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WorksheetsRespiratory and Muscle Physiology Quiz
Total questions: 15
Worksheet time: 1hrs 11mins
The primary pathological difference between emphysema and chronic bronchitis in COPD is:
Reversible bronchoconstriction
Destruction of alveolar septa in emphysema
IgE-mediated inflammation
Accumulation of pleural fluid
Asthma attacks are triggered mainly due to:
Reduced surfactant secretion
Type I hypersensitivity reaction
Type IV immune response
Bacterial toxin release
Which occupational lung disease is caused by inhalation of asbestos fibres and increases the risk of mesothelioma?
Silicosis
Byssinosis
Asbestosis
Anthracosis
In pneumonia, gas exchange is impaired mainly due to:
Collapse of alveoli
Bronchial muscle spasm
Filling of alveoli with inflammatory exudate
Reduced hemoglobin synthesis
Which symptom is most characteristic of chronic bronchitis?
Dry cough only at night
Productive cough for at least 3 months in 2 consecutive years
Sudden chest pain
Acute wheezing only
Hypoxia in COPD patients persists even after oxygen therapy because of:
Reduced lung volume
V/Q mismatch and diffusion limitation
Reduced hemoglobin concentration
Cardiac failure
The most appropriate long-term management strategy for asthma includes:
Antibiotics
Short-acting β₂ agonists only
Inhaled corticosteroids
Antihistamines alone
A skeletal muscle fibre is best described as:
Mononucleated spindle-shaped cell
Multinucleated cylindrical cell
Binucleated branched cell
Flattened contractile cell
The functional unit of a myofibril is the:
Myosin filament
Actin filament
Sarcomere
Z-disc
During muscle contraction, which band remains unchanged in length?
I band
H zone
A band
Z band
The role of ATP during muscle contraction is to:
Bind actin to troponin
Break the actin-myosin cross-bridge
Release calcium from sarcoplasmic reticulum
Maintain rigor state
T-tubules primarily function to:
Store calcium ions
Synthesize ATP
Transmit action potential into muscle fibre
Anchor actin filaments
During contraction, the Z-lines of a sarcomere:
Move away from each other
Disintegrate
Move closer to each other
Remain stationary
Calcium ions initiate muscle contraction by binding to:
Myosin head
Tropomyosin
Troponin
Actin
Which condition would most directly reduce oxygen delivery to actively contracting skeletal muscles?
Increased myosin ATPase activity
Pulmonary emphysema reducing alveolar surface area
Increased sarcoplasmic reticulum calcium release
Shortened I band during contraction
