A thyroid gland cell secretes thyroid hormones into the blood. This is an example of ____.
A)diffusion
B)endocytosis
C)exocytosis
D)osmosis
E)facilitated diffusion

Question

A thyroid gland cell secretes thyroid hormones into the blood. This is an example of ____. ​
A)diffusion
B)endocytosis ​
C)exocytosis
D)osmosis
E)facilitated diffusion

Quizplus · Accepted Answer

The secretion of thyroid hormones from thyroid gland cells into the blood requires exocytosis, as the hormones are packaged into vesicles and released from the cell through fusion of these vesicles with the plasma membrane. Diffusion, endocytosis, osmosis, and facilitated diffusion do not involve the secretion of molecules into the extracellular space or blood.

A Thyroid Gland Cell Secretes Thyroid Hormones into the Blood