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MICHELLE CABRILLAS
ANATOMY WEEK 1-5
| Term | Definition |
|---|---|
| Homeostasis | The maintenance of a stable internal environment |
| Anatomical Position | The standard reference posture ( standing, feet forward, arms at sides, palms facing forward) |
| Organelle | A specialized structure within a cell that performs a specific funtion |
| Epithellium | A tissue composted of layers of cells that line internal and external surfaces |
| Dermis | The inner layer of the skin beneath the epidermis |
| Melanin | the pigment responsible for skin color that protects against UV radiation |
| Osteoblast | A cell that forms new bone |
| Epiphysis | The rounded end part of a long bone |
| Synovial Joint | A freely movable joint with a fluid-filled cavity |
| Meniscus | A cartilage structure within some joints (e.g. knee) that cushions and stabilizes |
| Striated Muscle | Muscle tissue with a banded appearance (skeletal or cardiac) |
| Myofibril | A rod-like unit within muscle cells made of actin and myosin filaments |
| Agonist ( Prime Mover) | The muscle that is primarily responsible for a movement |
| Antagonist | The muscle that opposes or reverses a movement |
| ATP (Adenosine Triphosphate) | The energy molecule used during muscle contraction |
| Sliding Filament Theory | the theory describing how actin slides past myosin to shorten muscle fiber |
| Neuron | A nerve cell that transmits electrical impulses |
| Synapse | The junction between neurons where chemical signals are passed |