Quiz 7 Flashcards
Why do reflex actions not involve the brain?
To ensure they are fast enough to avoid harm
What is meant by the term synapse?
A gap between 2 neurones
What can glands do in response to stimulus’s?
Secrete hormones
What are the 3 types of neurone?
Sensory neurone,relay neurone and motor neurone
In the human body,what are the receptors?
Cells which detect stimuluses
What does the term neurone?
A specialised nerve cell that carries electrical signals
What are 5 main stages in the general process for human response to external events?
Stimulus
Receptor
Coordinator
Effector
Response
What type of neurone are found inside coordinators to control the correct response?
Relay neurones
What is released at the end of neurone in order to cross a synapse?
Neurotansmitter(chemical message)
What are the 5 main stages in the sequence for a reflex arc?
Stimulus
Receptor
Spinal cord
Effector
Response
What happens when a neurotransmitter crosses a sysnapsw and reaches a second neurone?
A new electrical signal is stimulated
Give 2 coordinators in the central nervous system
Brain,spinal cord
What type of neurone connects the coordinator to the effector?
Motor neurone
Give 2 effectors in the nervous system
Muscles,glands
Describe the steps in carrying out an investigation into the impact of a certain facotr(like caffeine consumption) on reaction time
Person 1 holds the ruler above the open hand of person 2 so the 0 mark is level with the top hand
Drop the ruler and have person 2 catch it as fast as they can
Record what the ruler caught
Repeat 10 times
Calculate a mean(average)
Repeat with person 2 dropping the ruler and person 1 catching i.
Convert the distance measurements into time
Have person 1 and 2 drink caffeine.
Repeat steps 1-6
What is meant by the term stimulus?
A change in internal or external environment
What can muscles do in response to stimulus’s?
Contract
What is the function of the nervous system?
To enable humans to react to their surroundings
What are the features of a reflex action?
Automatic,fast
What is the role of a relay neuron in a reflex arc?
Transfers the electrical impulse from the sensory neurone to the motor neurone within the spinal cord
What is the role of the sensory neuron in a reflex arc?
sensory carry information from receptors throughout the body to the central nervous system(spinal chord)
What is the central nervous system
brain and spinal chord
What is the role of the motor neurone in a reflex arc?
The motor neurone carries the electrical impulse from the spinal chord to an effector e.g. muscles to contract
what is a reflex action?
An automatic response
