Brain and Nervous System (Grey Matter)

Question 1

Acetylcholine

Answer 1

Main neurotransmitter of the somatic nervous system

Question 2

Action potential

Answer 2

Change in voltage across a neurone’s cell membrane during passage of an impulse

Question 3

All-or-nothing

Answer 3

Property of a neurone in which an action potential either does or does not occur

Question 4

Autonomic nervous system

Answer 4

Parts of the nervous system not under voluntary control

Question 5

Auxin

Answer 5

Type of plant hormone

Question 6

Axon

Answer 6

Long, thin extension of a neurone carrying impulses away from the cell body

Question 7

Cell body

Answer 7

Part of a neurone containing the nucleus and most of the other
organelles

Question 8

Central nervous system (CNS)

Answer 8

Brain and spinal cord

Question 9

Dendrites

Answer 9

Fine branches of a neurone which conduct impulses towards the cell body

Question 10

Depolarised/depolarisation

Answer 10

Local reversal of electrical charges across a neurone’s cell membrane as an impulse passes along it

Question 11

Dorsal route ganglion

Answer 11

Widening of a nerve just before it enters the spinal column, where sensory neurone cell bodies are found

Question 12

Grey matter

Answer 12

Interior parts of spinal column and outer layer of the brain, where neurones’ cell bodies are found

Question 13

Indoleacetic acid (IAA)

Answer 13

An auxin

Question 14

Motor neurone

Answer 14

Transmits nerve impulses from the central nervous system to effector muscle or gland