when an electrical transmission goes wrong

Question 1

myelination is performed by which 2 glial cells

Answer 1

schwann cells
oligodendrocytes

Question 2

myelination

Answer 2

• the 2 glial cells contain fatty tissue called myelin that wraps around the neuron acons
• schwann cells wrap individual axons
• oliodendrocytes wrap several axons

Question 3

unmyelinated

Answer 3

• AP causes the passive spread of the current
• depolarisation adjacent membrane

Question 4

myelinated

Answer 4

• myelin stops leakage of ions across the membrane
• AP only retriggered at each node
• saltatory conduction

Question 5

advantages of myelination

Answer 5

• speed: faster than unmyelinated
• economy: less Na- enters during AP’s - which need to be removed with ATP

Question 6

reasons for demyleination

Answer 6

• hereditary
• infections
• immune disorders
• nutritional deficiencies
• drugs or medications