EasyZoologyBreathing and Exchange of Gases
+4 / -1
Which muscle is the primary muscle of respiration?
A
External intercostal muscle
B
Internal intercostal muscle
C
Diaphragm
D
Sternocleidomastoid
Explanation
The diaphragm is the primary muscle of respiration, responsible for about 75% of the increase in thoracic volume during normal inspiration. It is a dome-shaped musculotendinous sheet separating the thoracic and abdominal cavities. External intercostals assist by elevating the ribs. Accessory muscles (sternocleidomastoid, scalenes) are used only during forced breathing.
Previous
The vital capacity of the lungs is defined as:
NextWhat percentage of CO₂ is transported as bicarbonate ions (HCO₃⁻) in the blood?
More from Breathing and Exchange of Gases
Medium
The figure given below shows a small part of human lung where exchange of gas takes place. In which
HardMatch the Following: (a) Asthma 1. Inflammation of nasal tract(b) Bronchitis 2. Spasm of tracheal mu
HardThe rate of breathing is primarily controlled by the concentration of:
MediumThe respiratory rhythm centre is located in the:
MediumThe enzyme required for the transport of CO2 as bicarbonate is:
MediumEvery 100 mL of deoxygenated blood delivers approximately ______ of CO2 to the alveoli.
Practice Zoology Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams