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Mia Swangler
Physiology 1-7
| Term | Definition |
|---|---|
| Depolarization | When a stimulus causes the cell membrane to become less negative |
| All-or-nothing event | An action potential either happens completely when the threshold is reached, or not at all. |
| Neuron | an electrically excitable cell that transmits and receives signals throughout the body, acting as the basic building block of the nervous system. |
| Dendrites | These are branched extensions that receive signals from other neurons |
| Synapses | These are the communication points where one neuron's axon terminal meets another neuron's dendrite or cell body |
| Skeletal muscle | a type of striated muscle tissue that is responsible for voluntary movements and maintaining posture. |
| Myofibrils | Rod-like structures within muscle fibers that contain the contractile proteins actin and myosin |
| Sarcomeres | Repeating units of myofibrils that are responsible for muscle contraction. |
| Cardiac muscle | the involuntary, striated muscle tissue that forms the wall of the heart, responsible for pumping blood throughout the body. |
| Smooth muscle | muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control. |
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