Question

Fill in the blanks appropriately Organ Excretory wastes
a. Kidneys ___________________
b. Lungs _____________________
c. Liver ______________________
d. Skin _______________________

Answer 1

(a)

Kidney :

Kidneys filter the blood. They remove wastes, control the body's fluid balance, and maintain levels of electrolytes.It mainly excretes urea in urine.

Final answer:

Kidney excretes urea.

(b)
Lungs:

Carbon dioxide and water are the respiratory waste products.Lungs remove the carbon dioxide and some water vapour in the air.

Final answer:

Lungs excrete Carbon dioxide and some water vapour.

(c)

Liver:

• Liver changes decompose haemoglobin of worn out RBCs into bile pigments bilirubin and biliverdin.These pigments are passed to the alimentary canal and are eliminated in the faeces.
• It excretes cholesterol, steroid hormones, vitamins and drugs via bile.
• It deaminates the excess and unwanted amino acids, producing ammonia,which combines with carbon dioxide to form urea. It is removed by the kidney.

Final answer:

Liver excretes cholesterol, steroid hormones, vitamins and drugs via bile.

(d)
Skin:

In mammals the skin excretes by two ways

• Sweat glands: it gives out sweat which consists of water,organic salts(sodium chloride ) and traces of urea and lactic acid.
• Sebaceous glands: it gives out sebum that contains some lipids -waxes,sterols, hydrocarbons and fatty acids.

Final answer:

Skin excretes

• sweat -water,organic salts(sodium chloride ) and traces of urea and lactic acid. sebum-waxes,sterols, hydrocarbons and fatty acids.