Download Unit B6 Key Words

OCR 21st Century Science
Unit B6 Key Words
Nervous system and Reflex actions
1
Response
2
Stimulus
3
Simple reflex
4
6
Synapse
Pupil reflex
Newborn reflex
7
Receptor
8
Effector
Axon
5
9
10
11
12
13
14
15
A reaction of the muscles in the pupil to light.
The pupil contracts in bright light and relaxes
in dim light
A chemical messenger secreted by gland that
brings about a slow change in the body
A change in the environment that causes a
response
Cells that detect changes in the environment
The long tine part of a neuron
Tissues and organs in the body that control
the body’s responses to stimuli
A set of nerve impulses that causes a reflex
action
Made up of the brain and spinal cord
Fat wrapped around the outside of an axon.
Acts as an insulator
An action or behavior that is caused by a
Fatty sheath
stimulus
A neuron that carries impulses between the
Hormones
sensory and motor neurons
Reflex actions that occur for a short time in
Nervous system
new born babies
A neuron that carries impulses from the brain
Nerve impulse
to the effector
A neuron that carries impulses from the
Reflex arc
receptor cells to the brain of spinal cord
Central nervous system An automatic response made by an animal to a
stimulus
(CNS)
16
Relay neuron
17
Motor neuron
18
Sensory neuron
19
Peripheral nervous
system (PNS)
A network of nerves connecting the CNS to
the rest of the body
A tiny gap between neurons that transmits
nerve impulses from one neuron to another
using chemicals
Part of the body that carries out the response
(e.g. a muscle or gland)
Electrical signals carried by neurons (nerve
cells)
OCR 21st Century Science
Unit B6 Key Words
Nervous system and Reflex actions
1
Response
2
Stimulus
3
Simple reflex
4
6
Synapse
Pupil reflex
Newborn reflex
7
Receptor
8
Effector
Axon
5
9
A reaction of the muscles in the pupil to light.
The pupil contracts in bright light and relaxes
in dim light
A chemical messenger secreted by gland that
brings about a slow change in the body
A change in the environment that causes a
response
Cells that detect changes in the environment
5
11
2
7
The long tine part of a neuron
9
Tissues and organs in the body that control
the body’s responses to stimuli
A set of nerve impulses that causes a reflex
action
Made up of the brain and spinal cord
12
14
15
Fat wrapped around the outside of an axon.
Acts as an insulator
An action or behavior that is caused by a
Fatty sheath
stimulus
A neuron that carries impulses between the
Hormones
sensory and motor neurons
Reflex actions that occur for a short time in
Nervous system
new born babies
A neuron that carries impulses from the brain
Nerve impulse
to the effector
A neuron that carries impulses from the
Reflex arc
receptor cells to the brain of spinal cord
Central nervous system An automatic response made by an animal to a
stimulus
(CNS)
10
16
Relay neuron
18
17
Motor neuron
18
Sensory neuron
19
Peripheral nervous
system (PNS)
10
11
12
13
14
15
A network of nerves connecting the CNS to
the rest of the body
A tiny gap between neurons that transmits
nerve impulses from one neuron to another
using chemicals
Part of the body that carries out the response
(e.g. a muscle or gland)
Electrical signals carried by neurons (nerve
cells)
1
16
6
17
18
3
4
8
13