hyperpolarisation and the refractory period

• what happens during repolarisation


  the voltage gated sodium channels close the potassum channels open and the k+ rapidly diffuse out of the axon
• what will the rapid diffusion of k+ ions do to the memebrnae


  it will reduce the potential difference across the membrane
• what causes the membrane to become initially polarised

  the overshoot
• what happens to the membrane during the refractory period


  the concentration of K+ and Na+ are restored to their resting potential
• how long is the refractory period


  1 millisecond
• what cannot happen during the refractory period


  another action potential cannot be generated
• why cant another action potential be generated during the refractory period


  so that the transmissions is in only one direction