Skeletal & Muscular Systems Skeletal & Muscular Systems Human Movement Human Movement author unknown address unknown accessed unknown

D. Structure of the Arm D. Structure of the Arm A. Functions of Systems A. Functions of Systems B. Bones and Cartilage B. Bones and Cartilage C. Muscles and Tendons C. Muscles and Tendons author unknown address unknown accessed unknown Play

A. Functions of the Systems 1. Bones have a variety of roles in the body a. support & movement b. protection & storage c. manufacture of blood cells_ author unknown address unknown accessed unknown

2. Muscles produce almost all movement of your body 3. They are also involuntarily controlled functions a. movement through digestive tract b. pumping of blood_ author unknown address unknown accessed unknown author unknown address unknown accessed unknown author unknown address unknown accessed unknown Click

B. Bones and Cartilage 1. The skeleton is made of bone and cartilage 2. Bone is living material containing cells surrounded by a matrix a. calcium phosphate- hardness b. collagen- elasticity_ author unknown address unknown accessed unknown author unknown address unknown accessed unknown author unknown address unknown accessed unknown ClickPlay

3. Cartilage is softer and more elastic than bone a. found in nose, ears, and the ends of movable bones_ author unknown address unknown accessed unknown

C. Muscles and Tendons 1. Muscles are made up of lots of fibers running side by side a. cylindrical cells with many nuclei (several cm long) 2. Work in antagonistic pairs a. flexor- contracts to bend limb b. extensor- contracts to straighten limb_ author unknown address unknown accessed unknown Play

3. Muscles are attached to bone by tendons 4. Tendons are made of slightly wavy fiber bundles a. flexible, but not too stretchy_ author unknown address unknown accessed unknown

1. Skeleton and muscles of the human arm a. scapula, humerus, radius, and ulna b. biceps and triceps c. tendons_ author unknown address unknown accessed unknown D. Structure of the Arm

A. Types of Joints A. Types of Joints B. Synovial Joint B. Synovial Joint C. Movement C. Movement author unknown address unknown accessed unknown

A. Types of Joints 1. A joint occurs where two bones meet a. makes movement possible 2. There are three types of joints a. pivot b. ball-and-socket c. hinge_ author unknown address unknown accessed unknown Play

2. A synovial joint allows the movement of two bones a. cartilage and synovial fluid reduce the friction between the bones b. 3x more than ice_ B. Synovial Joint author unknown address unknown accessed unknown author unknown address unknown accessed unknown author unknown address unknown accessed unknown Click

3. Ligaments surround the joint and connect bone to bone_ author unknown address unknown accessed unknown

C. Movement 1. The contraction of the biceps produces a turning effect a. elbow joint is the pivot b. forearm is the lever c. muscle provides the force_ author unknown address unknown accessed unknown Science Learning accessed Click

2. There is a small distance between the attachment of the biceps and the pivot a. greater force is needed to produce a large effect 3. Muscles are able to produce the needed large forces a. they cannot contract over large distances b. allows for greater speed and movement_ author unknown address unknown accessed unknown