IB Biology Topic 11.2 (HL): Movement

This video begins to introduce the types of muscle and then delves into the third, skeletal muscle. It covers its macroscopic structure in detail, followed by the structure of its most basic unit, the sarcomere. This is followed by discussion of the process of sarcomere contraction. Next, the video explains how bones act as levers through examples of the grasshopper limb and human elbow. The video concludes on the concept of the synovial joint.

00:00 Introduction
00:20 Types of muscle
00:39 Structure of skeletal muscle
01:16 Structure of a sarcomere
02:22 Electron micrograph of a sarcomere
02:27 Sarcomere resting state
03:05 Sarcomere contraction
04:28 Changes to the sarcomere
04:42 Example question
05:41 Preview finished!

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[khalilElMoghazi]

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