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Henrietta O Nwaobi
Physiology Week 1 -6
| Question | Answer |
|---|---|
| What is diffusion? | The movement of molecules from an area of higher concentration to an area of lower concentration. |
| How is active transport different from passive transport? | Active transport requires ATP to move substances against their concentration gradient. |
| What is the function of the sodium-potassium pump? | It moves 3 Na⁺ out of and 2 K⁺ into the cell, helping maintain the resting membrane potential. |
| What is the resting membrane potential of a neuron? | Approximately -70 millivolts (mV), maintained by ion pumps and membrane permeability. |
| What is threshold potential? | The membrane voltage that must be reached to trigger an action potential (around -55 mV). |
| What are ligand-gated ion channels? | Ion channels that open in response to a chemical messenger (ligand) binding to them. |
| What are stretch-activated ion channels? | Channels that open when the cell membrane is mechanically deformed, such as during touch or pressure. |
| What is a graded potential? | A small, local change in membrane potential that can lead to an action potential if strong enough. |
| What are the three types of muscle tissue? | Skeletal, cardiac, and smooth muscle. |
| What is the neuromuscular junction? | The synapse between a motor neuron and a muscle fiber where acetylcholine triggers muscle contraction. |
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hetti4real