homeostasis Flashcards
what is homeostasis
the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes
essentially what is homeostasis
keep internal conditions as constant as possible
what does any sort of exercise do to the human body
causes demands on the body
in the human body how is homeostasis used
to keep the blood glucose concentration, the body temperature and water levels constant
homeostasis consists of what
automatic control systems making sure that the internal conditions of the body stay as constant as possible
the automatic control systems in the human body can involve what
nervous system and hormones
what are the 3 components of the automatic control system
receptor cells
co-ordination centre
effector
receptor cells detect what
changes in the environment
the word environment in this context could mean what
the body’s internal conditions
(eg concentration of glucose in the blood)
the word environment as well as internal conditions could also mean what
the body’s external conditions
(eg the temperature for the skin)
scientists call the change to an environment a what
a stimulus
the receptor cells then pass the information to what
a co-ordination centre
(eg the brain, spinal cord or pancreas
the co-ordination centre does what
receives and processes the information from the receptor cells
the co-ordination centre then sends instructions where
to the effector
an effector is what
a muscle or a gland
