MUSCULAR SYSTEM

Read/ Work on Assignments

Quietly

SKELETAL SYSTEM REVIEW Write the OBJ, HW, and W/U on page 99. Warm-up: Answer in notebook.

1. What are the 4 major functions of the skeletal system?

2. What are the 4 major joint types? Give an example of each.

3. What does bone marrow produce for the body?

DISTINGUISH BETWEENVOLUNTARY/ INVOLUNTARY MUSCLES

Voluntary Muscles Muscles that you are able to control. You choose to move them

Involuntary Muscles Muscles that you cannot control They work on their own

3 TYPES OF MUSCLES

Skeletal Muscles Move bones Most common type Tendons: thick bands of tissues

attached to bones Ligaments: thick bands of tissues

connecting muscles to muscles Voluntary Contract quickly and tire more

easily Look striped or striated

3 TYPES OF MUSCLES

Cardiac Muscle

Found only in the heart Striated Involuntary

3 TYPES OF MUSCLESSmooth Muscle Found in the internal organs Ex. Intestines Involuntary Contract and relax steady

HOW DO MUSCLES WORK? When one muscle of a pair contract, the

other relaxes Muscles always pull Over time, muscles can become larger

or smaller, depending on their usage Blood carries, energy-rich molecules to

the muscles so they can do their work.

MUSCLE FATIGUE – PAGE 100 Complete the Muscle Fatigue Lab. For the Clothespin Squeeze Trial 1: keep

squeezing the clothespin until you can’t anymore and write down how many times you squeezed it.

Same for the fist squeeze and book lift. Continue on to Trial 2 and Trial 3 for all 3

activities. Then answer the 3 questions on the

bottom of the page.

SKELETAL AND MUSCULAR SYSTEM VIDEO – 17 MIN http://app.discoveryeducation.com/

player/view/assetGuid/FCCDC511-523A-4632-8CBD-683B37AB6C66