Unit 2: Part 1B: Neural Transmission: Chemical

Question 1

Chemical Communication - Neurotransmitters

Answer 1

1. electrical zap causes vesicles in the axon terminal to wedge against the membrane
2. Vesicles (sac of NTs) released into the synapse
3. Dendrite has receptor sites (varies what they can take)
4. Not enough receptor sites for NTs
5. Unused NTs are recycled in reuptake

Question 2

Agonists

Answer 2

1. Mimic the NT and intensify the effect
2. Inhibitory messages inhibit more
3. Excitatory messages stimulate more

Question 3

Antagonists

Answer 3

1. Block signals and produce less or no effect of that NT
2. Decrease the NTs action

Question 4

Nervous System

Answer 4

the body’s speedy electrochemical communication network consisting of all the nerve cells of the PNS and CNS

Question 5

Autonomatic Nervous System - Sympathetic Nervous System

Answer 5

involuntary, arousing, dilates pupils, increase breathing/heart rate (fight), gets you going

Question 6

Autonomatic Nervous System - Parasympathetic Nervous System

Answer 6

involuntary, calming, contracts pupils, decrease breathing/heart rate (flight), calms you down

Question 7

Endocrine System

Answer 7

slow chemical communication system via hormones secreted in blood stream (food, sex, aggression)

Question 8

Hormones

Answer 8

chemical messengers that are manufactured by the endocrine glands travelling through the bloodstream and affect other tissues

Question 9

Difference between neurotransmitters and hormones

Answer 9

NTs: nervous system send messages quickly (text message)
Hormones: endocrine system send messages slower (letter in the mail)