Thyroid gland
Follicular cells - Epithelial cells surrounding the what that synthesize and secrete what?
Colloid - does what for for thyroid hormone precursors?

Parafollicular cells (C cells) secrete what?
Involved in calcium metabolism

Follicular cells: Epithelial cells surrounding colloid that synthesize and secrete thyroid hormones

Colloid Storage depot for thyroid hormone
precursors

Parafollicular cells (C cells) secrete calcitonin
Involved in calcium metabolism