neurons and synaptic transmissions

Question 1

how may neurons are there in the human nervous system

Answer 1

100 billion

Question 2

what percent of neurons are located in the brain

Answer 2

• 80%

Question 3

what are the 3 types of neurons

Answer 3

• sensory
• relay
• motor

Question 4

what does the cell body include

Answer 4

nucleus which contains genetic material of the cell

Question 5

what are dendrites

Answer 5

• branchlike structures protruding form cell body
• carry nerve impulses from neurons to the cell body

Question 6

what are axons

Answer 6

• carry nerve impulses away form the cell body

Question 7

what are myelin sheath

Answer 7

• fatty layer that protects the axon
• speeds up the electrical transmission if the impulse

Question 8

nodes of ranvier

Answer 8

• gaps in the myelin sheath
• speed up rate of transmission by forcing the impulse to jump across the gaps

Question 9

what are terminal buttons

Answer 9

• a the end of axons
• communicate wit the next neuron

Question 10

the firing o a neuron

Answer 10

• when a neuron is in resting state the inside of the cell is negatively charged compared to the outside
• when a neuron is activated by a stimulus the inside of the cell becomes positively charged for a split second causing the action potential to occur
• this creates an electrical impulse that travels doom the axon towards the end of the neuron

Question 11

what is synaptic transmission

Answer 11

• the process by which neighbouring neurons communicate with each other by sending chemical message across the synapse