week3handoutanswerscorrections

week3handoutanswerscorrections - TA Eric Apaydin BIPN 100...

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TA: Eric Apaydin BIPN 100 Section: Thurs. 5-550, 6-650; Center 203 OH: Mon. 11, Weds. 1, Mandeville Coffee Cart BIPN 100 – Week 3 (Lectures 1/16 & 1/21) I. AP Conduction Larger axons conduct current well (they have a larger cross-sectional area and thus less resistance), but they taken up space. Myelination fixes this problem – it allows small axons to conduct as well as larger ones. Saltatory conduction is the process by which action potentials “jump” myelinated portions of axons to individual Nodes of Ranvier which propagate the AP. II. Types of Nervous Tissue White matter: is primarily composed of the myelin sheath (which has few mitochondria and therefore lacks color) Grey matter: composed of more mitochondria-rich neurons, and less myelin III. CNS Glial Cells Cell Type Location Function Satellite cells PNS Supports cell bodies Schwann cells Sec. neurotrophic factors, forms myelin sheaths Oligodendrocytes CNS Forms myelin sheaths Astrocytes Helps form blood/brain barrier & provides support for
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