Muscular System

What’s this?

What’s this?

Canker sore!Shallow ulcers in the mouth

What causes them?Stress or tissue trauma

Citrus can trigger or worsen symptoms

B12, zinc, iron deficiency

Different than cold sores

Review

• Attaches to bone/face skin• Long, cylindrical, striated• Voluntary

Skeletal

• Walls of the heart• Involuntary• Rhythmic contraction

Cardiac

• Walls of hollow organs• Involuntary, hormones/nervous

system• Slow contraction

Smooth

Review

1. Producing Movement

2. Maintain posture and position

3. Stabilize joints

4. Generate heat

Producing Movement

Obvious here, muscles create movement

Muscle create the ability to walk, swim, run

Circulate blood, maintain blood pressure

Force food through intestines/stomach

Maintain Posture/Position

Everybody Stand up!

Remove the shoe of your dominant foot

Balance on your dominant foot for 1 minute

Notice the slight twitches of your foot to maintain balance

Stabilizing Joints

Muscles/tendons cross the jointsEX: Shoulder/Hip

Extremely important for unstable joints

Generate Heat

In any energy system, there are by product

When you exercise, what happens to your body?

Cars- Exhaust

Exercise-heat

Skeletal Muscle

Attaches to bone via tendonsAttaches to skin in the face

Voluntary from nervous system

Striated muscle (obvious stripes)

Contracts quickly, but also fatigues quickly

Type I v. Type II

Type I – Slow twitch

Type II – Fast twitchType II(a)

Type II(b)

Type I

Oxygen efficient

Necessary for extended muscle contraction (over time)

Longer time before fatige

Type II

Anaerobic

Speed and strength

Fatigue quickly

Type II(a)Combination of type I and type II

Type II(b)Classic fast twitch

Rapid firing

Muscle Tissue Anatomy

Muscle Fiber

Endomysium

Fascicle

Perimysium

Epimysium

Tendon

Structure of Muscle

Activity!

Demonstration using food!

Each table will get 2-3 twizzlers.

Using saran wrap, post it notes and the twizzlers, create a diagram that shows the structure of muscle

Homework

Define terms from the reading:Striated Muscle

Voluntary Muscle

Fascicle

Endomysium

Perimysium

Epimysium

Possible quiz next class!