BIO 150 Chapter Notes - Chapter 48-49: Resting Potential

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Pns: all nerves radiating off spinal cord and brain. Division: uses epinephrine to signals its target organs to respond (prepares body for action = increases heart rate, breathing) Division: uses acetylcholine to signals its target organs (slows the body down; body at rest = lower heart rate, breathing) Typically between -60 mv and -80 mv. Maintained by: sodium ion channels, potassium ion channels, sodium potassium pumps. Responsible for net movement of ions across the membrane when the cell is at rest (resting membrane potential) Keep inside of cell membrane with a negative charge and outside of cell membrane with a positive charge for resting membrane potential. Resting ion channels in the membrane affect the electrical charge of the membrane. Potassium and sodium ions are moving across the membrane and this results in a resting membrane potential of about -60 to -80 mv. Is open when cell is at rest: resting na+ channel. Allows only sodium ions through (selectively permeable)

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