Given below is the figure of certain organs and associated parts in the human body. Study the same and answer the questions that follow: [5 MARKS]
(a) Name all the organ systems shown completely or even partially.
(b) Name the parts numbered 1 to 5.
(c) Name the structural and functional unit of the part marked '1'.
(d) Name the two main organic constituents of the fluid that flows down the part labeled '3'.
(e) Name the two major steps involved in the formation of the fluid that passes down the part labeled '3'.

Each Part: 1 Mark

(a)
Excretory system - completely
Circulatory system - partially
Endocrine - partially

(b)
1 - Left Kidney
2 - Aorta
3 - Ureter
4 - Urinary bladder
5 - Urethra

(c) Nephron is the structural as well as functional unit of the kidney. There are nearly one million nephrons in a kidney.

(d) Urea, Creatinine are the two main organic constituents of the fluid that flows down the part labeled '3'.

(e) Ultrafiltration, Reabsorption are the two major steps involved in the formation of the fluid that passes down the part labeled '3'.