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 evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Respiratory membrane is

  1. Permeable

  2. Non permeable

  3. Semipermeable

  4. Can be of any type
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiratory membrane must be semi- permeable in nature to allow the passage of small molecules and ions. It should also support the process of diffusion. Only large molecules are transported using channels or porins. In root, the ascent of sap takes place through simple diffusion. If cell membrane was not semi permeable then it could have never happen. If it was permeable or impermeable then it is difficult for cell to survive. Thus, option C is correct.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Respiratory membrane should be

  1. Semipermeable.

  2. Non-permeable.

  3. Permeable.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Respiratory membrane must be semi- permeable in nature to allow the passage of small molecules and ions. It should also support the process of diffusion. only large molecules are transported using channels or porins. In root, the ascent of sap takes place through simple diffusion. If cell membrane was not semi permeable then it could have never happen. If, it was permeable or impermeable then it is difficult for cell to survive. 

Therefore, the correct answer is option A.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Smoke is inhaled by the 

  1. Digestive system.

  2. Respiratory system.

  3. Nervous system.

  4. Excretory system.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Smoking is a practice in which a substance is burned and the smoke is breathed in and absorbed into the bloodstream. Most commonly used substance is the dried leaves of the tobacco plant. Smoking is primarily practised for recreational drug use.
 The combustion of the dried plant leaves vaporizes and delivers active substances into the lungs where they are rapidly absorbed into the bloodstream and reach bodily tissue. 
Smoking generally has negative health effects, because smoke inhalation may cause effects on physiologic processes such as respiration.
Hence, the smoke inhaled by the respiratory system.
So, the correct option is ' the respiratory system'.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

If the thoracic wall but not lungs is punctured.

  1. The lungs get inflated

  2. The man dies as the lungs get collapsed

  3. The breathing rate decreases

  4. The breathing rate increases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Puncturing the thoracic wall (pneumothorax) disrupts the negative intrapleural pressure required to keep the lungs inflated against their natural elastic recoil, leading to lung collapse and respiratory failure.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Consider the following statements each with two blanks. 
(i)    Actually, only about (1)ml of air enters the lung alveoli for the exchange of gases.The remaining fills the respiratory passage and is termed (2).
(ii) The amount of air which one can inhale with maximum effort and also exhale with maximum effort is termed as (3) . It is about (4) in normal adult person.
(iii) During normal quiet breathing, on an average, approximately (5) ml of air is inspired or expired by adult human male in each breath. It is termed as (6) volume.
Which of the following options gives the correct fill ups for the respective blank numbers from (1) to (6) in the above statements?

  1. (3)-vital capacity, (4)-4000 mL, (5)-500, (6)-tidal

  2. (1)-100, (2)-residual volume, (3)-functional residual capacity, (4)-3000mL

  3. (1)-350,(2)-dead space air, (5)-1000,(6)-inspiratory reserve

  4. (1)-350, (2)-residual volume, (3)-vital capacity, (4)-4000 mL
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Actually, only about 350 mL of air (out of total 500 mL tidal volume) enters the lung alveoli for the exchange of gases. The remaining 150 mL fills the respiratory passage and is termed as dead air space because no exchange of gases takes place here.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Choose the correct answers from the alternatives given.
Generally the breathing system in birds:

  1. is identical to the human breathing system

  2. is merely accelerated by the flight muscles

  3. resembles the positive pressure system of a frog

  4. requires a flow-through bronchi-lung so constant oxygen absorption can meet the high oxygen demand
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Unidirectional flow means that air moving through bird lungs is largely 'fresh' air & has a higher oxygen content.  So, in bird lungs, more oxygen is available to diffuse into the blood. 

So the correct answer is "requires a flow-through bronchi-lung so constant oxygen absorption can meet the high oxygen demand".

Multiple choice zoology gas exchange in humans human respiration the mechanism of breathing breathing and its movements

Which of the following statement is incorrect about nasopharynx?

  1. Internal nostrils opens into nasopharynx

  2. It is the passage for air only

  3. It is a portion of pharynx

  4. Nasopharynx opens through the glottis of the larynx region into the trachea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nasopharynx is the upper part of the pharynx, located behind the nasal cavity. It serves as a passage for air only, not food. The statement that internal nostrils open into it is correct, but the claim that it opens through the glottis into the trachea is incorrect; the glottis is the opening to the larynx, which is located below the oropharynx.

Multiple choice zoology gas exchange in humans human respiration the mechanism of breathing breathing and its movements

Epiglottis is meant for protecting

  1. Oesophagus from entry of air

  2. Nasal chambers from entry of food

  3. Larynx from entry of food

  4. Teeth from caries
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The epiglottis is a flap of cartilage that covers the opening of the larynx during swallowing. This prevents food and liquids from entering the respiratory tract.

Multiple choice biology breath and blood of life human respiration the mechanism of breathing breathing and its movements

Which of the following option is correct regarding the characteristics of the diaphragm?


(A) Found in mammals.
(B) Separate the thoracic and Abdominal cavity.
(C) Formed by inter-costal muscles.
(D) Due to its contraction volume of thoracic cavity increases on Anterior-Posterior axis.

  1. A, C and D are correct

  2. A, B and D are correct

  3. B, C and D are incorrect

  4. A, B and C are incorrect
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The diaphragm is the type of skeletal muscle found in mammals which plays a major role in respiration. It is a dome-shaped structure and moves in and out at the time of respiration. Its muscles separate the thoracic cavity having heart and lungs from the abdominal cavity. 
  • During inhalation, the diaphragm contracts and chest cavity increases to get more oxygen while in exhalation diaphragm relaxes and the chest cavity decreases and releases carbon dioxide.

So, the correct option is 'Found in mammals, Separate the thoracic and Abdominal cavity, and Due to its contraction volume of the thoracic cavity increases on Anterior-Posterior axis'.

Multiple choice biology breath and blood of life human respiration the mechanism of breathing breathing and its movements

Which of the following changes occur in diaphargm relax and intercostal muscles when expiration of air takes place?

  1. External intercostal muscles relax and diaphargm contracts

  2. External intercostal muscles contract and diaphargm relax.

  3. External intercostal muscles contract and diaphargm relaxes

  4. External intercostal muscles and diaphargm contract
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology breath and blood of life human respiration the mechanism of breathing breathing and its movements

One of the following depend more on ribs and their muscles for breathing than diaphragm.

  1. Female (human)

  2. Monkey

  3. Kangaroo

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ribs and the various muscles of respiration aid in both inspiration and expiration, which require changes in the pressure within the thoracic cavity. The important respiratory muscles are the diaphragm, the external intercostal and the internal intercostal muscles. The ribs and the respiratory muscles work to achieve this by changing the dimensions of the thoracic cavity.
When a person inhales, the rib cage move out and up in order to accommodate the incoming air. On the other hand, when a person exhales, the rib cage move in, in order to expel the carbon dioxide. Both the external intercostal muscles and the internal intercostal muscles elevate the ribs, thus increasing the width of the thoracic cavity, while the diaphragm contracts to increase the vertical dimensions of the thoracic cavity, and also aids in the elevation of the lower ribs. The muscles that connect the ribs together ensure that the diaphragm can expand and contract appropriately as air is breathed in and expelled. Thus, in mammals, breathing depends more on ribs and their muscles for breathing than diaphragm.

Multiple choice biology breath and blood of life human respiration the mechanism of breathing breathing and its movements

______ is the muscle responsible in respiration.

  1. Diaphragm

  2. Muscle tissue

  3. Heart

  4. Lungs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diaphragm is a muscular and tendinous sheath that closes the opening between thorax and abdomen and is pierced by structures that pass between these two regions of the body. The diaphragm is the primary muscle of respiration. Diaphragm is the primary respiratory muscle of the body. It, on contraction, increases the vertical diameter of the chest cavity by pulling its central tendon downwards. In this way, the lungs get extra space to expand and air rushes into them.