Tag: human respiration

Questions Related to human respiration

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

  1. Oxidative decarboxylation of pyruvic acid requires the presence of enzyme pyruvate dehydrogenase.

  2. All living cells whether aerobic or anaerobic, perform glycolysis.

  3. Cyanide does not stop chemiosmosis.

  4. Respiratory chain uses ${O} _{2}$ as final hydrogen acceptor.

Show answer
Correct Option: C
Explanation:

Cyanide is an inhibitor of complex IV (in ETS) and other heme-containing enzymes of mitochondria. Thus, cyanide blocks ATP production in the cells.

In breathing movements, air volume can be estimated by 

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

  1. stethoscope

  2. hygrometer

  3. sphygmomanometer

  4. spirometer

Show answer
Correct Option: D
Explanation:

Spirometry is the process of recording the changes in the volume and movement of air in and out of the lungs and the instrument used for this purpose is called spirometer or respirometer.

All of the following statements are true except

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

  1. Contraction of diaphragm increases volume of thoracic cavity in cephalocaudal axis

  2. During normal breathing, intrapleural pressure is always subatmospheric

  3. High surfave tention of alveolar surfactant facilities inhalation

  4. Passive exhalation results from elastic recoil of chest wall and lungs

Show answer
Correct Option: B

Which of the following is true for all mammals without any exception?

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

  1. Presence of diaphragm

  2. Presence of pinna

  3. Presence of $7$ cervical vertebrae

  4. Testis in extra abdominal scrotal sac

Show answer
Correct Option: A

Given are the data on breathing rate, heart rate and body temperature of four different mammals A, B, C and D.

Animals Breathing Rate per min Heart Rate per min Body temperature $(^oC)$
A $160$ $500$ $36.5$
B $15$ $40$ $37.2$
C $28$ $190$ $38.2$
D $8$ $28$ $35.9$

Study the data and rank theses animals in descending order of surface area per unit volume?

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

  1. A $>$ B $>$ C $>$ D

  2. D $>$ B $>$ A $>$ C

  3. A $>$ C $>$ B $>$ D

  4. B $>$ D $>$ C $>$ A

Show answer
Correct Option: A

Read the following statements.
$(1)$ Chest expands because air enters into the lungs.
$(2)$ Air enters into the lungs because chest expands.
$(3)$ The muscles of the diaphragm contracts because air enters in the lungs.
$(4)$ A healthy human breathes $12-16$ times/minute.

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

  1. Four

  2. Three

  3. Two

  4. One

Show answer
Correct Option: A

The air we breathe out contains more

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

  1. Oxygen

  2. Carbon dioxide

  3. Water

  4. Chlorophyll

Show answer
Correct Option: B
Explanation:

  • The respiratory tract carries air from the mouth and nose to the lungs.
  • In the lungs, the gases oxygen and carbon dioxide are exchanged between the alveoli and the capillaries. 
  • Exhaled air contains less oxygen and more carbon dioxide, Hence, The air we breathe out contains more carbon dioxide.
So, the correct answer is 'carbon dioxide'.

Which of the following forms the floor of the chest cavity?

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

  1. Lungs

  2. Membrane

  3. Diaphragm

  4. Pleura

Show answer
Correct Option: C
Explanation:

  • The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest.
  •  It contracts and flattens when you inhale. 
  • This creates a vacuum effect that pulls air into the lungs.
  •  When you exhale, the diaphragm relaxes and the air is pushed out of lungs. Hence, diaphragm forms the floor of the chest cavity.
So, the correct answer is 'diaphragm'.

Which of the following statements is not correct?

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

  1. Taking in of oxygen is inhalation.

  2. Taking in of carbon dioxide is inhalation.

  3. Breathing rate is number of inhalation and exhalation in one minute.

  4. Giving out of carbon dioxide is exhalation.

Show answer
Correct Option: B
Explanation:

  • Respiration includes two processes: inhalation and exhalation.
  • Inhalation (also known as inspiration) occurs when air or other gases enter the lungs.
  •  And exhalation is the process by which the body expels carbon dioxide. Hence, Taking in of carbon dioxide is inhalation is a wrong statement.
So, the correct answer is 'Taking in of carbon dioxide is inhalation'.

Carbon dioxide in the expired air is more than that in inspired air because

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

  1. It is absorbed at the alveolar surface

  2. It is released at the alveolar surface

  3. Both A and B

  4. None of these

Show answer
Correct Option: B
Explanation:

Component                        Inspired air         Expired air
  $CO _2$                                    0.04%                   4%
Because carbon dioxide is released at the alveolar surface during the gaseous exchange between blood and alveoli.