4.2.3.1 Major Hormones (Thyroid Gland) Flashcards
A butterfly-shaped organ consisting of two lobes (right and left) that rest on
each side of the trachea, bridged by a band of tissue called________
a. Isthmus
b. Thyroid
c. Colloid
d. Thyroglobulin
a
In thyroid gland, each lobe consist of?
Follicles
Follicles are spheres of thyroid cells surrounding a core of viscous substance termed?
a. Isthmus
b. Thyroid
c. Colloid
d. Thyroglobulin
c
The colloid, that central core of viscous substance consists mainly of
a. Isthmus
b. Thyroid
c. Colloid
d. Thyroglobulin
d
A glycoprotein manufactured exclusively by the thyroid follicular cells which are used for thyroid hormone synthesis
Thyroglobulin
Two types of cell in Thyroid:
also known as C-cells. Produces
Calcitonin.
a. Follicular cells
b. Parafollicular cells
b
Two types of cell in Thyroid:
encircled in the colloid. Produces T4 & T3
a. Follicular cells
b. Parafollicular cells
a
100% of T4 originated from follicular cells while 20% is T3 since ito comes from monodeiodination of T4
T or F
T
Thyroid hormones are primarily boound to transport protein
T or F
T
70% of T4 are bound to
a. Thyroxine binding globulin (TBG)
b. Thyroxine binding prealbumin (TBPA) / Transthyretin
a
20% of T4 are bound to?
a. Thyroxine binding globulin (TBG)
b. Thyroxine binding prealbumin (TBPA) / Transthyretin
b
10% of T4 are bound to?
Albumin
All thyroid are 100% bound
T or F
F
small percentage are not bound
0.04% of ____ and 0.4% ____ are unbound
T4
T3
Function is none
a. Thyroxine (T4)
b. 3,5,3’-triiodothyronine (T3)
c. Reverse T3 (3,3’,5’-triiodothyronine)
d. Calcitonin
c
