Tag: human respiration

Quizzes (0) Questions (83)

Questions Related to human respiration

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.

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

Which of the following does not happen in normal quiet exhalation?

  1. Contraction of internal intercostal muscles

  2. Relaxation of phrenic muscles

  3. Relaxation of external intercostal muscles
  4. Both $(2)$ & $(3)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Exhalation is a passive process because of the elastic properties of the lungs. During forced exhalation, internal intercostal muscles which lower the rib cage and decrease thoracic volume while the abdominal muscles push up on the diaphragm which causes the thoracic cavity to contract. 

So the correct answer is 'Relaxation of phrenic muscles and Relaxation of external intercostal muscles'.

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

The number of time a person breathes in a minute is known as

  1. Respiration rate

  2. Breathing rate

  3. Combustion rate

  4. None of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Breathing rate is also called respiratory rate. It is defined as the number of times a person breathes per minute. The normal respiratory rate for an adult at rest is 12 to 20 breathes per minutes. 
So the correct answer is 'Both A and B'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Ribs moves out during

  1. Inhalation

  2. Exhalation

  3. Coughing

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
During inhalation, the ribs move out. This is because the external intercostal muscles are present between ribs. The contraction of these muscles lifts ribs and sternum up and outward causing an increase in the volume of the thoracic cavity in the backwards-forward direction.
So the correct answer is 'Inhalation'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

The average breathing rate of human beings

  1. 15-18 times

  2. 15- 25 times

  3. 10-20 times

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The breathing rate is defined as the no. of times a person breath in one minute. The normal breathing in an adult person is 15 to 18 times per minute. The increase or decease in breathing rate leads to abnormal breathing rate.
So the correct answer is '15-18 times'.