Question

Choose the odd one from each of the following:

Heart, lung, liver, kidney, skin.

Answer 1

Heart:

1. The heart is a muscular, conical organ present in the middle of the thoracic cavity.
2. It is an internal organ which pumps blood in the body.

Lungs :

1. Lungs are air-filled organs present in the thoracic cavity.
2. They are internal organs where gaseous exchange (O₂ and CO₂) takes place in the body.

Liver :

1. The liver is the largest gland present in the abdominal cavity of the body.
2. It is an internal organ performing several functions like secretion of bile, enzymes, drugs and hormones.

Kidney:

1. The kidney is a pair of bean-shaped, reddish-brown organ present in the abdominal cavity.
2. They are internal organs which help in the elimination of toxic waste.

Skin :

1. Skin is the largest organ of the body situated externally.
2. It performs functions like protection and sensation.
3. It shows the presence of hair, glands, nerves and nails.

Final answer: Skin is the odd one as it is externally located while others are internal organs.