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Physiology Wk 1-6
| Question | Answer |
|---|---|
| What is physiology? | The study of how the body’s structures function to maintain life. |
| What is homeostasis? | The process by which the body maintains a stable internal environment despite changes in the external environment. |
| What is negative feedback? | A control mechanism where a change triggers a response that reverses the original stimulus to maintain balance. |
| What is positive feedback? | A mechanism where a change causes responses that amplify the original stimulus. |
| What is the function of the plasma membrane? | It regulates what enters and leaves the cell, maintaining the internal environment. |
| What is the difference between diffusion and osmosis? | Diffusion is the movement of molecules from high to low concentration; osmosis is the movement of water across a semipermeable membrane. |
| What are the main components of a feedback system? | Receptor, control center, and effector. |
| What is the resting membrane potential? | The electrical charge difference across a cell membrane when the cell is at rest, usually around -70 mV. |
| How do enzymes speed up chemical reactions? | By lowering the activation energy required for reactions to occur. |
| What is ATP and why is it important? | Adenosine triphosphate (ATP) is the main energy currency of the cell, providing power for cellular processes. |
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