B5- Synapses And Reflexes Flashcards
What is the connection between two neurones called?
Synapse
How is the nerve signal transferred across a synapse?
By chemicals which diffuse across the gap
What happens after chemicals diffuse across the synapse?
They set off a new electrical signal in the next neurone
What is the purpose of reflexes in the body?
Help prevent injury
Fill in the blank: The passage of information in a reflex is called a _______
Reflex arc
Where do the neurones in reflex arcs go through?
The central nervous system
What is the first step when a painful stimulus is detected?
Impulses are sent along the sensory neurone
What is the role of relay neurones in reflex actions?
Connect sensory neurones to motor neurones
What triggers the release of chemicals at the synapse in a reflex arc?
Impulses reaching the synapse
What happens when impulses reach muscle in a reflex arc?
The muscle contracts
True or False: Reflex actions require conscious thought.
False
What chemical is released automatically in response to a shock?
Adrenaline
What is the sequence of neurones involved in a reflex arc?
Sensory neurone → Relay neurone → Motor neurone
Fill in the blank: Impulses travel along the _______ to the effector.
Motor neurone
What is the effect of reducing light entering the eye via reflex?
Stops the eye from getting damaged
