Science Starter What are the 3 types of muscle tissue?

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There are 3 types of muscle tissue:  skeletal  smooth  cardiac

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Presentation transcript:

Science Starter What are the 3 types of muscle tissue? Which is most abundant in our body? Look at the images to the right, what similarities do you see?

Today’s Agenda Science Starter Muscle Tissue Review Chicken Wing Dissection Midterm Review Packet Exit Quiz

Amyotrophic Lateral Sclerosis https://www.youtube.com/watch?v=JNZcC_3YLuo

Cell Shape and Appearance Regulation of Contraction Skeletal Muscle Body Location Mainly attached to the bones Cell Shape and Appearance Single, long, multinucleate cells; striated appearance Regulation of Contraction Voluntary contractions; sometimes activated by reflexes Contraction Speed Ranges from slow to fast based on activity Rhythmic Contraction None because voluntarily controlled

Cell Shape and Appearance Regulation of Contraction Cardiac Muscle Body Location Found only in the heart Cell Shape and Appearance Branching chains of cells; uninucleate cells; striated appearance Regulation of Contraction Involuntary contractions Contraction Speed Slow and steady Rhythmic Contraction yes

Cell Shape and Appearance Regulation of Contraction Smooth Muscle Body Location Walls of hollow organs (ex: stomach, bladder, respiratory organs) Cell Shape and Appearance Single, fusiform shape (tapered at the ends); uninucleate cells; no striations Regulation of Contraction Involuntary contractions Contraction Speed Very slow Rhythmic Contraction Yes in most organs

Muscle Tissue Movement Posture Joint stabilization Heat generation Skeleton: walking, running, etc. Heart: pumping blood through vessels Smooth Muscle: fluids, food, other substances throughout the body Posture Constantly adjust to keep the body erect Joint stabilization Tendons help to stabilize joints as the skeletal muscle allow movement of the body Heat generation as ATP is used to help with muscle contractions, the energy is given off as heat; helps to maintain body temperature

Chicken Wing Dissection You will be graded on 2 things: Lab sheet (80%) Success of Dissection (20%) Make sure you follow all directions and complete the lab within today’s class time Be careful and clean up when you are done! https://youtu.be/qqLXLXFGhhI?t=48s

Chicken Wing Dissection

Chicken Wing Dissection READ through the first page to understand why we are using a chicken wing OBTAIN all the materials that you will need to complete the dissection WRITE observations on your lab sheet ANSWER all questions in the analysis and conclusion

Midterm Review Packet The midterm will be on each of the objectives in the packet! The number of items for an objective in the packet is a great indicator of it’s importance on the midterm Complete the packet over the next 2 days, it will be due before you take the midterm (complete or not, it is the last day of the quarter!)