keeping it on your finger and wrapping it around your finger eiii8 Satellites

Keeping it on your finger and wrapping it around your

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keeping it on your finger and wrapping it around your finger” e.iii.8. Satellites cells e.iii.8.a. Found in PNS e.iii.8.b. Similar to astrocytes e.iii.8.c. They are support cells, surround cell bodies and ganglia e.iii.9. Schwann cells e.iii.9.a. Found in PNS e.iii.9.b. Myelination of the peripheral nervous system e.iii.9.c. Can only myelinate one at a time e.iv. Acorite plexus e.iv.1. Manufacture, secrete, and monitor spinal cord fluid e.iv.2. Cerebrum spinal fluid e.iv.2.a. Prevents the skull from being crushed along with the spinal cord e.v. Internode and Node e.v.1. Internode where is there is myelin e.v.2. Node where there isn’t myelin e.vi. Blood- brain barrier – made of endothelium of blood vessels, pedicles of astrocytes and basement membrane 4. Neurophysiology a. The Resting Membrane Potential a.i. Passive forces a.i.1. Chemical gradients a.i.1.a. Potential energy a.i.1.b. Resistance
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a.i.1.b.i. Bilayer is a resistor a.i.1.c. Potassium leak channels a.i.1.c.i. When potassium leaves, it causes a current which all leads to the RMP a.i.1.c.ii. Plasma membrane can actually store a charge a.i.2. Electrical gradients a.i.2.a. Capacitance a.i.2.a.i. The ability to hold a charge i.e. lipid bilayer membrane a.i.3. Electrochemical gradient a.ii. Active Forces a.ii.1. Sodium potassium pump a.ii.2. 3 sodium out, 2 potassium in b. Changes in transmembrane potential b.i. Ligand gated channels b.ii. Voltage gated channels b.ii.1. Opens when there is a change in voltage in the plasma membrane b.ii.2. When you polarize the membrane, the inside of the cell is less negative so the gate opens b.ii.3. Extracellular gate b.ii.3.a.Activation gate b.ii.4. Intracellular gate b.ii.4.a.Inactivation gate b.iii. Mechanical gated channel c. Graded (intensity) Potentials (- local potentials) c.i. Dendrites contain ligand gated channels
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c.ii. Stimulus, acetychloride, binds to the ligand gate which causes the gate to open leads to a graded potential c.iii. The distribution and importance of graded potential c.iii.1. Axon hillock c.iii.1.a. “the brain area of the nerve” c.iii.1.b. The integration area of the nerve c.iii.2. Initial segment of an axon c.iii.2.a. Originates action potential c.iii.2.b. Contains voltage gated channels c.iii.3. Spike initiation zone c.iii.3.a. Sodium is coming into the axon hillock c.iii.4. Local potential/graded potential c.iii.4.a. Occurs as a result of ligand gated channels c.iii.4.b. Less widespread, change in membrane potential doesn’t go very far c.iii.4.c. Chloride ions coming in means you getting hyperpolarized c.iii.4.d. Sodium and calcium come in means you are getting depolarization c.iii.4.d.i. More sodium getting in means more depolarization c.iii.5. Action potential c.iii.5.a. Spatial summation – spreading the action potential over the cell body c.iii.5.b. Temporal summation – increasing the action potential over time (constantly firing action potential in a cell body) c.iii.5.c. Can be spread all along an axon c.iii.5.d. Occurs due as a result of voltage gated channels
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c.iii.5.e.
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