Thyroid gland

Question 1

Location

Answer 1

•in the anterior and inferior neck superficial to the larynx

Question 2

Thyroid follicles

Answer 2

•the thyroid is composed of these hollow spheres

Question 3

Follicle Cells

Answer 3

• cells that line the thyroid follicles are these simple cuboidal cells
• they respond to TSH from the anterior pituitary by secreting a chemical into the colloid

Question 4

Thyroxine (T4)

Answer 4

• four iodine molecules

* produced from follicle cells reacting to TSH

Question 5

Triiodothyronine (T3)

Answer 5

• has three iodine molecules
• most active form
• acts on almost all cells
• increases metabolic rate
• increase protein synthesis
• regulate the heart rate and blood pressure

Question 6

C cells

Answer 6

• paradollical cells

* produce calcitonin

Question 7

Calcitonin

Answer 7

• regulate calcium homeostasis
• secreted calcium levels in the blood rise
• decreases blood calcium by triggering osteoblasts activity