Basic structure of the rep system

Question 1

Bronchial tree and bronchioles

Answer 1

Bronchi held open by cartilage horseshoes and plates

Bronchiolar and alveolar surface tension reduced by surfactant

Question 2

Diameter of red cells

Answer 2

7 micrometres

Question 3

What drives oxygen across the blood-air barrier?

Answer 3

PO2 Air = 100 mm HG  PO2 Blood = 40 mm HG

Question 4

Position of diaphragm

Answer 4

Margin is attached to costal margin (lower edge of the rib cage)
Centre of dome bulges up because of pressure difference between pleural and abdominal cavities
Highest in expiration

Question 5

Phrenic nerves

Answer 5

C3,4,5 is Motor to diaphragm

Question 6

Roles of the abdominal muscles and the pelvic diaphragm

Answer 6

The function of the abdominal muscles are to protect the internal organs in the abdominal and pelvic regions and provide postural support. There is not one, but several muscles involved in the support of the abdominal area. Rectus abdominus is the large abdominal muscle in the center of the abdominal region. It controls pelvic tilt.