Question

Ureter develops from the funnel like structure known as _________
A. Hilum
B. Renal pelvis
C. Major calyx
D. Minor calyx

Answer 1

Hint: The excretory system is the organ system that is responsible for removal of waste products from the body and maintaining osmoregulation. The prime organs of the excretory system are the kidney which works to separate the urine from the blood. Kidneys are paired bean shaped organs, but they work together with other organs to remove the waste products or urine out of the body.

Complete answer:
The excretory system consists of the kidneys, which are paired organs and are present in the back part of the abdomen. The kidneys are vital organs as they perform important functions to produce and excreting urine from blood and thereby helping the body to get rid of harmful waste materials.

The system of kidney includes several ducts and capillaries which allows the filtration of salts like sodium and chloride. The network of the capillaries helps the kidneys to regulate the amount of water excreted out of the body in the form of urine.

The urine formed by the kidney moves and is collected by the ureter. The ureter then allows the movement of the urine up to the urinary bladder. The urine collected in the urinary bladder is stored and eventually passed out of the body through the opening called the urethra.

The ureter are ducts or tubes which propel urine from the kidneys to the urinary bladder. They are muscular in structure. The ureter is lined by urothelial cells and arises from the renal pelvis. The renal pelvis is a funnel shaped structure present on the medial side of each kidney. It is located within the hilum of the kidney. The renal pelvis receives the urine from the major calyx. It then moves to narrow down to form the ureter.

From this part the ureter descends through the abdomen and now is known as the retroperitoneal structure. In the area of the pelvic cavity, the ureter travels further downwards to reach the urinary bladder. The urinary bladder stores and then moves the urine to the outside by the urethra.

Hence, the correct answer is option (B).

Note: The kidneys are the organs responsible for the formation of urine and separating it from the blood. The separated urine is then excreted out of the body and it passes through several other organs such as the ureter, urinary bladder and the external opening, urethra. The ureter develops from the renal pelvis and moves to the urinary bladder. The combined cation of these organs helps in the excretion of the urine. Thus, the excretory system is also known as the urinary system.