Tag: respiration in organism

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Questions Related to respiration in organism

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

All of the following statements are true except

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

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

  1. Presence of diaphragm

  2. Presence of pinna
  3. Presence of $7$ cervical vertebrae

  4. Testis in extra abdominal scrotal sac
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The diaphragm is a characteristic feature of all mammals, used for respiration. Other options like pinna, 7 cervical vertebrae, or scrotal sacs have exceptions among mammals.

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

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?

  1. A $>$ B $>$ C $>$ D
  2. D $>$ B $>$ A $>$ C
  3. A $>$ C $>$ B $>$ D
  4. B $>$ D $>$ C $>$ A
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

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.

  1. Four

  2. Three

  3. Two

  4. One
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (2) is correct because the chest expands, lowering intrapleural and intrapulmonary pressure, which causes air to enter. Statement (4) is correct since a healthy human typically breathes 12 to 16 times per minute. Statements (1) and (3) incorrectly reverse cause and effect.

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

The air we breathe out contains more

  1. Oxygen

  2. Carbon dioxide

  3. Water

  4. Chlorophyll
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. Lungs

  2. Membrane

  3. Diaphragm

  4. Pleura
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Which of the following statements is not correct?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

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