homeostasis Flashcards
(23 cards)
what is homeostasis?
balance used to describe reactions in living things that need to occur in order to maintain balance
what type of things does your body that need balance?
cold > temp < Hot
glycogenesis
making something > excess glucose that cant be used is stored
glycogenolysis
breaks down glycogen when there is not enough glucose for cells
eg: exercise
stimulus-response model
A model that describes how a system responds to a stimulus
negative feedback loop
a stimulus-response process in which the response counters the stimulus
stimulus
an event that can initiate a response
receptor
a structure that detects a signal or external change, usually a protein
modulator
location where information form receptors is sent to and compared to a sent to and compared to a set point, and where molecules altering the functioning of an effector are released also known as the processing centre
effector
A molecule, cell, organ that responds to a signal and produces a response
hormone
in order to maintain homeostasis your brain must send or receive signals using chemicals called hormones
what is one of the bodys response to regulate body temp?
sweat glands throughout body
=evaporative cooling
hormones can?
travel through the blood stream
response
the action of a cell, organ, or organism caused by a stimulus
thermoregulation
the homeostatic process of maintaining a consistent internal body temperature
hypothalamus
a section of the brain that controls the maintenance of the body’s internal environment
what happens if your body temp too hot
on a hot day, the hypothalamus sends signals to different effectors which is aimed to increase the amount of heat produced by the body
what are effectors of your body temp going up
mulitple answers
> sweat glands produce sweat which evaporates from the skin
small blood vessels vasodilate- increase surface blood flow
the cerebral cortex causes changes in behaviour - such as seeking shade
arrestor pili muscles
cells
what are the responses of your body temp increasing ?
muliple answers
> sweating
dilation of arterioles
change in behaviour
chnage in behaviour
flattening of hair
decrease in metablic rate
what happens if your body temp too cold
thermpreceptors signals the chnage which signals the hypothalamus which trigger the effectors when the change is detected in temp it triggers number of responses increasing the amount of heat produces by the body
what are effectors of your body temp going down
> skeletal muscles- stimulated to move qucikly which increases their metablisim and creates more heat energy
small blood vessels- vasocontriction
the cerebral cortex- behaviour
arrector pili muscles
cells
brown fat
what are the responses of your body temp decreasing ?
> shivering
conwtriction of arterioles
change in behaviour
lifting of hair
increasing in metabolic rate
burning of triglycerides
