Tag: respiration in organism

Questions Related to respiration in organism

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

Show answer
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

Show answer
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

Show answer
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.

Show answer
Correct Option: D

On an average, a healthy man breathes % times per minute.

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

  1. $a = 9.8\ ml, b = 6000\ ml$ to $8000\ ml, c = 12\ to \ 16, d = 3$

  2. $a = 5\ ml, b = 500\ ml, c = 12\ to \ 16, d = -3$

  3. $a = 9.8\ ml, b = 5\ ml$ to $8000\ ml, c = 12\ to \ 16, d = 3$

  4. $a = 5\ ml, b = 6000\ ml$ to $8000\ ml, c = 18 times, d = 7$

Show answer
Correct Option: A

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

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

  1. Contraction of internal intercostal muscles

  2. Relaxation of phrenic muscles

  3. Relaxation of external intercostal muscles

  4. Both $(2)$ & $(3)$

Show answer
Correct Option: D
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'.

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

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

  1. Respiration rate

  2. Breathing rate

  3. Combustion rate

  4. None of the above

Show answer
Correct Option: A,B
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'.

Ribs moves out during

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

  1. Inhalation

  2. Exhalation

  3. Coughing

  4. Both A and B

Show answer
Correct Option: A
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'.

The average breathing rate of human beings

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

  1. 15-18 times

  2. 15- 25 times

  3. 10-20 times

  4. None of the above

Show answer
Correct Option: A
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'.

During which of the following activity the breathing rate is maximum?

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

  1. Sleeping

  2. Jumping

  3. Writing

  4. None of the above

Show answer
Correct Option: B
Explanation:
Breathing rate is maximum in jumping. Because heart rate is faster during jumping which makes quicker pulse. The muscles need more oxygen and more energy at this time. As level of activity increases, breathing rate increases to bring more air into the lungs so that lungs can pump more oxygen into the blood.
So the correct answer is 'Jumping'