Regulating Metabolism Flashcards
T________ increases metabolism, TSH stimulates its secretion. What stimulates the secretion of TSH and what reduces it?
Thyroxine
TSH
TSH releasing factor
TSH inhibiting factor
What are the stimuli of high metabolism?
High metabolism = high temperature
High levels of thyroxine
What receptors detect high metabolism?
Thermoreceptors - skin
Hypothalamus - blood
Chemoreceptors - aortic and carotid bodies
What modulates high metabolism and how?
Hypothalamus - TSH inhibiting factor
Pituitary anterior - decreases TSH secretions
Effectors of high metabolism?
Thyroid gland
Response to less TSH?
Reduced production of thyroxine
Feedback from decreased levels of thyroxine?
Negative
Lower thyroxine levels
Decreased metabolism = decreased temp.
Whats the stimuli of low metabolism?
Low metabolism = low temp.
Low thyroxine levels
What receptors detect low metabolism?
Thermoreceptors - skin
Hypothalamus - blood
Chemoreceptors - aortic and carotid bodies
What modulates low metabolism and how?
Hypothalamus - TSH releasing factor
Pituitary anterior - secretes more TSH
Effector of thyroxine?
Thyroid glands
Response to increased TSH?
Higher thyroxine levels
Increased metabolism = increased temp.
Feedback from increased levels of thyroxine?
Negative
High thyroxine levels
Higher metabolism = high temp.
What is hyperthyroidism? How is it caused? What is another name for this?
Overproduction of thyroxine
Immune response causes enlargement/overstimulation of thyroid
Grave’s Disease
How does a doctor know someone has HYPERthyroidism?
They have high levels of TSH inhibiting factor in the blood and yet still have a high metabolism
Stimulus for HYPERthyroidism?
High levels of thyroxine
Receptors for HYPERthyroidism?
Chemoreceptors in hypothalamus
What modulates HYPERthyroidism and how?
Hypothalamus - TSH inhibiting factor
Pituitary anterior - secretes less TSH
Effector of HYPERthyroidism, and issue?
Thyroid - enlarged gland
Response of effector, with HYPERthyroidism?
Continual production of thyroxine
Feedback of HYPERthyroidism?
Positive
Thyroxine levels still high
How does a doctor know someone HYPOthyroidsim?
High levels of TSH in the blood and yet still a low metabolism
What is HYPOthyroidism? How is it caused? What is another name for it?
Underproduction of thyroxine
Due to lack of iodine in the diet (iodine helps to produce thyroxine)
Hashimoto’s disease
Which receptors detect HYPOthyroidism?
Chemoreceptors in the hypothalamus
What modulates HYPOthyroidism and how?
Hypothalamus - TSH releasing factor
Pituitary anterior - secretes more TSH
Effector of HYPOthyroidism, and the issue?
Thyroid - low iodine
Response from effector, with HYPOthyroidism?
Thyroxine cant be produced
Feedback of HYPOthyroidism?
Positive
Thyroxine levels still low
Stimulus of HYPOthyroidism?
Low levels of thyroxine
