In response to a stimulus such as pain, a neuron sends a signal to the brain using

a. contraction and relaxation

b. electrical signals and chemical neurotransmitters

c. respiration and absorption

d. myosin and actin

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.