Question

Besides mammals, diaphragmatic muscles also occurs in:

• A. Birds
• B. Crocodiles
• C. Fishes
• D. Toads

Answer 1

The correct option is B Crocodiles

• Mammals are characterised by a well-developed diaphragm that separates the thoracic chamber from the abdominal cavity. The diaphragm plays an essential role during breathing in mammals.
• In crocodiles, it is called the Diaphragmaticus muscle and attaches to the hip joint, enveloping their ischium and pubis (pelvic girdle).
• Similar to the diaphragm the contraction of the Diaphragmaticus increases thoracic volume, creating negative air pressure, which aids inspiration.

Hence, the correct answer is B.