Which of the following is/are responsible for the distribution of air in lungs?
a) trachea
b) larynx
c) bronchi
d) bronchioles
Where does the actual gaseous exchange between CO2 and O2 take place?
a) alveoli
b) larynx
c) bronchi
d) bronchioles
Explanation: Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs).
What is the thickness of the wall of an alveolus?
a) 1 mm
b) 3 mm
c) 1 µm
d) 0.1 µ or less
Lining of each alveolus is moist and consists of …….
a) ciliated columnar epithelium
b) squamous epithelium
c) ciliated cuboidal epithelium
d) both b and c
Explanation: This type of epithelium typically lines blood vessels and body cavities and regulates the passage of substances into the underlying tissue.
Which of the following allow/s alveoli to expand and recoil during breathing?
a) collagen fibre
b) layer of smooth muscle
c) elastic fibre
d) both a and c
In which of the
following cavity, lungs located?
a) abdominal cavity
b) pelvic region
c) thoracic cavity
d) cranial cavity
Explanation: thoracic cavity is also known as chest cavity
