Class Summary - Today we reviewed the parts of a muscle fiber. We discussed how sarco and myo mean muscle. Many of the organelles that we are familiar with have different names in the muscle fiber like sarcoplasm / cytoplasm, sarcoplasmic reticulum / endoplasmic reticulum, sarcolemma / plasma membrane. We also talked about a muscle breaks down to a muscle fascicle, a muscle fascicle breaks down to a muscle fiber, a muscle fiber breaks down to a myofibril that breaks down to a sarcomere. Some new things with muscle fibers are the T (transverse) system or T- tubules that expand the sarcoplasmic reticulum and stores Ca+2 ions needed for contraction. Important part of a sarcomere are the zline, thin filaments, thick filaments, titin. We practiced this vocabulary.
Homework - Sarcomere Coloring / Quiz on Muscle Fiber Anatomy on Monday
Objectives - Students will name the components of muscle fiber and describe the function of each.