Question

Proximal and distal convoluted tubules are part of:
A. Seminiferous tubules.
B. Nephron.
C. Oviduct.
D. Vas deferens.

Answer 1

Hint: Sodium ions get reabsorbed in the proximal convoluted tubule, and it plays a vital role in absorbing and being able to absorb glucose, urea and amino acids. Distal convoluted tubules also known as the nephron segment that are present below the downstream of the macula densa.

Complete answer:
Sodium ions are 25% ascending reabsorbed in the loop of Henle which occurs with the potassium and chloride ions that play vital roles to produce urine of various concentrations. And only 8% sodium reabsorbed in the distal convoluted tubules and the collecting ducts and the hormonal controls and also under control in the aldosterone as in the renin angiotensin system.
The sodium potassium pump is used to transport sodium from a low concentration to higher concentration in the cell and then potassium used to low concentration to higher concentration in the cell. And this is the pri- sodium potassium pump in order to maintain the gradients for sodium and potassium. Tubular fluid present into the lumen and in this sodium is at a high concentration in the lumen moving to low concentration.

Therefore the correct option is (B) Nephron.

Note: Kidneys play a very vital role in our body maintaining the salt, fluid, blood pressure by the process of proximal and convoluted tubules segments of nephrons. Nephron is divided into three sections to play a vital role in the body human health and disease, structural and biochemical reactions, and gene of interest, mapping of signaling pathways using microarrays. Genetic study also plays a vital role in the distal convoluted tubule to understand the process at the molecular level.