GCSE AQA Biology Homeostasis Practice Test Questions With Complete Solution

GCSE AQA Biology Homeostasis Practice Test Questions With Complete Solution What is homeostatis? - CORRECT ANSWERS The regulation of the conditions in our body maintaining stable internal environment What does it do? - CORRECT ANSWERS Responds to any change in internal or external conditions What are the 3 main components in automatic control systems? - CORRECT ANSWERS Receptors, coordination centres and effectors What is a stimulus? - CORRECT ANSWERS A change in your environment than requires a response Give some examples of stimuli? - CORRECT ANSWERS Light, sound, touch, pressure, pain, chemical or temperature What do the receptors do? - CORRECT ANSWERS Detect the stimulus when either temp or water is high or low What happens after the receptors? - CORRECT ANSWERS Receptors send messages to the cns which organise a response to the effector Give examples of the central nervous system? - CORRECT ANSWERS The brain or spinal cord How is the CNS connected to the rest of the body? - CORRECT ANSWERS Through sensory and motor neurones What is an effector? - CORRECT ANSWERS Muscles or glands that bring about a response What do the muscles and glands do in response? - CORRECT ANSWERS Muscles contract and glands secrete chemical substances(hormones) What is a sensory neurone? - CORRECT ANSWERS Neurones that carry information from the receptors to the cns What is a relay neurone? - CORRECT ANSWERS Neurones that carry impulses from the sensory to the motor neurones What is a motor neurone? - CORRECT ANSWERS Neurones that carry information from the cns to the effectors What is the nervous system? - CORRECT ANSWERS It is what allows you to react to your surroundings What is a synapse? - CORRECT ANSWERS 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 ANSWERS The passage of the information, that brings around a response Responses that reduce body temp- - CORRECT ANSWERS Hairs lie flat, sweat and blood vessels get wider(vasodilation) Responses that increase body temp- - CORRECT ANSWERS Hairs stand up, no sweat, shivering and blood vessels constrict(vasoconstriction) What is the body's core temp? - CORRECT ANSWERS 37 degrees c What is the sclera? - CORRECT ANSWERS The tough supporting wall of the eye What is the cornea? - CORRECT ANSWERS Outer layer, bends light into the eye What is the pupil? - CORRECT ANSWERS The hole in the centre where light enters What is the iris? - CORRECT ANSWERS Controls the diameter of the pupil and how much light enters What is the retina? - CORRECT ANSWERS Contains receptor cells- one sensitive to light intensity and the other is colour What is the lens? - CORRECT ANSWERS Focuses the light into the retina What is the ciliary muscles and suspensory ligaments? - CORRECT ANSWERS Control shape of the lens What is the optic nerve? - CORRECT ANSWERS Carries impulses from the receptors on the retina to the brain