Chapter 2 Flashcards
Define homeostasis
The regulation of the internal conditions of a cell or organism to maintain conditions
Why does homeostasis need to maintain optimal conditions
For enzyme action and all cell functions
List 3 conditions that the boy needs to maintain
Blood glucose concentration, body temperature and water levels
What does the two automatic response systems involve
Nervous systems or chemical responses
Define stimuli
Changes in the environment
List the receptor cells and state what stimulus the detect
Eye (retina)-light Ear-sound Nose-chemicals in the air Mouth (tongue) - chemicals in food Skin-touch, pressure, pain, and temperature
Name the 3 coordination centres in the body and describe what each of them coordinates
The brain coordinates information about receptor cells and sends signals to the muscle and glands
Spinal chord- coordinates messages from the brain and receptor cells coordinates reflexes
Pancreas-coordinates the glucose levels in the blood
What’s an effector
A muscle or a gland
What’s a stimulus
Any change in the surroundings
What’s a receptor
Cells that detect change
Name two parts of the central nervous system
Brain spinal chord
What’s an effector
A muscle or a gland
What’s CNS and what does it coordinate
central nervous system
It coordinates the response from of effectors
What’s the role of the sensory neurone
Carry’s impulses from the receptors to the CNS
What’s the role of the relay neurone
Connects the sensory neurone to the motor neurones in the CNS
