Endocrine System Feedback Cycles

GHFS 1

stimulus from low blood nutrient levels

GHFS 2

receptor: hypothalamus detect the need for GH

GHFS 3

hypothalamus releases GHRH into the hypothalamo-hypophyseal portal system

GHFS 4

in response to the GHRH anterior pituitary releases GH

GHFS 5

GH stimulates hepatocytes to release IGFs into the blood

GHFS 6

Blood nutrient levels have risen as fatty acids and glucose rises

the final stage of any feed back cycle

stop

THFS 1

hypothalamus is stimulated by decreased TH

THFS 2

the hypothalamus detect the low levels of TH hormone

THFS 3

the hypothalamus releases TRH into hypothalamo-hypophyseal portal system

THFS 4

responding to TRH anterior pituitary release TH

THFS 5

TH acts on the target cells or effectors

THFS 6

increased metabolic rate supported by excess fuel in molecules and increased by delivery of oxygen

CFS 1

low cortisol levels

CFS 2

hypothalamus detects the low level of cortisol

CFS 3

Hypothalamus releases CRH into the hypothalamo-hypophyseal portal system

CFS 4

in response to CRH the anterior pituitary releases ACTH

CFS 5

ACTH stimulates the adrenal cortex to release glucocorticoids like cortisol into the blood

CFS 6

increase in all nutrients of the blood

IFS 1

increase in blood glucose

IFS 2

beta cells in the pancreas detect an increase in blood glucose levels

IFS 3

beta cells in the pancreas release insulin

IFS 4

insulin stimulates the target cells (effectors) such as liver tissue

IFS 5

decrease blood glucose and decrease amino acids and fatty acids

GFS 1

decrease in blood glucose

GFS 2

alpha cells in pancreas detect decreased blood glucose

GFS 3

alpha cells in pancreas release glucagon

GFS 4

glucagon stimulates effectors such as the liver

GFS 5

increased blood glucose and fatty acids without a change in proteins or amino acids