Respiratory System: Primary Muscles of Inhalation

Question 1

2 Primary Inhalation muscles:

Answer 1

Diaphragm
External Intercostals

Question 2

Diaphragm

Answer 2

Dome-shape floor of Thoracic cavity and ceiling of abdominal viscera
unpaired
Linked to lungs via parietal membrane

Question 3

Diaphragm Attachments

Answer 3

Sternum
Lower ribs
Lumbar Vertebrae
Central Tendon (Diaphragmatic Aponeurosis)

Question 4

Passageways of Diaphragm

Answer 4

Aortic Hiatus
Esophageal Hiatus
Foramen Vena Cava

Question 5

Aortic Hiatus

Answer 5

Passageway for the Aorta (Major blood vessel that carries oxygenated blood from heart)

Question 6

Esophageal Hiatus

Answer 6

Passageway for Esophagus

Question 7

Foremen Vena Cava

Answer 7

Hollow Vein
Major vein returning to heart with deoxygenated blood

Question 8

Diaphragm Function

Answer 8

Vertical expansion of TC
When Diaphragm contracts, flattens and pushes down on the abdominal viscera
Abdominal wall expands/rises, TC has more vertical volume

(also transverse and anteroposterior expansion)

Question 9

External intercostals Attachments

Answer 9

Lower border of one rib to the upper boarder of rib below
Fills space between all 12 ribs except for the anterior space (costal cartilage)

Question 10

External intercostals functions

Answer 10

Can be activated individually or all at once
Raises rib cage up
Results in transverse/anteroposterior expansion