THE DIGESTIVE SYSTEM:STOMACH

Question 1

Name 2 types of digestion that occurs in the stomach

Answer 1

Mechanical and chemical digestion in the stomach

Question 2

Describe mechanical digestion in the stomach

Answer 2

The food is mechanically digested through churning actions in the stomach

Question 3

What are gastric juices?

Answer 3

Hydrochloric acid ,mucus, enzyme solution

Question 4

What is the role of hydrochloric acid in the stomach?

Answer 4

HCI is present to kill bacteria in food and provide an optimum PH for the protease enzyme to work

Question 5

What is the optimum PH for the protease enzyme in the stomach?

Answer 5

PH 2

Question 6

What enzyme works in the stomach?What does it do?

Answer 6

Protease enzymes(pepsin) start to chemically digest proteins into amino acids in the stomach

Question 7

Name the different types of tissue found in the stomach

Answer 7

Muscular tissue,
 Glandular tissue,
 Epithelial tissue,

Question 8

What does the muscular tissue in the stomach do?

Answer 8

Muscular tissue, to churn the contents of the stomach=
mix the boluses of food with gastric juice.

This mixing leads to the production of the thick liquid known as chyme

Question 9

What does the Epithelial tissue,in the stomach do?

Answer 9

 Epithelial tissue, to cover the outside and inside of the stomach.

Question 10

What does the Glandular tissue in the stomach do?

Answer 10

Glandular tissue:

Produces HCI, mucus, releases pro tease enzymes

Question 11

What does the stomach also create?

Answer 11

Mucus,to protect the stomach from the hydrochloric acid (otherwise the HCI would digest the tissue that made it)

Question 12

DESCRIBE THE PROCESS OF PERISTALSIS IN THE STOMACH

Answer 12

When the circular muscles contract,
and the longitudinal muscles relax
=the gut becomes narrower

When the opposite happens

The longitudinal muscles contract
and the circular muscles relax
=
the gut becomes wider

Waves of muscles contractions like this pass along the gut pushing the food along

Question 13

Where is the sphincter muscle?

Answer 13

A RING OF MUSCLE AT THE at the ENTRY and EXIT points of the stomach OF THE STOMACH

Question 14

What does the sphincter muscle do?

Answer 14

It holds back semi-digested food , and releases it when relaxed into the duodenum

Question 15

What is chyme?

Answer 15

Chyme, a thick semifluid mass of partially digested food and digestive secretions