentration of solutes in the urine. It does not play a significant role in the initial filtration process in the nephron.
d. Capsular hydrostatic pressure: This is the pressure exerted by the fluid in the Bowman's capsule. It opposes the glomerular hydrostatic pressure and resists filtration.
e. Reabsorption in proximal convoluted tubule pulls filtrate from blood: This process occurs after filtration and involves the reabsorption of water and solutes back into the blood. It does not cause the initial filtration.
Based on the analysis, the correct answer is:
b. glomerular hydrostatic pressure
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What part of the nephron produces a filtrate of the blood that consists of water and solutes? A. Proximal convoluted tubule B. Distal convoluted tubule C. Collecting ducts D. Glomerulus
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