21. Homeostasis Flashcards
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What is homeostasis?
The condition of a relatively stable internal environment, maintained within narrow limits, in the face of external change.
What is the condition of a relatively stable internal environment, maintained within narrow limits, in the face of external change.
Homeostasis
What is the prefix for “above normal”
Hyper
What is the prefix for “below normal”
Hypo
What does NAD mean?
No abnormalities detected
What is the abbreviation for no abnormalities detected
NAD
What is the abbreviation for within normal limits?
WNL
What does WNL mean?
Within normal limits
What is a key term when discussing how systems maintain homeostasis?
Regulate
What does the term regulate mean?
To make changes to ensure things are within normal limits
What is meant by negative feedback loop?
The response to stimulus is in the OPPOSITE direction
eg. is something is increasing, the reaction will be to decrease
Would you shiver or sweat in response to hyperthermia and why?
sweat - to decrease body temp
sweat = heat loss via evaporation
Would you shiver or sweat in response to hyporthermia and why?
shiver - to increase body temp
Shiver = heat generation via movement
Would you experience vasodilation or vasoconstriction to the organs in response to hyperthermia and why?
Vasoconstriction - as blood needs to be redirected to the skin to cool down
heat loss to skin via radiation
Would you experience vasodilation or vasoconstriction to the skin in response to hypothermia and why?
Vasoconstriction - as blood needs to be redirected to the organs to maintain heat
heat loss to skin via radiation
Would you experience vasodilation or vasoconstriction to the skin in response to hyperthermia and why?
Vasodilation - as blood needs to be redirected to the skin to cool down
heat loss to skin via radiation
Would you experience vasodilation or vasoconstriction to the organs in response to hyporthermia and why?
Vasodilation - as blood needs to be redirected to the organs to maintain heat
heat loss to skin via radiation
Do you exeprience pilo erection during hyperthermia or hypothermia?
Hypothermia - hairs on skin erect to trap heat
heat loss via radiation
Is insulin or glucagon released in response to hyperglycaemia and why?
Insulin - increases blood glucose uptake as glycogen into cells
decreases BGL
Is insulin or glucagon released in response to hypoglycaemia and why?
Glucagon - as it breaks down stored glycogen into blood glucose
increases BGL
Does ADH release increase or decrease in response to low blood volume and why?
increase - to increase water absorption into the blood increasing blood volume
Does ANP release increase or decrease in response to high blood volume and why?
increase - to decrease salt and water absorption into the blood decreasing blood volume
Does aldosterone release increase or decrease in response to low blood volume and why?
increase - to increase salt and water absorption into the blood increasing blood volume
Does high blood volume lead to high or lower blood pressure?
High
