Nervous system Flashcards
Define ‘homeostasis’.
Maintainence of a constant internal environment relatively stable at optimum conditions through negative feedback
Name three key internal conditions that need to be controlled through homeostasis.
Temperature; Water levels; Blood glucose level
Name the cell type that detects stimuli in the internal or external environment.
Receptor
Name the component in the nervous system that processes the stimuli information.
Coordination centre
Name the component in the nervous system that bring about responses to stimuli.
Effectors
State the function of a neurone.
Transmit electrical impulses
Name the type of neurone that carries impulses to the central nervous system.
Sensory neurone
Name the type of neurone that carries impulses away from the central nervous system.
Motor neurone
Name two types of effectors.
Muscle; Glands
Name the two coordination centres that make up the central nervous system.
Brain + Spinal cord
Where is the cell body found in the sensory neurone?
Along/On the neurone fibre
Where is the cell body found in the motor neurone?
At the beginning of the motor neurone
Name one factor that may affect human reaction time.
Energy or sugary drinks/Practise beforehand/drugs etc.
What are reflex actions?
Automatic and rapid actions that do not involve the conscious parts of the brain to protect us
Name the three types of neurones that are involved in coordinating reflexes.
Sensory, relay, motor neurones
