AQA GCSE Biology Homeostasis Exam Questions With All Correct Answers

AQA GCSE Biology Homeostasis Exam Questions With All Correct Answers What is homeostatis? - CORRECT ANSWER The regulation of the conditions in our body maintaining stable internal environment What does it do? - CORRECT ANSWER Responds to any change in internal or external conditions What are the 3 main components in automatic control systems? - CORRECT ANSWER Receptors, coordination centres and effectors What is a stimulus? - CORRECT ANSWER A change in your environment than requires a response Give some examples of stimuli? - CORRECT ANSWER Light, sound, touch, pressure, pain, chemical or temperature What do the receptors do? - CORRECT ANSWER Detect the stimulus when either temp or water is high or low What happens after the receptors? - CORRECT ANSWER Receptors send messages to the cns which organise a response to the effector Give examples of the central nervous system? - CORRECT ANSWER The brain or spinal cord How is the CNS connected to the rest of the body? - CORRECT ANSWER Through sensory and motor neurones What is an effector? - CORRECT ANSWER Muscles or glands that bring about a response What do the muscles and glands do in response? - CORRECT ANSWER Muscles contract and glands secrete chemical substances(hormones) What is a sensory neurone? - CORRECT ANSWER Neurones that carry information from the receptors to the cns What is a relay neurone? - CORRECT ANSWER Neurones that carry impulses from the sensory to the motor neurones What is a motor neurone? - CORRECT ANSWER Neurones that carry information from the cns to the effectors What is the nervous system? - CORRECT ANSWER It is what allows you to react to your surroundings What is a synapse? - CORRECT ANSWER It is the nerve signal being transferred by chemicals which move across the gap, sending a electrical signal to the next neurone What is a reflex arc? - CORRECT ANSWER The passage of the information, that brings around a response Responses that reduce body temp- - CORRECT ANSWER Hairs lie flat, sweat and blood vessels get wider(vasodilation)