KINE 1P90 Lecture Notes - Lecture 2: Sarcomere, Endoplasmic Reticulum, Ford Power Stroke Engine

• School: Brock University
• Department: Physical Education and Kinesiology
• Course: KINE 1P90
• Professor: David Ditor

Document Summary

Each myo brils is made up rod-like proteins (contractile proteins)tropomyosin covers up the. Active binding site so our muscle aren"t always contracting. The sarcomere is the functional unit of a muscle bre. The end, thin laments but not thick laments. Muscle contracts (shortens) when each sarcomere contracts (shortens) Electrical impulse go across the membrane (action potential) it falls into the dimple (tunnel) now travels down the t tubule, and activates the sarcoplasmic reticulum, and releases the calcium. Transverse tubules: t tubules, run perpendicularly from surface of muscle cell membrane into central portions of the muscle. Bre: since the membrane is continuous with surface membrane-action potential on surface membrane also spreads down into t tubules, spread of action potential down triggers release. Oated around and eventually binds to troponin, causes troponin to change shape, moves tropomyosin out of the way, reaches out, grabs actin. When contraction turns off and want calcium to stop exposing , the calcium goes back up.