B10 The Nervous System Flashcards
10.1 What is Homeostasis
It is the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal and external changes.
10.1 Why is Homeostasis important
It is important for maintaining optimal conditions for enzyme action and all cell functions.
10.1 What does Homeostasis usually include?
It includes control of blood glucose concentration, body temperature and water levels.
10.1 What type of responses do automatic control systems involve?
Nervous or chemical responses.
10.1 What do control systems include?
Receptors, coordination centres and effectors.
10.2 What does the nervous system do?
It uses electrical impulses to your surroundings and coordinate your behaviour.
10.2 What do receptors do?
They are cells which detect stimuli (changes to the environment).
10.2 What happens after you receive a stimulus in a Nervous system?
Impulses from recptors pass along sensory neurones to the brain or spinal cord (CNS). The brain coordinates the response, and impulses are sent along motor neurones from the brain (CNS) to the effector organs.
10.2 How does the nervous system work (summed up)?
Stimulus —> Receptor —> Coordinator (CNS) —> Effector
10.3 What are reflex actions
They are actions that are automative and rapid and do not involve conscious parts of the brain.
10.3 What do reflexes involve?
They involve sensory, relat and motor neurones.
10.3 What do reflex actions control?
They control everyday bodily functions, such as breathing and digestion, and help you avoid danger.
10.3 What are the main stages of reflex actions?
Stimulus —> Receptor —> Sensory Neurone —> Relay Neurone —> Motor Neurone —> Effector —> Response
10.4 What is the brain?
It has interconnected neurones that control complex behaviour.
10.4 What is the cerebral cortex?
It is concerned with consciousness, intelligence, memory and language.
