Answer:
The areas that have had the action potential are refractory to a new action potential.
Explanation:
Hope this helps<3
Answer:
Gravity, electricity, and magnetism are considered non-contact forces because they do not physically act on objects.
Explanation:
Gravity, magnetism, and electricity all use fields to act on objects without actually touching them. They can all force objects to move without touching them through these fields.
Our sleep cycles typically last usually 90 to 110 minutes on average.