Biology Chapter 9 Entry test MCQs
76. A cavity bounded by ribs and diaphragm is called:
a. Pelvic cavity
b. Abdominal cavity
c. Pleural cavity
d. Thoracic cavity
77. Diameter of bronchioles is:
a. 1um
b. 1mm
c. 1nm
d. 0.1mm
78. Bronchioles are made up of mainly:
a. Circular smooth muscles
b. Connective tissues
c. Endothelial cells
d. Goblet cells
79. Functional units of lungs are:
a. Air sacs
b. Alveoli
c. Epithelial cells
d. Bronchioles
80. Each air sac consists of several microscopic alveoli which are:
a. Triple layered structures
b. Double layered structures
c. Multi layered structures
d. Single layered structures
81. A sheet of skeletal muscles forming the floor of chest cavity is called:
a. Diaphragm
b. Pleura
c. Serosa
d. Peritoneum
83. The function of nasal cavity is:
a. Protection
b. Moisten
c. Temperature regulation
d. All A, B and C
84. The epithelium of alveoli is:
a. Cuboidal epithelium
b. Ciliated epithelium
c. Columnar epithelium
d. Squamous epithelium
85. How many functional pairs of vocal cords are present in humans?
a. 2
b. 1
c. 4
d. 3
86. Trachea lies—————to the esophagus.
a. Ventral
b. Dorsal
c. Lateral
d. Medial
87. ————–are folds of tissue within the larynx, creates sounds when vibrate.
a. Glottis
b. Vocal cords
c. Trachea
d. Epiglottis
88. Human pharynx is conventionally divided into———–sections.
a. 3
b. 1
c. 4
d. 2
89. The respiratory bronchioles terminate in elongated airways called:
a. Alveolar duct
b. Alveolar sacs
c. Alveoli
d. Bronchi
90. Cartilage rings present in trachea which prevent it from collapsing and keep the air passage way open, are:
a. “D” shaped
b. “O” shaped
c. “G” shaped
d. “C” shaped
91. Vocal cords are stretched across:
a. Pharynx
b. Larynx
c. Bronchi
d. Glottis
92. Site of gaseous exchange in humans is:
a. Alveoli
b. Trachea
c. Nose
d. Bronchus
93. During breathing air from pharynx enters to:
a. Bronchioles
b. Alveoli
c. Trachea
d. Bronchi
94. Respiratory tubules are termed as bronchioles when they attain the diameter of———-or lesser.
a. 1 cm
b. 1.2 cm
c. 1.2 mm
d. 1 mm
96. In the passageways of the respiratory system mucus secreting cells called:
a. Surfactant cells
b. Tracheal cells
c. Pleural cells
d. Goblet cells
97. Function of respiratory passage, cilia is to keep the airways clear from:
a. Dust
b. CO2
c. CO
d. O2
Mechanism of Breathing
98. The chemical nature of surfactant is:
a. Glycoproteins
b. Glycolipids
c. Lipoproteins
d. Nucleoproteins
99. In humans, the respiratory center is:
a. Pons
b. Cerebrum
c. Midhrain
d. Medulla oblongata
100. Inspiratory center is———-portion of medulla:
a. Ventral
b. Lateral
c. Dorsal
d. Both B & C