can someone help with these 2?

to allow for a muscle contraction and joint motion to take place The stretch reflex relies on Co-contraction Agonistic dominance An absolute refractory period Reciprocal inhibition QUESTION 20 All of the following are true regarding the characteristics of local and action potentials EXCEPTI Hocal potentials are graded and vary in magnitude, while action potential follow the lor none principle O Local potentials are non decremental, they remain the same from beginning to end, while action potentials are decremental and become weak O local points are reversible, while con potentials are reversible Local potential rely on Sandgated a white action potential the voltage gated ion channels which results in depolarization QUESTION 21 un the course of the hour lecture students an enter the different stages of sleep. How many stages are there? O PT