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Flashcards in Nervous System Deck (46)
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1

Nerve net

Simple nervous system in invertebrates, diffuse mesh of simple branching nerve cells

2

Ganglia

Distinct Cluster of cell bodies of neurons

3

Neurons

Cells that make up nerves

4

Neuroglia

Nervous tissue cells that structurally and metabolically support neurons, can reproduce

5

Cell body

Nucleus and cytoplasmic components of cell

6

Dendrites

Signal input, slender extension from cell body of neuron

7

Axon

Action potentials, conductors, endings are transmitters

8

Sensory neurons

Detects stimulus and relays info about it

9

Motor (effector) neurons

Relays commands from brain or spinal cord to muscle and gland cells

10

Interneurons

Neuron of brain or spinal cord

11

Polarization

Sodium on outside, potassium on inside, signals transferred from neuron to neuron through action potential

12

Threshold

Minimum amount of change in resting membrane potential that will trigger an action potential

13

Action potential

Abrupt, brief reversal of resting membrane potential of neuron

14

Hyper polarization

Increase in charge difference of action potential

15

Sodium potassium pump

positive Sodium outside, negative potassium inside

16

Refractory period

Interval after an action potential where a patch of neural membrane in insensitive to stimulation

17

Axon bulb

Endings of axons, transmit signals

18

Neurotransmitter

Signaling molecules secreted by neurons, acts on cell next to it and then is degraded or recycled

19

Synaptic integration

Combining of all excitatory or inhibitory signals arriving at a neuron

20

Synapse

Gap between neurons,
Allows neuron to pass electric or chemical signal to another cell

21

Acetylcholine

Neurotransmitter in Cns and pns

22

Epinephrine

Hormone and neurotransmitter, strong emotions
Adrenaline

23

Norepinephrine

Neurotransmitter, increases heart rate and sugar level

24

Dopamine

Neurotransmitter, happy calm rewards

25

Serotonin

Neurotransmitter, sleep

26

Schwann cells

Neuroglia cell that Wraps around axons like a jelly roll

27

Myelin sheath

Series of Shwann cells

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Nodes of rancher

Breaks in myelin sheath

29

Salatory conduction

Action potentials jumping from node to node

30

Central nervous system

Brain and spinal cord