Topic 12 - Secretory epithelia : Modes of secretion

Question 1

Merocrine

Answer 1

pancreas
secretory cell intact. products is small granules. Exocytosis, due to fusinf with the plasma lemma. Most glands. most common

Question 2

Apocrine

Answer 2

sweat and mammary
plasma lemma surrounds a large secretory granule and pinches off from cell apex. enters lumen as a secretory drop, and leaves rest of plasma lemma intact

Question 3

Holocrine

Answer 3

sabecous
secretory cell fills with lipid granules. cell moves to gland duct. organelles degenerate. cell dies. membrane braks down and secretum empties into duct.