nervous system and reflex actions Flashcards
Cells which are sensitive to light are found in …
The eyes
Hormones are chemical compounds are ….
secreted by glands.
Bundles of neurones are known as …
nerves.
Some processes in the body are …
controlled by hormones.
Muscles and glands are known as
effector organs.
The nervous system lets the body …
react to stimuli and coordinate behaviour.
Between each neurone there is a small gap across which an impulse must “jump”.
What is the name given to this gap?
synapse
eurones carry electrical impulses. How is an impulse carried across the gaps between neurons?
By chemicals/chemical transmitters
One type of effector is muscles. What are the other types of effectors?
glands
The diagram shows a reflex arc using a reflex action which would move your hand away from a hot object.
Labels C, D and F correspond to three neurones.
What are their names?
C = sensory neurone D = relay neurone F = motor neurone
In the reflex arc, what would label A represent?
stimulus/hot object
What does label B correspond to?
sensory receptors
n what organ would you find B?
Skin
What would label H correspond to?
The effector/muscle
What does label E correspond to?
synapse
How does an impulse pass across E?
By a chemical/neurotransmitter
Many drugs act as painkillers.
Which part of the reflex arc are they likely to act on?
E/synapse
