Describe the reflex arc.
A stimulus (for example a pin) stimulates the receptor which causes a nerve impulse in the sensory neuron. The impulse travels to a synapse in the spinal cord, where chemicals diffuse across the gap in the synapse and stimulate an impulse in the relay neurone. This travels to another synapse and an impulse in the motor neurone, which travels to the effector, causing a response (for example moving hand)
SS
Related Biology GCSE answers
All answers ▸Where are chromosomes found? A.Cytoplasm B. Nucleus C. Ribosomes D. Vacuole
Name two types of effectors in the body, and the response that effector makes
Sophie accidentally puts her hand on an open flame, she immediately withdraws her hand. This is an example of a reflex reaction. Describe how a reflex reaction is coordinated.
How is the effectiveness of gaseous exchange surfaces in humans increased?