Prepare for NEET Biology Breathing And Exchange Of Gases (Mechanism Of Breathing) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert insights to understand inspiration, expiration, and pressure-volume changes.
NEET Questions / Zoology / Breathing And Exchange Of Gases / Mechanism Of Breathing
During forced expiration, which of the following muscles are NOT actively involved?
External intercostal muscles
Internal intercostal muscles
Abdominal muscles
Quadratus lumborum
A patient presents with significantly reduced lung compliance. Which of the following is LEAST likely to be the cause?
Pulmonary fibrosis
Emphysema (in later stages)
Increased surfactant production
Respiratory distress syndrome (RDS) in newborns
How does the intrapleural pressure change during a forceful cough?
It remains consistently negative throughout the cough
It becomes slightly more negative than during quiet breathing
It initially becomes significantly more positive than atmospheric pressure
It briefly equals atmospheric pressure
In high-altitude environments, the partial pressure of oxygen is reduced. Which physiological change is LEAST likely to occur as an immediate response to this hypoxic condition?
Increased respiratory rate
Increased heart rate
Peripheral vasoconstriction
Decreased erythropoietin production
During quiet inspiration, the diaphragm contracts and the external intercostal muscles contract. This leads to:
A decrease in thoracic volume and an increase in intrapulmonary pressure
An increase in thoracic volume and an increase in intrapulmonary pressure
An increase in thoracic volume and a decrease in intrapulmonary pressure
A decrease in thoracic volume and a decrease in intrapulmonary pressure
A patient with a neuromuscular disorder experiences weakened intercostal muscles. How would this primarily affect their breathing?
Increased reliance on abdominal muscles for breathing
Reduced ability to expand the rib cage during inspiration
Impaired gas exchange at the alveolar level
Increased residual volume in the lungs
During inspiration, the diaphragm:
Contracts and flattens
Relaxes and domes upwards
Relaxes and flattens
Contracts and domes upwards
Which of the following is NOT directly involved in the regulation of breathing?
Medulla oblongata
Pons varolii
Cerebellum
Aortic and carotid bodies
The primary muscles involved in quiet expiration are:
Diaphragm and external intercostal muscles
Internal intercostal muscles and abdominal muscles
No muscles; it's a passive process
Diaphragm and abdominal muscles
What causes the decrease in intrapulmonary pressure during inspiration?
Contraction of the abdominal muscles
Increase in lung volume
Relaxation of the diaphragm
Decrease in thoracic volume
