Question

There is a pair of bean-shaped organs P in the human body towards the back, just above the waist. A waste product Q formed by the decomposition of unused proteins in the liver is brought into organ P through blood by an artery R. The numerous tiny filters S present in organ P clean the dirty blood by removing the waste product Q. The clean blood goes into circulation through a vein T. The waste substance Q, other waste salts, and excess water form a yellowish liquid U which goes from organ P into a bag-like structure V through two tubes W. This liquid is then thrown out of the body through a tube X.
(d) Name (i) liquid U (ii) structure V (iii) tubes W, and (iv) tube X.

Answer 1

(i) Liquid U is Urine

• It consists of water, urea , inorganic salts, creatinine, ammonia, and pigmented products of blood breakdown, one of which (urochrome) gives urine its typically yellowish colour.

(ii) Structure V is Bladder

• The urinary bladder is a temporarily stores urine for some time.

(iii) Tubes W is Ureters

• Tubes called ureters transport urine to the urinary bladder

(iv) Tube X is Urethra

• Urethra allows urine to pass outside the body