| A | B |
|---|
| joint | point at which one bone meets another |
| peripheral nervous system | brings information to the brain |
| how many types of tissues? | four |
| homeostasis | maintaining a constant internal environment |
| epithelium | tissue that covers the body's surface |
| macrophages | mobile immune system cells that engulf and digest "bad guys" |
| lymphocytes | immune system cells that make antibodies |
| fibroblasts | flat and irregularly shaped, most common connective tissue cells |
| collagen | strong protein that makes up one fourth of the protein in the body |
| cartilage | strong, flexible connective tissue that covers the ends of the bones |
| erthrocytes | red blood cells |
| neurons | nerve cells |
| glial cells | insulate neurons |
| dendrites | act as antennae for reception of nerve impulses |
| axon | carries nerve impulse away from the cell body |
| bone to bone | ligament |
| bone to muscle | tendon |
| organ system | group of organs that function together to carry out a major activity of the body |
| skeletal muscles | move endoskeleton |
| most common feedback loop | negative |
| body temperature regulation | hyppothalams |
| hormone | chemical messenger produced in one place of body and transported to another |
| ball-and-socket joint | shoulder |
| hinge joint | elbow |
| osteoporosis | bone density is lost and bones become brittle |
| flexors | bring bones closer together |
| extension | separates bones |
| compact bone | dense, almost solid bone |
| spongy bone | hardened fibers interspersed with spaces in the bone |
| red marrow | soft tissue that produces red blood cells |
| yellow marrow | tissue that stores fat found int he hollow interiors of the arm and leg bones |
| periosteum | membrane surrounding bones |
| osteoblasts | bone builders |
| osteocytes | mature bone cells |
| Haversian canal | hollow channel containing blood vessels surrounded by concentric rings of compact bone |
| subcutaneous tissue | layer of fat-rich cells beneath the dermis |
| epidermis | outermost layer of the skin |
| malignant melanomas | skin cancer that arises from melanocytes |
