Lab quiz 3 ps5

Diaphragm

contraction and relaxation responsible for breath

Intercostal muscles

Assists in breathing

Intercostal cartilage

Allows rib cage to stretch

What are three factors necessary to breathe?

Diaphragm, intercostal muscles, intercostal cartilage

What volumes do we need to calculate vital capacity?

Vital Capacity = Inspiratory Reserve + Tidal Volume + Expiratory Reserve Volumes

tidal volume:

volume of air moved in and out during quiet breathing (normal range: 400- 600 mL)

inspiratory reserve volume

maximal volume inhaled after normal inspiration (normal range: 1700- 3000 mL)

expiratory reserve volume

maximal volume after normal expiration (normal range: 800- 1100 mL)

vital capacity

Volume of air maximally exhaled after deep inhalation. (IRV + TV + ERV)

How to measure vital capacity in females?

VC (in liters) = [(0.041) x (Height in centimeters) – (0.018) x (age)] -2.69

How to measure vital capacity in males?

VC (in liters) = [(0.052) x (Height in centimeters) – (0.022) x (age)] -3.60

What is forced expiratory volume (FEV1)?

Measures the air forcefully expired in 1.0 seconds.

What is the FEV1 in healthy individuals?

Healthy individuals should be able to exhale 83% of their vital capacity in 1 second (0.83 VC)

What if lungs became inelastic?

bronchioles collapses

Which muscles are involved in inhalation and exhalation?

inhalation: Diaphram, intercostal muscles

exhalation: Intercostal muscles, abs

Which is the correct order of complete
airflow through lung?

Trachea -> Primary Bronchus -> Secondary Bronchus -> Tertiary Bronchus -> Bronchiole -> Alveoli

Alveoli

site of gas exchange