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Biology 12: Nervous System > Across > Flashcards

Flashcards in Across Deck (31)
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1

A neurotransmitter released in response to the parasympathetic nervous system- puts you into a relaxed state

Acetylcholine

2

The brain stem

Medulla Oblongata

3

The portion of the brain responsible for maintaining homeostasis within the body

Hypothalamus

4

The dorsal root looks different then that central root due to the presence of an enlargement called WHAT

The dorsal root ganglion

5

The void running down the centre of the spinal cord

Central canal

6

The dorsal root conducts nerve impulse IN WHAT DIRECTION

Towards the spinal cord

7

Shorter branches of a neutron which receive nerve impulses

Dendrite

8

CNS

Central nervous system

9

Occurs when sodium and potassium ions are being returned to their resting potential concentrations

Refractory period

10

During resting potential, WHAT is the most common ion inside cell

Potassium

11

Contain the neurotransmitters within the axon ends

Synaptic vesicles

12

During resting potential, WHAT is the most common ion outside the cell

Sodium

13

The central root conducts nerve impulses IN WHAT DIRECTION

Away from spinal cord

14

Another word for “sensory” neuron

Afferent/ motor

15

Nerves are bundles of individual cells called

Neurons

16

2 components of the CNS

Brain
Spinal cord

17

The coated portions of the axon are called WHAT

Schwann cells

18

Another word for “motor” neuron

Efferent

19

The voltage inside a neuron at resting potential

Approx. -70mV

20

WHAT are at the end of the axon

Axon terminals

21

3 protective membranes around the spinal cord

Meninges

22

The space between the axon ends of one nerve cell and the dendrites of a neighbouring cell

Synapse/ synaptic cleft

23

The portion of the nervous system which produces the “fight or flight” response

Sympathetic

24

WHAT are breaks between myelinated sections of the axon

Nodes of ranvier

25

The portion of the cerebrum responsible for thinking

Frontal

26

The portion of the cerebrum responsible for vision

Occipital

27

A chemical that is released to transmit a nerve impulse from one nerve cell to the next

Neurotransmitters

28

The portion of the nervous system which is “involuntary” (not under your conscious control)

Autonomic

29

After an action potential, sodium and potassium are returned to their resting potential state by the process of

Active transport

30

The central part of the neuron, where most activities related to the maintenance of the cell occur

Cell body