Lecture 31 11/8/23 Flashcards
(35 cards)
What is a gland?
a cell/group of cells that secrete a chemical substance
What are the two possible fates for gland secretions?
-use within the body
-discharged into the surroundings
Where do endocrine glands secrete their products?
directly into the bloodstream
What are examples of endocrine glands?
-endocrine pancreas
-thyroid
-pituitary
Where do exocrine glands secrete their products?
into ducts
What are examples of exocrine glands?
-exocrine pancreas
-sweat glands
-sebaceous glands
What are unicellular glands?
glands comprised of only a single cell
What are examples of unicellular glands?
-goblet cells (exocrine)
-enterochromaffin cells (endocrine)
What are multicellular glands?
secretory unit comprised of many cells
What is an example of a multicellular gland?
pancreas
What are the potential gland shapes?
-tubular
-acinar
What does the shape classification of the gland depend on?
the shape of the secretory component
What are the two types of tubular glands?
-straight
-coiled
What is merocrine secretion?
membrane of the secretory droplet fuses with plasma membrane
Which glands undergo merocrine secretion?
-salivary
-pancreas
-eccrine sweat glands
What is apocrine secretion?
piece of apical/top cytoplasm pinches off
Which glands undergo apocrine secretion?
-mammary glands
-apocrine sweat glands
-ceruminous glands
What is holocrine secretion?
entire cell becomes secretory product
Which glands undergo holocrine secretion?
sebaceous glands
Which type of secretion can be visualized microscopically?
holocrine
What are the characteristics of serous secretion?
-high protein
-watery
-appear as eosinophilic apical cytoplasmic granules
Which glands produce serous secretions?
-exocrine pancreas
-salivary glands
-gastric glands
What are the characteristics of mucus secretion?
-viscous
-high glycoprotein
-foamy cytoplasm with flattened basal nuclei
Which glands produce mucus secretions?
-salivary glands (some)
-gastric glands
