AQA GCSE Biology Paper 2 QUESTIONS & ANSWERS

What is homeostasis? - CORRECT ANSWER-The maintenance of a constant internal environment. What is a stimulus? - CORRECT ANSWER-A change in your environment than requires a response. e.g Light, sound, touch, pressure, pain, chemical or temperature. What do the receptors do? - CORRECT ANSWER-Detect the stimulus or change in environment. What happens after the receptors? - CORRECT ANSWER-Receptors send messages to the CNS via the sensory neurone. What makes up the central nervous system? - CORRECT ANSWER-The brain or spinal cord What is an effector? - CORRECT ANSWER-Muscles or glands that bring about a response. What do the muscles and glands do in response to stimuli? - CORRECT ANSWER-Muscles contract and glands secrete chemical substances(hormones). What is a sensory neurone? - CORRECT ANSWER-A neurone that carry information from the receptors to the CNS. What is a relay neurone? - CORRECT ANSWER-Neurones that carry impulses from the