Please enable JavaScript.
Coggle requires JavaScript to display documents.
Muscular System (Sliding Filament Theory (Nerve impulses or actin…
Muscular System
Sliding Filament Theory
- Nerve impulses or actin potential travels down the sarcolemma and into T-tubes, causing sarcoplasmic reticulum to release Ca++ into the sarcoplasm
- Ca++ binds to actin myofilament, exposing the myosin binding site.
- Myosin attaches to actin, forming actin and myosin cross bridges.
- Myosin head moves toward the M line of the sarcomere, pulling actin filaments past myosin
- This action is repeated many times powered by ATP, it requires energy.
- Z lines get closer together as actin and myosin filaments slide past each other and sarcomeres shorten.
-
-
Muscle Relaxation
- Ach is broken down by an enzyme called acetylcholinesterase.
- Action potentials are no longer generated, so the Ca++ channels in sarcoplasm reticulum dense
- Resting potential is reached when Na+ returns to its initial.
-
-
-
-
-
Hyperextension
Extension beyond 180 degrees, movement that decreases angel of joint flexion, movement that increases angle of joint. Helps with bending your knee.
Extension
movement of a bone around a longitudinal axis, allows you to shake your head
-