Tag: evs

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

Dead space is

  1. Upper respiratory tract

  2. Nasal chambers

  3. Alveolar space

  4. Lower respiratory tract
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Rate of breathing is controlled by.

  1. Amount of freely available oxygen

  2. Carbon dioxide in blood

  3. Stress

  4. Muscular functions of the body

  5. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The rate of breathing in humans is primarily regulated by the concentration of carbon dioxide in the blood. Chemoreceptors detect changes in CO2 levels and pH, signaling the brain to adjust the ventilation rate to maintain homeostasis.

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

People migrated from planes to hills six months back.

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

At high altitudes, the partial pressure of oxygen is lower. To compensate for the reduced oxygen availability, the body increases the production of red blood cells and alters hemoglobin affinity to facilitate better oxygen delivery to tissues.

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

Which is true?

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

Physiological studies have historically observed that abdominal breathing is more common in women, while thoracic (chest) breathing is more common in men. This is a general anatomical and physiological trend.

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

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

  1. $1$
  2. $4$
  3. $8$
  4. $10$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The intrapleural pressure is normally negative relative to atmospheric pressure to keep the lungs inflated. This pressure is typically about 4 mm Hg lower than the atmospheric pressure between breaths.

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

If a man from sea coast goes to Everest peak then

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.



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

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

  1. No effect on respiration

  2. Respiratory rate will be decreased

  3. Respiratory rate will be increased

  4. Anything can happen
Reveal answer Fill a bubble to check yourself
C Correct answer
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.





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

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

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

At high altitudes, the partial pressure of oxygen is lower. The body compensates for this hypoxia by increasing the production of red blood cells (erythropoiesis) to increase the oxygen-carrying capacity of the blood.