Drews+muscular+system+hw

Muscular System Chapter 12 pp 227-236 (New Unit called Move it) 1. What are the three types of muscles in the body and what is the function of each? Smooth Muscle-used for organs. The movement is involuntary Cardiac muscle-pumps blood in the heart. Skeletal Muscle-controls movement of bones.

2. How do skeletal muscles work together to cause the bones to move? They expand and contract at the same time.

3. Insert an image of the major muscles in the body like the one on page 231. You will need to know the location and function of the following (write the function next to the name -- see page 231)

[|http://people.uleth.ca/~little/PE2110/funcanatomy/2front%20muscle.jpg]

Pectoralis major-brings arms forward Deltoid-brings arm away from body Trapezius-raises scapula biceps brachii-bends forearm at elbow triceps brachii-straigtens forearm and elbow External oblique-Compresses abdomen latissimus dorsi-brings arms down gluteus maximus-extends thigh back quardriceps femoris-straigtens leg at knee gastrocnemius-turns foot downward

4. Define myofibrils, sarcomeres, myosin, actin Myofibrils-Contractile portion of muscle cells. Sarcomeres-unit that produces muscle contraction Myosin-One of two major proteins of muscle. Actin-One of two major proteins in muscle

5. Describe the structure of a sarcomere's thick and thin filaments.

6. Describe the sliding filament model and insert image (How does the sarcomere contract?)