Tag: evs

Questions Related to evs

Dead space is

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Upper respiratory tract

  2. Nasal chambers

  3. Alveolar space

  4. Lower respiratory tract

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Correct Option: A
Explanation:
  • Dead space of the respiratory system refers to the space in which oxygen ($O _2$) and carbon dioxide ($CO _2$) gasses are not exchanged across the alveolar membrane in the respiratory tract. 
  • Anatomic dead space specifically refers to the volume of air located in the segments of the respiratory tract that are responsible for conducting air to the alveoli and respiratory bronchioles but do not take part in the process of gas exchange itself. 
  • These segments of the respiratory tract include the upper airways, trachea, bronchi, and terminal bronchioles.
So, the correct option is 'Upper respiratory tract'.

Rate of breathing is controlled by.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Amount of freely available oxygen

  2. Carbon dioxide in blood

  3. Stress

  4. Muscular functions of the body

  5. All the above

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Correct Option: B

People migrated from planes to hills six months back.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Possess more RBCs with haemoglobin of low $O _2$ binding affinity

  2. Possess same RBCs with haemoglobin of high $O _2$ binding affinity

  3. Lose physical fitness to play games like football

  4. Suffer from altitude sickness with nausea and fatigue

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Correct Option: A

Rapid breathing is?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Tachypnea

  2. Hypercapnea

  3. Orthopnea

  4. Eupnea

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Correct Option: A

Which is true?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Abdominal breathing is predominant in women

  2. Thoracic breathing is predominant in men

  3. Both A and B

  4. Thoracic breathing is predominant in women

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Correct Option: A

Between breaths the interpleural pressure is approximately _______mm Hg less than atmospheric pressure.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. $1$

  2. $4$

  3. $8$

  4. $10$

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Correct Option: B

If a man from sea coast goes to Everest peak then

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. His breathing and heart beat will increase

  2. His breathing and heart beat will decrease

  3. His respiratory rate will decrease

  4. His heart beat will decrease

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Correct Option: A
Explanation:

(a) At high altitude, $PO _2$ of alveolar air falls because of low $O _2$ tension of tissues. So, $O _2$ is absorbed very quickly from alveoli, thus, increasing breathing rate. Heart beat also increases to supply required amount of O2 to tissues.



How the man's respiration will be affected if he ascends a height of 25000 feet

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. No effect on respiration

  2. Respiratory rate will be decreased

  3. Respiratory rate will be increased

  4. Anything can happen

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Correct Option: C
Explanation:

(c) The partial pressure of $O _2$ will fall drastically along with the fall in barometric pressure, So hypoxia will develop which causes increase in the rate of respiration.





Amount of air exchanged in breathing can be measured with

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Spherometer

  2. Barometer

  3. Spirometer

  4. Sphygmomanometer

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Correct Option: C
Explanation:

(c) Spirometry is the process of recording the changes in the volume movement of air into and out of lung and the instrument used for the purpose is called spirometer or respirometer.





People living at sea level have around 5 million $RBCs/mm^3$ of blood whereas those living at an altitude of 5400 m have around 8 million. This is due to

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. There is more UV radiation which enhances RBCs production

  2. People eat more nutritive food which helps in formation of more RBCs

  3. People get pollution free air to breathe with more oxygen becoming available

  4. Atmospheric $O _2$ level is less so that more RBCs are needed to absorb the required amount of $O _2$ to survive.

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Correct Option: D