The neurotransmitter responsible for muscle contraction, since it will be released into the synapse.
This is released from the sarcoplasmic reticulum in response to the change in voltage across the membrane during a nerve transmission through muscle. It binds to troponin so that cross-bridges form between actin and myosin
Myosin- These molecules have a club-shaped head that will extend toward and bind to another binding site to pull the muscle together.
The electrical current generated by the reversal of charge across the muscle cell membrane, which causes the muscle to contract.
Skeletal Muscle
This is the neuromuscular junction where a nerve impulse reaches a sarcolema.
Cardiac Muscle
A-band
Z-line
Smooth Muscle
This depicts the unit called the sarcomere which is responsible for an individual muscle cell contraction.
A dark thin protein band to which actin filaments are attached in a striated muscle fiber, marking the boundaries between adjacent sarcomeres
- Attached to bones - Voluntary, you control these muscles - Striated - Single, long, cylindrical multi-nucleate cells - Strong, rapid contraction - Not rhythmic
- Found only in the heart - Involuntary - Has striations - They are branching chains of cells - Steady, rhythmic contractions
Action Potential
Calcium
Actin- contains binding sites that are covered by regulatory proteins until calcium ions are present to allow a binding molecule to attach itself to it and pull the two molecules past each other.
Acetylcholine
The interaction between actin and myosin filaments in this area of the sarcomere is responsible for the muscle contraction.
Mostly in walls of hollow, visceral organs NO striations Spindle-shaped cells in sheets or layers Slow, sustained contractions move substances through the organ or along a tract
Tendon- a fibrous connective tissue that connects a muscle to a bone.
