Question

Which of the following is correct regarding the excretion?
A. Large amount of water from renal filtrate is reabsorbed in DCT and a less amount is reabsorbed by PCT.
B. The descending limb of the loop of henle is completely impermeable to salts.
C. Malpighian corpuscle is found in the medulla region of the kidney.
D. The colour of urine is pale yellow and is slightly alkaline in nature.

Answer 1

Excretion is defined as the process by which metabolic waste is eliminated from a body. In vertebrates the main organs through which the excretion takes place are lungs, kidney, and skin. Excretion is a vital task in all forms of life.

Complete Answer:
- Excretory system consists of the capillary network and specialized structures. The human excretory system includes kidney, ureters, urethra and bladder.
- In kidney blood enter through the renal arteries and through the renal veins leaves the kidney.
- In the descending limb of the loop of Henle, the water is reabsorbed from filtrate but Sodium and other solutes are not reabsorbed and result from that hypertonic of blood plasma.
- A Malphigian corpuscle is present in the cortex of every nephron.
- The high amount of water is mainly reabsorbed by proximal convoluted tubules. The color of urine is pale yellow and has acidic pH.

So, the correct answer is the descending limb of the loop of henle is completely impermeable to salts.

Note: There are various functions performed by the excretory systems are: Filtration, Reabsorption, Secretion, and Excretion.
- Each kidney has one million nephrons and blood flow through these nephrons.
- Nephron has the two parts: Renal corpuscle (Bowman capsule and glomerulus) and renal tubules (Proximal convoluted tubule, Loop of henle, and Distal convoluted tubule).