Chp 42 EXAM 4

Question 1

What are the 3 types of Glia cells and what are their functions? SLIDE 9

Answer 1

*Astrocytes- Metabolic support, form blood-brain barrier, maintain stable amount of ions
*Microglia- Immune functions, remove cellular debris
*Myelin Sheath- Glial cells wrapped around axons (forms insulating layer), interrupted by non-insulated nodes of Ranvier, produced by oligodendrocytes and Schwann cells

Question 2

There are three main types of neurons. What are they and how do their functions differ from one and another?

Answer 2

Sensory- Detect info from outer and inner conditions. Also called AFFERENT neurons (transmit to CNS)
Motor- Send signals away from CNS (EFFERENT neurons)
Interneurons- Form interconnections between other neurons. Critical for interpretation of info and response

Question 3

6. What is resting potential? How is it maintained (resting equilibrium met)?

Answer 3

Resting Membrane Potential- Unstimulated cell not sending action potentials

Question 4

Membrane potential-

Answer 4

*Difference in charge along inside and outside surfaces of cell membrane
*Ion concentrations differ between the inside and outside of the cell