MUSCLES Chapter 1.4.

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Presentation transcript:

MUSCLES Chapter 1.4

What are Muscles? Muscles are the main organs of the system Composed of Muscle Fibers Long and thin cells Myofibrils allow for muscles to contract

MUSCLES There are over 600 muscles in the body. All muscles contract There are 3 kinds of muscles

Three Kinds of Muscle

SKELETAL MUSCLES Connects to bones… causes them to move Voluntary muscles You make them move These muscles react quickly and tire quickly They work in pairs

Tendon vs. Ligament

Movement When your muscle contracts (shortens) it pulls on the tendon, which pulls on your bone and they move together

The biceps are the flexor The triceps are the extensor

SMOOTH MUSCLE Does not have bands They contract without you thinking about it involuntary muscle Controls breathing, blood pressure, and digestion Reacts slowly and tires slowly

CARDIAC MUSCLE 1. Only found in the heart 2. Involuntary 3. Do not tire out 4. Produce their own signal

Keeping your Muscular System Healthy Use it or lose it! Resistance Exercising strengthens Skeletal Muscle Use of Weights and bands Aerobic Exercise Strengthens the Heart Any activity that causes your heart rate to increase Always warm-up and stretch

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