MECHANISM OF SWALLOWING

Question 1

Complex reflex mechanism by which food is pushed from oral cavity to the stomach

Answer 1

Swallowing

Question 2

3 phases of swallowing

Answer 2

Oral, pharyngeal and oesophageal

Question 3

Breakdown of food’s complex molecules into chemical molecules

Answer 3

Digestion

Question 4

Uptake of digested products from the GI tract into blood

Answer 4

Absorption

Question 5

Excretion of indigestible products from blood

Answer 5

Excretion

Question 6

Food is chewed and segmented including mastication

Answer 6

Mechanical breakdown

Question 7

How many muscles are involved in swallowing

Answer 7

20 muscles

Question 8

Voluntary phase

Answer 8

Oral phase

Question 9

Involuntary phase

Answer 9

Pharyngeal phase and Oesophageal phase

Question 10

How is food prevented from going back to the oral cavity after swallowing?

Answer 10

The tongue blocks the oral cavity

Question 11

How is food prevented from going into the nasopharynx

Answer 11

The soft palate and uvula elevates and blocks the nasipharynx

Question 12

How is food prevented from getting into the air passage(Larynx)

Answer 12

The epiglottis closes off the larynx

Question 13

Nerves involved in oral phase

Answer 13

Glossopharyngeal nerve

Question 14

Nerves involved in pharyngeal phase

Answer 14

Trigeminal nerve5, facial7, glossopharyngeal9, vagus10, accessory11 and hypoglossal12

Question 15

Movement of bolus through oesophagus

Answer 15

Peristalsis