What is the job of a sensory neurone?

It carries electrical impulses from a sensory receptor to the central nervous system.

What is the job of a motor neurone?

It carries electrical impulses from the central nervous system to an effector.

Where are relay neurones found and what do they do?

They lie inside the central nervous system and pass impulses from sensory neurones on to motor neurones.

A muscle or a gland that carries out the response when an impulse arrives from a motor neurone.

OCR GCSE Combined Science Biology J250

Cell Level Systems

Topic overview Microscopy, and sub-cellular structures DNA structure: polymer, double helix and nucleotides Enzyme action, and investigating enzymes Cellular respiration as an exothermic process Aerobic and anaerobic respiration compared Synthesis and breakdown of carbohydrates, proteins and lipids Photosynthesis: producers and the process Photosynthesis as endothermic, and investigating it Limiting factors in photosynthesis

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Organism Level Systems

The nervous system and coordinated responses

3 things to know
Paper 7 (Biology)

Overview

The central nervous system, what sensory, motor and relay neurones, receptors and effectors do, how sensory and motor neurones differ in shape, synapses and neurotransmitters, what a coordinated response is and why many receptors and connections help, the stages from stimulus to response, catching a falling glass, and why nervous responses are faster than hormonal ones.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Which two organs make up the central nervous system?

Key term

What is a sensory receptor?

Key term

What is an effector?

Questions from this subtopic

Each one with the model answer underneath.

1
Which two organs make up the central nervous system?
Model answer
The brain and the spinal cord.
2
What is the job of a sensory neurone?
Model answer
It carries electrical impulses from a sensory receptor to the central nervous system.
3
What is the job of a motor neurone?
Model answer
It carries electrical impulses from the central nervous system to an effector.
4
Where are relay neurones found and what do they do?
Model answer
They lie inside the central nervous system and pass impulses from sensory neurones on to motor neurones.
5
What is a sensory receptor?
Model answer
A cell that detects a stimulus such as light, sound, touch, temperature or a chemical, and starts an electrical impulse.
6
What is an effector?
Model answer
A muscle or a gland that carries out the response when an impulse arrives from a motor neurone.

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