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Apex 1 - 2 Respiratory II: Physiology (24) > Alveolar Surface Tension > Flashcards

Flashcards in Alveolar Surface Tension Deck (17)
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1

What physical law describes the relationship between pressure, radius, and wall tension?

 

Law of Laplace

2

Which physical law states that as the radius of a sphere or cylinder becomes larger, the wall tension increases as well?

Law of Laplace

3

Which variables describe the Law of LaPlace?

Tension

Pressure

Radius

4

What's the Law of LaPlace equation in a cylinder?

Tension = Pressure x Radius

5

The Law of LaPlace equation in a cylinder can be applied to which structures in the body?

Blood vessels

Cylindrical aneurysms

6

What's the Law of LaPlace equation in a sphere?

Tension = (Pressure x Radius)/2

7

The Law of LaPlace equation in a sphere can be applied to which structures in the body?

Alveoli

Cardiac ventricles

Saccular aneurysm

8

Which substance reduces alveolar surface tension and prevents alveolar collapse?

Surfactant

9

Which substance makes it possible to maintain a constant surface tension regardless of alveolar size?

Surfactant

10

True or False: 

Each alveolus contains the same amount of surfactant

True

Each alveolus contains the same amount of surfactant

11

True or False:

Larger alveoli have a relatively smaller concentration of surfactant

True

Larger alveoli have a relatively smaller concentration of surfactant

12

True or False:

Smaller alveoli have a relatively large concentration of surfactant

True

Smaller alveoli have a relatively large concentration of surfactant

13

As the radius changes, what prevents smaller alveoli from collapsing and emptying into larger alveoli?

Surface tension remains constant.

14

Which type of products Surfactant?

Type II pneumocytes

15

Type II pneumocytes begin producing surfactant between -- and -- weeks gestation.

22 - 26 weeks gestation

16

Type II pneumocytes begin producing surfactant between 22 - 26 weeks with peak production occurring at --- to ---weeks.

 

35 - 36 weeks gestation

17

Reference:

 

Nagelhout. Nurse Anesthesia. 6th ed. 2018. p. 215 -216.