triiodothyronine and thyroxine

Thyroxine=

T4

triidothyronine=

T3

how is the amount released determined?

amount in blood determines amount released

how does tsh travel in blood?

bound to protein until reaches target cell

how do t3 and t4 affect the target cell?

by increasing the metabolic rate

when are t3 and 4 secreted?

constantly secreted in blood bcs has to break doen chemicals all the time

t3 and t4 target what?

every type of cell except spleen and testes

two diseases w t3 and t4:

goiter graves disease

graves disease

over active thyroid =hyperthyroidism symptoms= weight loss, insomnia, and hand tremors

goiter

swelling of the thyroid gland caused by iodine deficiency

differences between t3 and t4?

t3: 4x more potent in thyroid gland: 80% production is t4

how long does t3 last and how long does t4?

t3= 2.5 days t4= 6.5 days

what is the thyroid stimulating gland and what sends it out?

the pituitary gland sends it out. TSH:

t3 and t4 are released by what?

the thyroid gland

what stimulates t3 and t4 to b sent out?

tsh

hyposecretion leads to:

weight gain bcs decreased metabolic rate

hypersecretion leads to:

weight loss bcs incrwased metabolic rate