AQA GCSE Biology Paper 2 100% Correct Answers Verified questions 2023/2024

What is homeostasis? - answer The maintenance of a constant internal environment. What is a stimulus? - 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? - answer Detect the stimulus or change in environment. What happens after the receptors? - answer Receptors send messages to the CNS via the sensory neurone. What makes up the central nervous system? - answer The brain or spinal cord What is an effector? - answer Muscles or glands that bring about a response. What do the muscles and glands do in response to stimuli? - answer Muscles contract and glands secrete chemical substances(hormones). What is a sensory neurone? - answer A neurone that carry information from the receptors to the CNS. What is a relay neurone? - answer Neurones that carry impulses from the sensory neurone to the motor neurone. What is a motor neurone? - answer Neurones that carry information from the CNS to the effectors. What is the nervous system? - answer It is a system that allows you to react to your surroundings.