Secretions

Question 1

Inorganic composition of saliva

Answer 1

Na
Ca
PO4
HCO3

Question 2

What does phosphate do in saliva

Answer 2

Prevents tooth decay

Question 3

Organic make up of saliva

Answer 3

Mucin
IgA

Lysozymes

Amylase

Question 4

What is mucin structurally

Answer 4

Proteoglycan

Protein core with CHO attached

Either N or O linked depending on how bound to the AA

Question 5

What is the highest component of protein in saliva

Answer 5

Mucin

Question 6

What is the 2 functions of mucin

Answer 6

Lubricates

Hydration

Question 7

Why does mucin have the functions it does?

Answer 7

Highly glycosylated meaning retains water

Weak H bondings

Question 8

What is the function of gastric juices

Answer 8

Kill pathogens (acidic pH)

Protect against auto-hydrolysis

Digestion

• pepsin
• HCL

Question 9

What are two types of cell secretions in gastric

Answer 9

Parietal
(Stimulated by food)

Non parietal
(Always secreting)

Question 10

What is the composition of gastric juices

2 cell types

Answer 10

Parietal

• H+
• Cl +
• Na

Non parietal

• Na
• ca
• K
• Cl

Question 11

Function of pancreatic juice (2)

Answer 11

Digestion of 3 main food groups

Buffer - against chyme

Question 12

Composition of pancreatic juices

Answer 12

Organic
Proteases
Lipid
Amylase

Non organic 
Na 
K
Cl
Ca 

HCO3 and HPO4 = buffer

Question 13

Functions of bile (2)

Answer 13

Emulsifying fats

Excretion of waste

Question 14

Composition of bile

Answer 14

Na
K
Cl

Bile salts

Bile pigments = bilirubin and heme excreted

Question 15

Function of intestinal juices (2)

Answer 15

Protect epithelium

Digestion of proteins

Question 16

Composition of intestinal juices

Answer 16

Na 
K
Cl
Ca 
Hco3 
Hpo4

Mucin

Proteases

Question 17

How many secretions are there

Answer 17

5

Question 18

Saliva function

Answer 18

Protection

• lubricate
• protect
• buffer
• hydration

Digestion
- amylase