What is the body's response to a current of 50-100 mA?

The body's response to an electrical current in the range of 50-100 mA is typically characterized by pain, muscle contraction, and potential harm to the physiological systems, including effects on the heart. When a current of this magnitude passes through the body, it can lead to involuntary muscle contractions and significant pain due to the stimulation of motor neurons.

Current at these levels can also disrupt normal cardiac rhythms, potentially leading to fibrillation. However, the immediate sensation would be the pain and muscle contractions as the body reacts to the current. This response illustrates how electrical currents affect the neuromuscular system, highlighting the importance of understanding electrical safety and the physiological implications of electrical exposure.

In the context of the other choices, while respiratory issues and heart fibrillation can occur with higher currents, they are not the primary response at the 50-100 mA range. The initial experience upon contact with such a current would predominantly focus on the muscular and pain responses.