Question

i. Hemoglobin is a protein that carries oxygen. Please tell which of the following statements are correct.

a. when PO2 is low (30-40mmhg) the hemoglobin protein saturation increases

b. when PO2 is high (75-100mmhg) the hemoglobin protein is almost entirely saturated

c. when PO2 is high (75-100mmhg) the hemoglobin saturation is low

d. all of the above

ii. Blood circulation to lungs includes two systems. Identify which statement most accurately describes the blood circulation present int he lungs.

a. The pulmonary artery brings oxygenated blood from the right ventricle and the bronchial artery carries venous blood for gas exchange

b. The pulmonary artery is involved in the delivery of nutrients to the pulmonary tissues, whereas the bronchial artery is involved in the exchange of gasses

c. The pulmonary artery carries venous blood from the right ventricle and the bronchial artery carries oxygenated blood to deliver oxygen and nutrients to pulmonary tissues

d. The pulmonary artery and veins supply nutrients and oxygen to the lungs, whereas bronchial arteries and veins involve gas exchange in the alveoli

iii. The air passageway from the nostrils to the alveoli includes

a. Nostrils, Conchae, Larynx, Trachea - esophagus junction, bronchi, bronchioles, and alveoli

b. Nostrils, Conchae, Pharynx, Trachea, Bronchus, bronchioles, alveolar sacs, and alveoli

c. Nostrils, Pharynx, Trachea, Bronchioles, Bronchi, and alveoli

d. Nostrils, Sinuses, Pharynx, Trachea, Bronchioles, and alveoli

iv. The mucociliary system in the respiratory tract

a. remove particles that have been inhaled and deposited in the tract

b. allows particles to be encapsulated and form abscesses

c. performed only by macrophages and white blood cells

d. all of the above

Answer 1

1) option B is correct because partial pressure of oxygen is directly proportional to hemoglobin saturation of oxygen. At 75-100mmHg pressure, hemoglobin is totally saturated.

2) option C is correct. The pulmonary artery carries deoxygenated blood from right ventricle to lungs. Lungs gets its oxygen and nutrients from bronchial artery.

3) option B is correct. Esophagus is not a part of respiratory system.

4) option A is correct.

Mucocilliary system provide movement of inhaled particles out of respiratory tract and keep the tract clean. The other two options are incorrect.