Answer Happy

Which of the following are TRUE, when describing the Action Potential of a Skeletal Muscle? Select ALL that are true. When voltage-activated K+ channels close, the Na/K-ATPase and Leakage channels for both K+ and Na+ allow the membrane to continue repolarizing to resting membrane potential. A graded potential depolarizes the membrane to a threshold of -50 mv, triggering Voltage-Activated K+ channels to open after a delay. Increasing K+ permeability rapidly repolarizing and then hyperpolarizing the membrane. These channels close when the membrane hyperpolarizes. Resting membrane potential is more polarized than in neurons, because of more Leakage channels for K+ At peak depolarization, Voltage-gate Na+ channels close, and inactivate when the membrane returns to resting membrane potential. Resting membrane potential is more polarized than in neurons, because of fewer Leakage channels for K+ and a Voltage-Sensitive K+ channel that is open at rest A short time after opening, Voltage-gated Na+ channels inactivate, and close when the membrane returns to resting membrane potential. Agraded End-Plate Potential depolarizes the membrane to a threshold of -50 mv, triggering Voltage-Activated Na+ channels to open. Increasing Na+ permeability rapidly depolarizes the membrane. A graded potential depolarizes the membrane to a threshold of -50 mv, triggering Voltage-Activated K+ channels to open after a delay. Increasing K+ permeability rapidly. These channels close when the membrane repolarizes.