Thyroid Basics
Where is the thyroid located?
Front of the neck
What are the two main thyroid hormones?
T3 and T4
What hormone does the hypothalamus release?
TRH
Hypothyroidism means the thyroid hormone is too high or too low?
Too low
Hyperthyroidism means thyroid hormone is too high or too low?
Too high
What shape is the thyroid gland?
Butterfly-shaped
Which thyroid hormone is more active?
T3
What hormone does the anterior pituitary release?
TSH
Does hypothyroidism speed up or slow down the body?
Slow down
Does hyperthyroidism speed up or slow down the body?
Speed up
The thyroid is part of which body system?
Endocrine system
Which hormone helps lower blood calcium?
Calcitonin
TSH stimulates what gland?
Thyroid gland
Name one symptom of hypothyroidism
Tiredness, weight gain, feeling cold, or slow heart rate
Name one symptom of hyperthyroidism
Weight loss, feeling hot, anxiety, sweating, or fast heart rate
What is the main job of the thyroid?
Control metabolism
What does TSH stand for?
Thyroid-stimulating hormone
When T3/T4 levels are high, what happens to TRH and TSH?
They decrease
In primary hypothyroidism, TSH is usually high or low?
High
In primary hyperthyroidism, TSH is usually high or low?
Low
What mineral does the thyroid need to make thyroid hormones?
Iodine
What gland releases TSH?
Anterior pituitary gland
What is this control system called?
Negative feedback
Why is TSH high in primary hypothyroidism?
The pituitary keeps trying to stimulate the thyroid.
Why is TSH low in primary hyperthyroidism?
High T3/T4 shut off TSH by negative feedback.