covers the body and protects it from injury, infection, excessive heat or cold, and drying out; includes skin, hair, nails
provides body support, protects certain organs such as the brain and lungs, and works with the muscular system in body movements; includes the ribs, clavicle, humerus, femur, etc.
enables body movement and facial expressions essential to human communication; includes heart
coordinates body's activities by detecting stimuli and directing the body's responses; includes brain, spinal cord, etc.
delivers oxygen and nutrients to body cells and transports waste products to excretory organs; includes heart, arteries, etc.
Ingests food, breaks it down into smaller chemical units for use by the body, and eliminates undigested material, includes colon, gallbladder, etc.
secretes hormones that affect the functions of target cells, and thereby regulates the activities of the other organ systems; includes pituitary gland, etc.
produces gametes; the female system also provides the organs needed to support a developing embryo; includes ovaries and testes
removes waste products from the body and regulates the chemical makeup of blood; includes kidney, urethra, anus
supports function of the circulatory system by returning fluid to blood vessels near the heart; also functions as part of the immune system
defends body against infections and cancer cells; includes white blood cells, red blood cells, etc.
sheets of closely packed cells that cover the entire surface of your body and form the lining of your internal organs
main function is to hold together and support other tissues, and to cushion, insulate, and connect organs
communication tissue; forms an extensive network of neurons, axons, and dendrites all over the body
involuntary muscles that contain smooth muscle tissue and are found in most of your other organs
outer "layer" of bone, surrounds the bone cells; made of the protein collagen and a hard mineral made of calcium and phosphate
Yellow Bone Marrow
in the center of a long bone; consists of stored fat and serves as an energy reserve for the body
connected bones (joints) that are positioned so they can't move; can protect internal organs better than any other type of joint
type of movable joint that allows a bone to pivot; like a skull moving from side to side on a vertabrae
type of movable joint that allows a bone to rotate and move back-and-forth and side-to-side; like a shoulder
type of movable joint that allow small bones to slide gently over one another; like a wrist
a smaller unit of a muscle fiber; made of repeating units called sarcomeres; has alternating dark and light bands
Myosin Head Function
1) the myosin heads bind to the thin filament - (actin) 2) myosin heads bend, pulling the actin filament toward the center of the sarcomere - 3) then ATP binds to each myosin head, releasing it from the actin filament - 4) myosin head is free to attach to another actin filament, further contracting the particular sarcomere