B2 Healthy Heart & Lungs Flashcards Preview

Phase I Medicine > B2 Healthy Heart & Lungs > Flashcards

Flashcards in B2 Healthy Heart & Lungs Deck (18):
1

What are the two types of the epithelia in the nose, trachea and bronchus?

Respiratory and Olfactory

2

What are the three types of respiratory epithelia?

Ciliated
Goblet
Basal

3

What is the olfactory epithelia?

Specialised olfactory cells with a type of neuron that has tentacle like projections to increase SA

4

True or false? Olfactory cells are replaced regularly?

True - they are regenerated by basal cells

5

True or false? The nose only has olfactory epithelia?

False- It also has respiratory epithelia

6

What type of epithelium is in the trachea and bronchi?

Ciliated
Goblet
Basal
Columnar

7

What does the majority of the alveolar surface comprise of?

Type I Pneumocytes (Squamous)

8

What does the air-blood interface comprise of?

Flattened cytoplasm of type I pneumocyte
Fused basal lamina
Flattened cytoplasm of capillary epithelial cell

9

Why is gas exchange efficient through the air blood interface?

Large SA:Vol

10

What is the second type of epithelial cell?

Type 2 Pneumocytes

11

What do type 2 pneumocytes do?

Secrete surfactant

12

What is the role of surfactant?

Makes SA for diffusion as large as possible

13

How does surfactant increase surface area?

Decreasing surface tension

14

What are the other components of alveoli?

Interstitial spaces with elastic fibres
Lymphoid cells

15

What is the histology of bronchioles?

More cuboidal epithelia with Clara cells replacing goblet cells

16

What are the particle expulsion mechanisms of the respiratory tract?

Coughing, Sneezing, Cilia

17

What are the immune defense mechanisms of the respiratory tract?

Alveolar macrophages
Lymphoid tissues and IgA
Inflammatory response

18

What are the lung defense secretions?

Mucus (beaten by cilia)
Lysozyme