1. Do what you can, with what you have, where you are.
1/3/2019
Title: Anat & Phys 11/8/06
Objectives:
To assess knowledge of the skeletal system and learn about the nervous system.
Class Topics
Review for Skeletal System Test
Nervous System
Do what you can, with what you have, where you are.
Theodore Roosevelt
Thursday, January 03, :18 AM

2. Class Assignments Skeletal System Test 11/8/06 Read 240-270
1/3/2019
Class Assignments
What
By When
Skeletal System Test 11/8/06
Read
Due this class period
Due next class period
Due in the future

3. 1/3/2019
Posttest Activities
Read

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5. Neuroglia (Figure 9-2) Astrocytes - CNS - control blood flow
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Neuroglia (Figure 9-2)
Astrocytes - CNS - control blood flow
ependymal cells - CNS - form CSF
Microglia - CNS - used to clean
Oligodendrocytes - CNS - used to speed up action potentials
Schwann cells - found in PNS - aids in conduction of action potential and helps large neurons

6. Neuron Parts Cell body Dendrites Axon
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Cell body
cytoplasm, nucleus (with nucleolus), and organelles
organelles including Nissl bodies (like RER) and lacking mitotic spindles
Dendrites
numerous
conduct action potential towards cell body
Axon
single
conduct action potential away from cell body
Neuron Parts

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8. Resting Membrane Potential
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Resting Membrane Potential
Difference in charge on inside and outside of plasma membrane
unequal distribution of ions
Ion channels
integral proteins that regulate ion movement in cell membrane
not only in nerve cells

9. Resting Membrane Potential (cont.)
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Resting Membrane Potential (cont.)
Ions most often found
Na+, K+
More sodium outside and potassium inside
this imbalance is kept by the sodium- potassium pump
uses energy to move the ions out/in the cell

10. Sodium-Potassium Pump
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Sodium-Potassium Pump
Forces Na+ out and K+ in the cell
Creates a concentration gradient
Na+ diffuses in and K+ diffuses out
Pump doesn’t work evenly
3 Na+ for every 2 K+
Creates an electrical gradient with more positive charges on the outside
K+ diffuses more readily than Na+
Increases the electrical gradient

11. Cell is at resting potential
1/3/2019
Inside the cell
Negatively charged
Lack of positive ions and presence of Cl- ions
Cell is at resting potential
Ready to go at stimulus
POLARIZED
Voltage
About –70 mV (millivolts)
Very small amount
A D battery has about 1.5 volts