Physiology - Secretions

Question 1

1. What are the three types of glands?

Answer 1

Single cell mucous glands, secretory cells and tubular glands

Question 2

2. What is the composition and function of mucus?

Answer 2

composed by water, ions and glycoproteins
has adhesive properties
protects gut walls from bacteria, big hard food pieces and buffering

Question 3

3. What is the composition, production and regulation of saliva?

Answer 3

Composed by mucus, water and ptyalin

Production is in two steps, first acini cells secrete ecf,, mucus and ptyalin (initiates the digestion of carbs), secondly theres the absorption of na+/cl- and secretion of k+/hco3-

Is regulated by long reflexes through the autonomic nervous system, by local stimuli of chemo- and mechanoreceptors and by visual/olfactory stimuli

Question 4

4. What is the secretion present in the esophagus and what is the function?

Answer 4

Mucus

continues carbs digestion and avoid demage due stomach acid influx

Question 5

5. What types of cells are present in the gastric glands?

Answer 5

mucous neck cells, parietal cells, chief cells, g cells, enterochromaffin-like cells and delta cells

Question 6

6. Mucous neck cells

Answer 6

found in the neck of the gland
releases mucus and bicarbonate
help create the gastric barrier
higher production upon mucosa irritation