C11 Csyn v Esyn

Question 1

Electrical Synapse - Structure

Answer 1

Gap Junction

Question 2

Electrical Synapse - Speed of transmission

Answer 2

0.1 msec

Question 3

Electrical Synapse - Population

Answer 3

Rare - Retina, brain stem (respiration), Heart, some smooth muscle

Question 4

Electrical Synapse - Direction

Answer 4

Bidirectional

Question 5

Electrical Synapse - Size of signal

Answer 5

Always the same

Question 6

Electrical Synapse - Chemicals

Answer 6

Ions (Na+/K+)

Question 7

Chemical Synapse - Structure

Answer 7

Syanptic vessicles/Synaptic cleft/Postsynaptic receptor

Question 8

Chemical Synapse - Speed of transmission

Answer 8

0.3-0.5 msec (synaptic delay)

Question 9

Chemical Synapse - Population

Answer 9

Most common

Question 10

Chemical Synapse - Direction

Answer 10

Unidirectional

Question 11

Chemical Synapse - Size of signal

Answer 11

Size varies (more or less neurotansmitters)

Question 12

Chemical Synapse - Chemicals

Answer 12

Neurotransmitters

Question 13

Explain how refractory periods influence 3 properties of APs.

Answer 13

• All or nothing - Because of the refractory period, AP’s can’t summate
• Frequency of AP’s - The refractory period sets a theoretical limit because in that 1ms another AP can’t fire.
• Unidirectional - During refractory period, the region behind the impulse is already repolarizing, therefore it can’t go backwards.