b5 - homeostasis and response Flashcards
(43 cards)
what is homeostasis
the regulation of internal conditions of a cell or organism to maintain optimum conditions for the body to function
what is regulated
blood glucose levels
body temperature
water levels
waste
what does the nervous system use to communicate
electrical impulses
what does the endocrine system use to communicate
chemical molecules
what does each control system have
receptor
coordination centre
effector
what does the receptor do
detect the change
what does the coordination centre do
receive and process information
what does the effector do
bring about a response
nervous system response speed
rapid and precise
endocrine system response speed
slower but longer
nervous system type of message
nerve impulse - electrical
endocrine system type of message
hormone - chemical
nervous system action
carried in nerves to location
endocrine system action
carried in blood to organs
what is the control nervous system
consists of the brain and spinal cord. it is responsible for processing information and giving instructions.
what is the peripheral nervous system
consists of neurons, receptor, cells and effectors. it is responsible for collecting information, sending it to the CNS and acting on instructions from the CNS
types of neurons
sensory
motor
relay
what do sensory neurons do
carry information as electrical impulses from the receptors to the CNS
what do motor neurons do
carry electrical impulses from the CNS to effectors
order leading to a response
stimulus
receptor
sensory neurone
CNS
motor neurone
effector
response
what is the connection between to neurones called
synapse
what is a reflex
rapid, automatic responses to a stimulus that doesn’t involve the conscious part of the brain. they prevent injury
what is a reflex arc
the passage of information in a reflex from receptor to effector
what do relay neurones do
connect sensory neurones to motor neurones
