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“Weeks 1–6 A&P
“Body Systems and Nervous System Study Guide”
| Question | Answer |
|---|---|
| What is homeostasis? | The body’s ability to maintain a stable internal environment despite external changes. |
| What is the function of the autonomic nervous system? | It controls involuntary functions like heart rate, digestion, and breathing. |
| What are the three phases of an action potential? | Depolarization, repolarization, and hyperpolarization. |
| What ion leaves the neuron during repolarization? | Potassium (K⁺) leaves the neuron. |
| What ion enters the neuron during depolarization? | Sodium (Na⁺) enters the neuron. |
| What are the two divisions of the autonomic nervous system? | The sympathetic (“fight or flight”) and parasympathetic (“rest and digest”) systems |
| What is the all-or-none principle? | Once threshold is reached, an action potential fires completely or not at all. |
| What is the function of the cell membrane? | It controls what enters and leaves the cell and helps maintain homeostasis. |
| What is the main function of ribosomes? | They are the site of protein synthesis. |
| What are electrolytes? | Minerals in body fluids that carry an electrical charge, such as sodium, potassium, and calcium. |
Created by:
shontelle23