2022 Aqa Gcse Biology Paper 2: Exam And Study Guide/preparation

2022 AQA GCSE BIOLOGY PAPER 2: EXAM AND STUDY GUIDE/PREPARATION Question and ANSWER What is homeostasis? - ANSWER: Homeostasis is the maintenance of a constant internal environment in order to maintain optimum conditions for enzyme and cellular function. Give examples of conditions maintained by homeostasis in the body - ANSWER Blood glucose concentration Body temperature Water levels What two types of responses are used in body control systems? - ANSWER: Nervous and chemical What three components do all control systems have? - ANSWER Receptors Coordination centres Effectors What is the function of a receptor? -ANSWER: Receptors detect changes in the environment (stimuli). What is the function of a coordination centre? - ANSWER: Coordination centres obtain and process information from receptors. What is the function of an effector? - ANSWER: Effectors (muscles or glands) bring about responses to stimuli. What is the function of the nervous system? - ANSWER: The nervous system allows the body to react to its surroundings and coordinate an appropriate response. How does a stimulus lead to a response being carried out by the body? - ANSWER Stimulus is converted into an electrical impulse by the receptors. The electrical impulse passes along sensory neurones to the central