Author Question: What is normal amount of anatomic dead space found in a healthy lung? a. 1 ml/kg predicted body ... (Read 83 times)

newyorker26 · **on:** Jul 16, 2018

What is normal amount of anatomic dead space found in a healthy lung?

a. 1 ml/kg predicted body weight
b. 2 ml/kg predicted body weight
c. 3 ml/kg predicted body weight
d. 4 ml/kg predicted body weight

Question 2

Identify functions of airway mucus in the normal lung. 1. Increased mucus production decreases bronchospasm. 2. Protect the airways from excessive water loss. 3. Shield the airway from toxic particles. 4. Trap inhaled contaminants.

a. 1, 2, and 3 only
b. 2, 3, and 4 only
c. 1 and 4 only
d. 3 and 4 only

abro1885 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
These airways constitute the anatomic dead space of the respiratory system that is rebreathed with each breath. In the adult human, the volume filling the airways of the anatomic dead space is approximately 2 ml/kg of lean body weight, or approximately 150 ml in the typical adult.

Answer to Question 2

ANS: B
Mucus functions to protect the underlying tissue. It helps to prevent excessive amounts of water from moving into and out of the epithelia. It shields the epithelia from direct contact with poten-tially toxic materials and microorganisms. It acts like sticky flypaper to trap particles that make contact with it. This makes mucus an important part of the pulmonary defenses.