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EstherT. Set 1
Human Physiology: Weeks 1–6
| Term | Definition |
|---|---|
| Homeostasis | The body’s ability to maintain a stable internal environment so all systems can work properly. |
| Negative Feedback Loop | A control process that reverses a change to bring the body back into balance (ex: sweating to cool the body). |
| Cell Membrane | The thin outer layer of a cell that controls what enters and leaves to keep internal conditions stable. |
| Osmosis | The movement of water through a membrane from low solute concentration to high solute concentration. |
| ATP (Adenosine Triphosphate) | The main energy molecule that cells use for muscle movement, transport, and chemical reactions. |
| Epithelial Tissue | Tissue that covers body surfaces and lines internal organs and cavities to protect and absorb. |
| Osteoblast | A bone cell that builds new bone tissue and helps in bone growth and repair. |
| Actin and Myosin | Protein filaments inside muscle fibers that slide past each other to cause muscle contraction. |
| Neuromuscular Junction | The place where a motor neuron and a muscle fiber meet so a signal can cause contraction. |
| Neuron | A nerve cell that sends and receives electrical and chemical signals through the nervous system. |
| Synapse | The tiny gap between two neurons where neurotransmitters carry a signal to the next cell. |
| Action Potential | A brief electrical signal that travels along a neuron when it is activated to send information. |