Question

Diaphragm is present in:
I) Human
II) Peacock
III) Turtle
IV) Frog

• A. I only
• B. I and II only
• C. I and III only
• D. I, II, III, IV

Answer 1

The correct option is A I only

The diaphragm is a muscular septum which is normally dome-shaped and it divides the body into the thoracic and the abdominal cavities. It is present only in mammals. The diaphragm is made up of radial muscles which originate from the periphery and is inserted in the central portion of the diaphragm. Due to the contraction of these muscles, the diaphragm flattens, and thereby the volume of the thoracic cavity increases which helps in inspiration.
Turtle, peacock and frog do not have diaphragms.