L5

Question 1

What are synapses

Answer 1

Small spaces between neurons or between neurons and effectors

Question 2

What is a neurotransmitter

Answer 2

Chemical messenger made my neurons to carry a neural signal from one neuron to another, or from a neuron to an effector

Question 3

Describe synapses

Answer 3

Neurotransmitters released from presynaptic neuron diffuse across synaptic cleft, bind to receptors, and depolarize dendrites on postsynaptic neuron

Question 4

What is acetylcholine

Answer 4

Acts as an excitatory neurotransmitter by opening Na+ Chanel’s

Question 5

What is cholinesterase

Answer 5

Enzyme released by presynaptic membrane destroys acetylcholine—> Na+ channels close —> neuron recovery stage

Question 6

What do inhibitory neurotransmitters do?

Answer 6

Make postsynaptic membrane more permeable to K+

Question 7

What is summation?

Answer 7

Effect produced by by accumulation of neurotransmitters from two or more neurons

Question 8

What are neurotoxins?

Answer 8

Bacterial proteins that are exocytosed into nerve endings where they inhibit the release of essential neurotransmitters