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. Then students were to use the anatomy of a muscle fiber kits to assemble a graphic organizer on muscle fibers. It is very important for students to be able to visualize this as muscle contraction is not a 'simple' thing to understand. If students do not understand the makeup of the muscle they will have a very difficult time understanding how it contracts. When students had assembled the graphic organizer correctly, they received participation points for the day. Students who did not assemble correctly will need to do so to receive the points. Students finished off the class period with a review worksheet of the last two days. This is due tomorrow as we will correct it before the quiz. There will be a quiz on the muscle fiber and sarcomere anatomy and functions tomorrow.
Homework - Sarcomere and Muscle Fiber WS / Quiz on Muscle Fiber and Sarcomere Anatomy and Function tomorrow
Objectives - Students will name the components of muscle fiber and describe the function of each.