Actin filaments are incapable of lasting the entire lifetime

Actin filaments are incapable of lasting the entire lifetime of the cell. True False Which channel needs to be in the open state during the rising phase of an action potential? Voltage-gated Na^+ channels Voltage-gated K^+ channels NaK pumps Delayed rectifier K^+ channels The action potential does not reverse direction on its own because The voltage-gated K^+ channels are in their open state The voltage-gated Na^+ channels cannot transition directly from inactive to open states. The voltage-gated Na^+ channels are in their inactivated states. The delayed rectifier K^+ channels cannot transition directly from inactive to open states. If a neuron receives an excitatory input from another neuron, it will always fire an action potential. True False The following is an example of an excitatory neurotransmitter. Valine GABA Glycine Acetylcholine

Solution

5. (a) True

Actin cytoskeleton is dynamic, it keeps rearranging and reorganizing according to celllular movements. Half life of actin filaments is shorter than the life time of a cell.

6.(a) Voltage gated sodium channels

As the stimulus crosses theshold potential, the Voltage gated sodium channels open and cause further depolarization of neuron.