Mouth, Esophagus and Stomach (lesson 4)

Question 1

What is the function of saliva?

Answer 1

1) Lubrication
2) Protection
3) Chemical digestion

Question 2

What are the four types of teeth and how much for each

Total?

Answer 2

• 8 incisors
• 4 canines
• 8 premolars
• 12-8 molars

Total: 28 but with wisdom teeth 31

Question 3

What is the tongue made out of and covered with?

Answer 3

Made of out muscle and covered with mucus glands and tastebuds

Question 4

What are the functions of the tongue?

Answer 4

1) Helps with speech
2) Helps with chewing by moving food
3) Creates bolus (ball of chewed food and saliva
4) By swallowing, pushes food to hard palate towards throat

Question 5

What is the esophagus?

Answer 5

Thin tube with muscle and lined with mucus to help peristaltic movement (muscle contractions)

Question 6

Describe the stomach

Answer 6

J shape pouch that have inner walls that are highly folded into many ridges called reggae

Question 7

What is the cardiac sphincter (aka lower esophageal sphincter)

Answer 7

Ring of muscle tissue lining the entrance of stomach and preventing back-flow up to esophagus

Question 8

What are the two digestions of the stomach?

Answer 8

1) Mechanical digestion: Muscles lining walls of stomach contract, physical breaking down food into smaller pieces

2) Chemical digestion:

-Gastric juices (contains rennin) helps chemical breaking down of food

-Hormone gaskin released when bolus past the cardiac sphincter

-Gastin goes to bloodstream and cause glands in stomach release gastric juices

• Gastic juices do chemical digestion and contain pepsin

Question 9

What is pepsin?

Answer 9

Pepsin breaks up proteins into short peptides