Excretion: modes, nephron, urine formation, osmoregulation
- Which of the following diagrams is correct with regard to the proximal (P) and distal (D) tubule of the Nephron. Answer: 2. Diagram option (2): P: HCO3-, NaCl, H2O out; H+, NH3 in. D: NaCl, H2O, HCO3- out; K+, H+ in Key idea: The proximal tubule reabsor... 1
- Choose the correct statement given below regarding juxta medullary nephron. Answer: 4. Loop of Henle of juxta medullary nephron runs deep into medulla. Juxtamedullary nephrons have long loops of Henle that run deep i... 1
- Given below are two statements :Statement I : In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.Statement II : The proximal convoluted tubule is lined by simple columnar brush border epithelium… Answer: 3. Both Statement I and Statement II are false Statement I is false. The descending limb of Henle's loop is permeable to water and a... 1
- Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R.Assertion A: Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and medulla.Reason R: Juxta medullary neph… Answer: 4. A is true but R is false. Key idea: Nephron types depend on the position of the glomerulus, and the loop of Henle follows from it... 1
- Nitrogenous waste is excreted in the form of pellet or paste by : Answer: 1. Pavo Key idea: Birds are uricotelic. Their uric acid leaves as a semi-solid pellet or paste, which saves water. Pavo (peacock) is... 1
- Match the items given in Column I with those in Column II and select the correct option given below :Column I (Function) | Column II (Part of Excretory System)a. Ultrafiltration | i. Henle's loopb. Concentration of urine | ii. Ureterc. Transport of u… Answer: 3. a-iv b-i c-ii d-iii Ultrafiltration occurs in the Malpighian corpuscle (iv). Urine is concentrated in Henle's loop (i) by the cou... 1
- Which of the following statements is correct ? Answer: 4. The ascending limb of loop of Henle is impermeable to water. Key idea: The two limbs of the loop of Henle differ in permeability,... 1
- The part of nephron involved in active reabsorption of sodium is Answer: 1. proximal convoluted tubule The proximal convoluted tubule (PCT) reabsorbs about 70 to 80 percent of the filtered Na⁺ (with water,... 1
- In mammals, which blood vessel would normally carry largest amount of urea ? Answer: 3. Hepatic Vein Urea is made in the liver, so the blood leaving the liver through the hepatic vein carries the largest amount of ure... 1