Do Now: What are the functions of muscles?

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Presentation transcript:

Do Now: What are the functions of muscles? What are the 3 types of muscles? What connects muscle to bone? What kind of joint is in your elbow? Copyright © 2014‒2015 National Academy Foundation. All rights reserved.

How our Muscles Work Muscles work by CONTRACTING (getting shorter and fatter) and pulling on bones. © HEB

How our Muscles Work Muscles are attached to bones by strong non-stretchy TENDONS. muscle tendons © HEB

Our Achilles tendon in our heel © HEB

How our Muscles Work A muscle’s ORIGIN is the end attached to the bone that doesn’t move. © HEB

How our Muscles Work The INSERTION is the end attached to the bone that is moved when the muscle contracts. . © HEB

How our Muscles Work But once contracted, a muscle cannot RELAX again by itself. Each muscle needs a partner. © HEB

How our Muscles Work Two muscles working together in opposite directions are called ANTAGONISTIC muscles. © HEB

How our Muscles Work The BICEPS and TRICEPS in our arm are an ANTAGONISTIC PAIR. They work as a pair and in opposite directions. © HEB

Bending our Arm TRICEPS relaxes and is pulled longer BICEPS contracts and bends arm © HEB

Straightening our Arm BICEPS relaxes and is pulled longer TRICEPS contracts and straightens arm © HEB

Part of Antagonistic Pairs . The PRIME MOVER is the muscle that contracts and the ANTAGONIST is the muscle that relaxes. © HEB

Part of Antagonistic Pairs When you move your arm up, your triceps relaxes. The biceps is the PRIME MOVER, and the triceps is the ANTAGONIST. © HEB