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Flashcards in Gas Exchange/ Digestion Deck (11):
0

What is peristalsis?

When food is pushed along the oesophagus by the action of muscles

1

What are villi?

Small structures that increase the surface area to allow food to be absorbed more quickly

2

How does air enter the body?

Through the trachea

3

The trachea branches into smaller tubes called ------

Bronchi

4

The bronchi then branches into smaller tubes called

Bronchioles

5

At the end of the bronchioles there is an ... ....

Air sac

6

The air sac has bumps on them what are these bumps called?

The alveoli

7

What are cilia?

They are small hair like structures stop mucus blocking air ways by pushing it down

8

What happens when you inhale?

Air rushes in
Intercostal muscles contract
Volume of chest cavity increases
Diaphragm contracts
Pressure decreases

9

What happens when you exhale?

Air rushes out
Intercostal muscles and diaphragm relax
Volume of chest cavity decreases
Pressure increases

10

What's the test for carbon dioxide?

If present turns limewater cloudy