Biology

Respiration and Gas Exchange

958 Questions

Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.

Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes

Respiration and Gas Exchange Questions

Multiple choice

The term collapsed lung is used for the disease

  1. acute bronchitis

  2. chronic bronchitis

  3. pneumothorax

  4. agonal respiration

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A collapsed lung or pneumothorax is the collection of air in the space around the lungs. This buildup of air puts pressure on the lung, so, it cannot expand as much as it normally does when one takes a breath.

Multiple choice

The diaphragm assists in

  1. Excretion of water

  2. Circulation of blood

  3. Digestion

  4. Respiration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The diaphragm assists in Respiration. When the scalenes and external intercostals contract while the diaphragm descends, your lungs inhale air. When your abdominal muscles contract and the diaphragm rises, you exhale.

Multiple choice

The word ‘exhale’ means

Directions: Read the passage and answer the question.

The functional declines of advancing age are depressing. The heart’s ability to pump blood drops about one per cent: blood flow to arms and legs decreases by thirty to forty per cent in old age. The amount of air a person can exhale after a deep breath lessens and the chest wall stiffens with age. However, recent studies have shown that most of these age associated declines can be delayed by exercise. Exercise lowers the resting heart - rate and increases the amount of blood pumped with each beat in older people. When stress is placed on bones through exercise, calcium content rises, with the result that resistance to fracture is improved.

  1. breathe in

  2. breathe out

  3. breathe slowly

  4. breathe fast
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Means: to breathe out air or oxygen.

Multiple choice

Where does the oxygen carried through inhalation ultimately reach?

  1. Bronchioles

  2. Bronchus

  3. Trachea

  4. Alveoli
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Found in the lung parenchyma, the pulmonary alveoli are the terminal ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well.

Multiple choice

Trachea bifurcates at the level of

  1. 2nd cervical vertebra

  2. 4th cervical vertebra

  3. 5th cervical vertebra

  4. 7th cervical vertebra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trachea bifurcates at the level of 4th cervical vertebra.It divides into the right and left main bronchi and is marked internally by the presence of a carina or keellike ridge between the diverging bronchi.

Multiple choice

How is respiration accomplished in arthropods?

  1. By lungs and gills

  2. By book lungs and tracheae

  3. By lungs and tracheae

  4. By book lungs, tracheae and gills
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Respiration is accomplished in arthropods by book lungs, tracheae and gills.

Multiple choice

In normal expiration, the diaphragm is

  1. Arched

  2. Flattened

  3. Perforated

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During inhalation, the diaphragm contracts, thus enlarging the thoracic cavity (the external intercostal muscles also participate in this enlargement). This reduces intra-thoracic pressure: in other words, enlarging the cavity creates suction that draws air into the lungs.