Activity 4.2.1: Muscle Rules Introduction All movement in the human body, from wiggling a toe or swimming a mile to eating and digesting a sandwich, is the result of muscle action. In previous lessons, you have learned about connective and nervous tissue. In this unit, you will explore the structure and function of another incredible tissue -- the muscle. When we think of muscles, we usually focus on the muscles that move our bones and allow us to move about the Earth; the tissues we see from the outside. But inside the amazing human, you will find other types of muscle tissue that work silently to move substances around the body. Your heart keeps beating and your food continues to digest even when you fall fast asleep and close your conscious mind for the day. Without muscle moving blood or distributing nutrients from food, the human machine would power down. There are 206 bones in the human body, but over 600 skeletal muscles allow our bodies to move in different directions. Over sixty of these muscles are found in your face alone. You use forty of these muscles every time you frown, but only twenty muscles when you smile. The human body is even built to make it easier to be happy than to be sad. Skeletal muscles are attached to bones with tough cords or sheets called tendons and these bones meet other bones at junctions called joints . The contraction or shortening of muscles pulls on bone and moves the body. In this activity, you will observe and compare the structure and function of the three types of muscle tissue. You will explore the structure of skeletal muscle both by looking at slides and by creating a model of a muscle unit. Before you move on to building actual muscle groups, a series of demonstrations will help you see that the placement of muscles on bones follows specific patterns and rules. These rules will later help you construct specific muscle groups on your Maniken ® . Equipment Computer with Internet access Prepared slides of muscle tissue – Carolina Biological Supply Muscle Types Set Microscope Laboratory journal Colored pencils Terra cotta clay Wire tool or wooden knife Spaghetti Plastic wrap Pencil © 2014 Project Lead The Way, Inc. Human Body Systems Activity 4.2.1 Muscle Rules – Page 1
Anatomy in Clay ® Maniken ® Reference textbook (optional) Procedure Part I- Types of Muscle Tissue 1. Work with your partner to research the three types of muscle tissue: skeletal muscle, smooth muscle and cardiac muscle.
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- Muscle Rules