muscle form and function

Question 1

what does acetylcholine open after binding to receptors in the muscle membrane. and what happens after this to allow the muscle to contract
-action potential
-calcium
-troponin
-myosin head

Answer 1

open sodium channels to allow sodium to enter the muscle. creating an action potential.
this stimulates the release of calcium. which binds with troponin.
-myosin heads attach to the binding sites of the actin filiment and creates a power stroke

Question 2

difference between isotonic and isometric contraction

Answer 2

isotonic= produces movement. through walking or moving any part of the body
isometric= produces no movement. used in standing, siting or posture