homeostasis +nervous system

• define homeostasis

  the regulation of the internal conditions of a cell/organism to maintain optimum conditions for function, in response to internal and external changes
• what are the factors controlled by homeostasis?

  temperature, ph levels, blood glucose concentration, water levels of blood, ion concentrations of blood, concentration of waste materials
• what are the 2 waste products

  co2, urea
• what are the 2 types of automatic systems?

  nervous system

  hormone system
• define receptor

  a type of cell that detects changess in the environment
• define sensory neurone

  sends electrical impulses from the receptors in the sense to the brain(cns)
• define coordinator

  the brain and spinal column

  also known as central nervous system(CNS)

  processes the information from the sensory neurones
• define motor neurone

  sends electrical impulses from the brain to the musles and glands
• define effector

  usually a muscle or gland

  responds when it receives a message from the brain
• what is a neurone?

  the nerve cells responsible for carrying electrical impulses around the body
• what is a nerve impulse?

  when a receptor is stimulated, an electrical impulse is generated to record this change and generate a response
• all control systems include

  receptors, coordination centre, and effectors
• define stimulus

  a change in the environment that sets of a reaction, and is detected by receptors
• define response

  the reaction to a stimulus
• define synapse

  the gap between two neurones
• define reflex action

  rapid automatic responses to the nervous system that do not involve conscious thought
• what is generated when a receptor is stimulated?

  an electrical impulse
• what is a neurone?

  the nerve cells responsible for carrying electrical impulses around the body
• where are adrenal glands located?

  at top of kidneys
• Explain how diabetes can cause the cells to lose more water.

  diabetes leads to high glucose concentrations in the blood

  the blood is more concentrated or less dilute than the solution in the cells

  water moves out of cells by osmosis 

  water moves through a partially permeable membrane
• define relay neurone

  the neurones in the CNS that allow other neurones to communicate with each other