Question

Ducts of Bellini are found in
(a)Liver
(b)Intestine
(c)Medulla oblongata
(d)Kidney

Answer 1

Hint: Ducts of Bellini are also called papillary ducts. They concentrate and transport urine from the nephrons to larger ducts that connect with the renal calyces, cavities in which urine compiles until it flows through the renal. Several collecting ducts join to form the discharging duct, which is also known as the duct of Bellini. All discharging duct open to the pelvis at the summits of real pyramids. From the pelvis, it leads out the urinary duct.

Complete answer:
The urinary tubule is the long and coiled part of the neuron. It has two portions namely the proximal secretory part and distal excretory or collecting part. The secretory part in turn has three portions, proximal convoluted tubule (PCT), Henle's loop, and distal convoluted tubule( DCT). Convoluted tubules are the highly contorted portions, lying in the cortex region. Henle's loop is a narrow loop-like middle portion, lying in the medulla. It has two limbs, namely a descending limb and ascending limb. Terminally, the excretory portions of several tubules join to form a collecting tubule. Several collecting ducts join to form a discharging tubule which is also known as the duct of Bellini. All the discharging ducts open to the pelvis at the summits of the renal pyramid. From the pelvis leads out the urinary duct or ureter. Thus, the Duct of Bellini is a part of the kidney. Kidneys are the principal urinary organs of man.

Additional Information: -A pair of mesodermal kidneys are the principal urinary organs of man. In addition to them, skin also serves as an excretory organ.
- Human kidneys are bean-shaped and dark-red bodies, lying one on each side of the vertebral column.
- The inner margins of each kidney is concave, the outer margin is convex.
-Each kidney is formed of about one million coiled tubules, known as neurons.
- A nephron has two portions, namely the Malpighian capsule, and urinary tubule.
-Malpighian capsule is the basal capsular portion. The urinary tubule is the terminal tubular portion
- As we said earlier, The duct of Bellini is a part of the Urinary tubule. It is also known as the discharging tubule.
So, the correct answer is (d)-Kidney.

Note: The Malpighian tubule has two parts, namely glomerulus and Bowman's capsule. The glomerulus is a vascular network. Bowman’s capsule is a double-walled epithelial cup that encloses the glomerulus. The glomerulus is the center of filtration. Glomerular ultrafiltration is non-selective ultrafiltration. The fluid filtered is known as glomerular ultrafiltration. It forms the primary urine.