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 Biology A J247

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

Community Level Systems

Topic overview Cycling materials, and the role of microorganisms The carbon and water cycles, and decomposition Levels of organisation, and abiotic and biotic factors Interdependence, competition and trophic levels Pyramids of biomass and the efficiency of transfer

Genes, Inheritance and Selection

Topic overview Genetic terms, and the genome Genome, environment and mutations Asexual and sexual reproduction compared Haploid, diploid and meiosis Single gene inheritance and Punnett squares Sex determination, multiple genes and Mendel's work Variation within a population, and classification Natural selection and evolution Evidence for evolution, and the work of Darwin and Wallace

Global Challenges

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Organism Level Systems

Topic overview The nervous system and coordinated responses The reflex arc The eye and its common defects The structure and function of the brain Hormones and the endocrine glands Hormones in reproduction and the menstrual cycle Methods of contraception Tropisms, auxin and the roles of plant hormones Homeostasis, and the skin in temperature control Insulin and the control of blood glucose Type 1 and type 2 diabetes Osmotic changes in body fluids, and the kidneys Kidney structure and the parts of the tubule

Scaling Up

Topic overview Diffusion, osmosis and active transport Mitosis, the cell cycle and cell differentiation Stem cells in animals and meristems in plants Surface area to volume ratio and exchange surfaces The circulatory system, the heart and blood vessels Red blood cells and plasma Root hair cells, transpiration and translocation Xylem and phloem Factors affecting water uptake, and the potometer

Organism Level Systems

The nervous system and coordinated responses

3 things to know
Paper 1

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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Cell Level Systems

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