Introduction to Muscles
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1 Introduction to Muscles
2 Warm Up- Monday 1. Think of one good thing that happened to you over break. 2. On the left hand side of your next open page, write a big Unit Write the essential question on the top of the right page. 4. Record the warm up beneath the EQ. 5. Warm Up: List as many different functions of muscles.
3 Functions of Muscles Place a checkmark to any functions you got correct, cross out any you got wrong and add to your list if you missed one. Produces movement: all movements are because of muscle contraction! Maintaining posture Stabilizing joints (pull on bones for movements and help strengthen joints) Generate heat
4 Special characteristics of muscles Excitability: receive and respond to stimulus Contractility: able to shorten when stimulated Extensibility: ability to stretch when stimulated Elasticity: can recoil and return to resting length BRING YOUR BOOKS ON WEDNESDAY.
5 Warm Up- Wednesday Decide if the following movements are controlled by voluntary or involuntary muscles. 1. Raising your hand in class 2. Your heart beating 3. Blinking your eyes 4. Large intestine walls pushing food through your tract 5. Planking
6 Muscle Fascicle Muscle Fiber (cell) Myofibril (segment) Sarcomere (contractile unit) Myofilament
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9 Warm Up- Friday What is calcium s role in a muscle contraction?
10 Warm Up- Friday What is calcium s role in a muscle contraction? Answer: calcium makes the active site available so that myosin can bind to actin (binds to troponin, changing shape exposing active site)
11 Warm Up- Wednesday Decide if the following movements are controlled by voluntary or involuntary muscles. 1. Raising your hand in class- voluntary 2. Your heart beating-involuntary 3. Blinking your eyes- involuntary 4. Large intestine walls pushing food through your tract- involuntary 5. Planking- voluntary
12 Good Example- Good visuals, labels and voice over explanations
13 Good use of visuals, and labels but no descriptions.
14 Good Example: Good visuals, labels & written explanations
15 Creating Stop Motion -All labels and descriptions will need to be created by you -Make sure the beginning of your stop motion is a couple of slides of your names -Use your phones and download Stop Motion Studio or StO- MO (both are free) -When you are finished either upload to youtube OR save to your camera and then upload it to your drive OR it to Mrs. Beckham
16 Work Time Instructions: Project due Monday 1. Work through the blue handout to define vocabulary and answer the required questions. 2. Once completed decide on your method of how you want to demonstrate muscle contraction: video, stop motion or skit. 3. Information on class website contains helpful book pages, youtube videos, and tutorials on how to use the technology. 4. Make sure your final product includes labels and explanations for the process. 5. Share on google drive with Mrs. Beckham when finished.
17 Warm Up: Monday- welcome back! Decide if you want option 1 or option 2: Option 1: Set a 20 minute timer- when it goes off project work time will be completed and we will take notes. Option 2: Start with taking notes- if we finish early you will have more time to work on your project or make up work if you were absent on Friday. (If we don t finish early, we will stop lecture at the 20 minute marker.) IF YOU WERE ABSENT FRIDAY: Make up project posted on website underneath guidelines.
18 Muscle Contraction Steps 1. Nerve cells of spinal cord attach to each muscle fiber creating a neuromuscular junction 2. The nerve releases acetylcholine, a neurotransmitter
19 3. Acetylcholine binds to the sarcolemma and causes an action potential or electrical impulse through the muscle fiber 4. The action potential causes the T tubules in the sarcoplasmic reticulum releases calcium
20 5. Calcium ions bind to troponin changing its shape removes blocking action of tropomyosin of active sites
21 6. ATP (energy) is split into ADP + P energizing the myosin head 7. Myosin head moves to the cocked position and is attracted to the binding site
22 8. Myosin and actin form cross bridge 9. Phosphate is released starting power stroke
23 10. ATP binds to myosin head causing it to release actin 11. Process continues until calcium removed from t-tubules 12. Troponin/ tropomyosin go back to original shape and block binding site
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