What is a reflex arc and why is it important?
A reflex arc is made up of a receptor (which detects a stimulus), a sensory neurone, a relay neurone, a motor neurone and an effector (which brings about a response). The neurones are not joined to each other, there is a small gap between them called a synapse. Impulses travel through the reflex arc and cross the synapse by means of a chemical diffusing through the gap.The reflex arc brings about a reflex action, which is a fast, automatic response to a stimulus. This is important as it helps us avoid harm or danger.
JB
Related Biology GCSE answers
All answers ▸In the food web shown: Heather -> Rabbit -> Fox, only a small percentage of the Sun’s energy captured by the heather is eventually incorporated into the body tissues of the fox. Explain what happens to the rest of the energy captured by the heather.
what are the risk factors for coronary heart disease and what is it?
Bob and Brenda are both heterozygous for a genetically inherited recessive trait. (a) Calculate the probability that they would have a healthy child. Use a genetic diagram to help. (b) Suggest an example of a recessive inherited disorder
Two people who are heterozygous for retinitis pigmentosa are expecting a baby. Draw a genetic diagram to calculate the probability that the baby will have the condition. Use R for the normal allele and r for the allele for retinitis pigmentosa.