Respiratory- Circulation and Lungs

Question 1

Pulmonary circulation vs bronchial circulation

Answer 1

Pulmonary circulation
• Pulm. arteries wrap around areolar sacs
• Diffusion of oxygen + CO

Bronchial circulation
• Blood supply from aorta to supply lungs, muscles supporting lungs

Question 2

Conducting Epithelium vs Respiratory Epithelium

Answer 2

• Conducting: contain cartilage rings- prevent collapse

Question 3

characteristics of conducting vs respiratory epithelium

Answer 3

• Cilia disappears in respiratory epithelium= tiny spaces prevents movement of mucus
• Club cells more prolific in lower conducting part
• Elastic fibres: all way as requires stretch (elastic potential energy= aids in recoil of lungs)

Question 4

where are lymphocytes often clustered in lungs

Answer 4

around veins bc limited tissue in lung

Question 5

Identify Artery, Vein, Bronchiole

Answer 5

• Bronchiole= cartilage (blue), Smooth muscle (red), lymphocytes bunch (green), epithelium columnar + darker + thicker

Question 6

alveolar membrane

Answer 6

cuboidal, erythrocytes

Question 7

respiratory bronchiole cells + role

Answer 7

• Simple Cuboidal club cells line the surface of the smooth muscle (SM) respiratory bronchioles.
o CC secrete pulmonary secretglobins (similar to pulmonary surfactant) which protect bronchiole epithelium

Question 8

what does surfactant do

Answer 8

reduces surface tension of blood/air barrier

o If premature child: cant produce surfactant + lungs cant expand(cant overcome pressure) > given surfactant

Question 9

what exists in septum of alveoli

Answer 9

cuboidal w/ surfactant granules

Question 10

function of type 1 and 2 pneumocytes

Answer 10

• Type I: squamous cell part of air blood barrier)

* Type II: rounded nucleus surrounded by noticeable amount of cytoplasm. Produces surfactant.