B10 Key Terms Flashcards
homeostasis
the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal and external changes
receptors
cells that detect stimuli - changes in the internal or external environment.
coordination centres
areas that receive and process information from receptors
effectors
areas (usually muscles or glands) that bring about responses in the body
neurones
basic cells of the nervous system that carry minute electrical impulses around the body
nerve
bundle of hundreds or even thousands of neurones
central nervous system (CNS)
the part of the nervous system where information is processed. It is made up of the brain and the spinal cord.
sensory neurone
neurone that carries impulses from the sensory organs to the central nervous system
motor neurones
carry impulses from the central nervous system to the effector organs
reflexes
rapid automatic responses of the nervous system that do not involve conscious thought
reflex arc
bring about a reflex action. They involve the sense organ, sensory neurone, relay neurone, and motor neurone