Homeostatic Systems Flashcards

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1
Q

Calcium levels

A

Low - Parathyroid gland secretes PTH - osteoclasts break down bown, renal reabsorption, Vit D synthesis causes increased intestinal absorption
High - Calcitonin from thyroid - osteoclast activity halted, kidney reabsorption stops

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2
Q

T3 & T4 levels

A

Low T3 & T4 or low body temperature - hypothalamus releases TRH - pituitary releases TSH - Thyroid gland releases T3 & T4

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3
Q

Blood sugar levels

A

High - insulin from pancreas - cellular uptake of glucose - liber converts glucose to glycogen
Low - glucagon from pancreas - break down glycogen to form glucose

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4
Q

Body Temperature

A

High - hypothalamus heat-loss centre activated - capillaries near skin dilate & sweat glands release sweat
Low- activates heat-promoting centre of hypothalamus - skin blood vessels contract - blood travels through deeper tissue - skeletal muscles shiver

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