Question

Action potentials are usually conducted in one direction because:

a.Sodium and potassium ions flow in one direction on the axon

b. Voltage gated sodium channels are inactivated during the refractory period

c.Axon hillock has higher membrane potential

d. Voltage gated channels opens in one direction only ​

Answer 1

The sodium channels in the neuronal membrane are opened in response to a small depolarization of the membrane potential. ... But action potentials move in one direction. This is achieved because the sodium channels have a refractory period following activation, during which they cannot open again.

Answer 2

Answer:

b.voltage gated sodium channels are inactivated during the refractory period

Explanation:

When ATP binds to myosin, it separates from the actin of the myofibril, which causes a contraction.

The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin.

ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

Muscle cannot always respond to the stimulus due to fatigue and production of lactic acid this period is called refractory period.