Question

Fill in the blanks appropriately Organ Excretory wastes

a. Kidneys

b. Lungs

c. Liver

d. Skin

• A. Lungs excrete Carbon dioxide and some water vapour
• B. Liver excretes cholesterol, steroid hormones, vitamins and drugs via bile.
• C. Kidney excretes urea
• D. Skin excretes ​​​​​​​sweat -water,organic salts(sodium chloride ) and traces of urea and lacticacid.sebum-waxes,sterols, hydrocarbons and fatty acids

Answer 1

Answer: (A), (B), (C), (D)

$a.$
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 decomposed haemoglobin of worn out $RBCs$ into bilepigments 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,organicsalts(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 lacticacid.sebum-waxes,sterols, hydrocarbons and fatty acids