Question

When frog is submerged in water:

• A. Its heartbeat rate increases
• B. Its heartbeat rate decreases
• C. There is no change in heartbeat rate
• D. There is tachycardia

Answer 1

The correct option is C There is no change in heartbeat rate

C. There is no change in heartbeat rate

Reason : When a frog is submerged in water the rate of heartbeat does not change as a change in respiratory system takes place. It's skin starts to respire directly from the dissolved oxygen in water. It is quite permeable and made up of cutaneous tissue layers. When the frog is out of the water it respire through its moist skin or lungs easily. So this change does not create any effect on heart beat rate.