Question

Neurons are electrically excitable cells in the nervous system that function to process and transmit information from one part the body to another, through specialized connections called synapses. The signaling process is partly electrical and partly chemical. In vertebrate animals, neurons are the core components of the brain, spinal cord and peripheral nerves. Neurons carry messages in the form of electrical signals called nerve impulses or action potentials. An action potential occurs when the resting membrane potential at a specific cell location rapidly rises and falls. As an action potential (nerve impulse) travels down an axon, there is a change in polarity across the membrane of the axon. The list below describes (in no particular order) the events that occur during one action potential. 1 - Membrane is briefly hyperpolarized 2 - A few Na+ gated channels open, and then many sodium ion gated channels open, causing Na+ concentration to increase along the inner side of the neuron's cell membrane. 3 - Nagated channels close and K+ rapidly flood out of the cell. 4 - The sodium-potassium pump restores the normally high K+ concentration inside the nerve cell. 5 - Gated sodium and potassium ion channels are closed, while Na+ and K+ move through open leak channels. The membrane potential is -70 mv 6 - Membrane potential is completely depolarized at +30 mv. The 6 steps above are not in the correct order. Select one of the following that lists the 6 steps in the CORRECT ORDER as they would occur during one action potential. Select one: 2, 3, 6, 5, 4, 1 6, 4, 3, 1, 2,5 5, 2, 6, 3, 1,4 3,4,1,5,6,2 5, 1,4,3,2,6