3A.1.1, 3A.1.2, 3A.1.3 Flashcards Preview

Psychology > 3A.1.1, 3A.1.2, 3A.1.3 > Flashcards

Flashcards in 3A.1.1, 3A.1.2, 3A.1.3 Deck (26):
1

Sensory neuron

Neurons that carry incoming information from the sensory receptors to the brain and spinal cord

2

Motor neutron

Neurons that carry outgoing information from the brain and spinal cord to the muscles and glands

3

Interneurons

Neurons within the brain and spinal cord that communicate internally and intervene between the sensory inputs and motor inputs

4

Dendrite

The bushy, branching extensions of a neuron that receive messages and conduct impulses toward the cell body

5

Axon

The extension of a neuron, ending in branching terminal fibers, through which messages pass to ther neurons it to muscles or glands

6

Axons ____ dendrites _____

Speak, listen

7

Myelin sheath

A layer of fatty tissue segment ally encasing the fibers of many neurons; enables vastly greater transmission speed of neutral impulses as the impulse hops from one node to the next

8

A neutral impulse travels at....

speeds ranging from 2 mph to 200 mph

9

Your brain is more complex that a computer....

But slower at executing simple responses

10

Action potential

A neural impulse; a brief electrical charge that travels down an axon

11

Neurons generate electricity from...

Chemical events

12

Chemistry to electricity process...

Involves the exchange of ions

13

Inside of an axon is _____, the membrane is ____

Negatively charged, positively charged

14

Selectively permeable

Selective about what it lets in

15

Each neuron is like a....

Mini-decision making device

16

Excitatory:_____ inhibitory:________

Accelerator; brake

17

Threshold

The level of stimulation required to trigger a neural impulse

18

If excitatory exceeds inhibitory....

It triggers an action potential

19

Synapse

The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. The tiny gap at this junction is called the synaptic gap or synaptic deft

20

Dendrites and axons....

Don't touch

21

Neurotransmitters

Chemical messengers that cross the synaptic gaps between neurons. When released by the sending neuron, neurotransmitters travel across the synapse and bind to receptor sites on the recovering neuron, thereby influencing whether that neuron will generate a neural impulse

22

Reuptake

A neurotransmitter's reabsorption by the sending neuron

23

Acetylcholine

The messenger at every junction between a motor neuron and skeletal muscle

24

Endorphins

"Morphine within"; natural opiatelike neurotransmitters linked to pain control and to pleasure

25

Antagonists

Bind receptors but instead blocks a neurotransmitter's functioning

26

Neuron

A nerve cell; the basic building block of the nervous system