Final answer:
Activities such as jumping of a frog and writing with a hand involve voluntary muscles, while the pumping of the heart and movement of chocolate in the intestines involve involuntary muscles, which function without conscious control.
Step-by-step explanation:
The activities you listed can be differentiated based on whether they involve voluntary muscles or involuntary muscles. Here is the correct differentiation:
- A) Jumping of a frog involves voluntary muscles because the frog can control this action at will.
- B) Pumping of the heart is controlled by involuntary muscles, specifically the cardiac muscles, which function without conscious control.
- C) Writing with a hand uses voluntary muscles since it requires conscious control of the skeletal muscles in the hand and arm.
- D) Movement of chocolate in your intestine involves involuntary muscles as this is part of the digestive process controlled by smooth muscles, which operate without our conscious control.
In summary, voluntary muscles, like skeletal muscles, are under our conscious control and are used for actions such as moving and writing. Involuntary muscles, such as smooth muscles found in the digestive system and cardiac muscles in the heart, operate automatically and cannot be consciously controlled.