Tag: respiration and excretion in animals

Quizzes (12) Questions (11)

Questions Related to respiration and excretion in animals

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Which of the following correctly illustrates the passage of oxygen in the respiratory system?

  1. Nostrils--> trachea--> bronchus--> bronchiole--> alveoli

  2. Nostrils--> trachea--> bronchiole--> alveoli

  3. Nostrils--> bronchiole--> alveoli

  4. Nostrils--> alveoli
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The pathway of air through the respiratory system is through 
nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange). Hence, Nostrils--> trachea--> bronchus--> bronchiole--> alveoli  is   the passage of oxygen in the respiratory system.
So, the correct answer is 'Nostrils--> trachea--> bronchus--> bronchiole--> alveoli'.
Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Diaphragm is 

  1. Dome shaped muscle

  2. Oblique muscle

  3. Round muscle

  4. Elongated muscle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The diaphragm is a part of the abdominopelvic cavity.
  •  It is located below the thoracic cavity and above the pelvic cavity.
  •  Its dome-shaped roof is the thoracic diaphragm, a thin sheet of muscle under the lungs, and its floor is the pelvic inlet, opening into the pelvis. Hence, the diaphragm is a dome-shaped muscle.
So, the correct answer is 'dome-shaped muscle'.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Bronchi divide into

  1. Bronchus

  2. Bronchioles

  3. Alveoli

  4. Air sacs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The bronchi (or bronchus) are the air passages into the lungs that begin at the end of the trachea. 
  • There are two bronchi, one for each lung. 
  • The bronchus divides into smaller branches known as segmental bronchi, which divide again into bronchioles, Hence, Bronchi divide into bronchioles.
So, the correct answer is 'bronchioles'.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

What is correct about human respiration?

  1. About $90\%$ of $CO _2$ is carried by haemoglobin as carbaminohaemoglobin

  2. Neural signals from pneumotaxic centre of pons can increase duration of inspiration

  3. Workers in grinding and store breaking industries may suffer from lung fibrosis

  4. Cigarette smoking leads to inflammation of bronchi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pneumotaxic center in the pons regulates respiratory rhythm by sending neural signals that can reduce the duration of inspiration and increase the respiratory rate. This is a key respiratory control mechanism. Option A is incorrect because about 70% of CO₂ is transported as bicarbonate, not by hemoglobin. Option C describes silicosis, not lung fibrosis. Option D - cigarette smoking causes bronchitis, not primarily inflammation of bronchi.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Which is not function of 'conductiing part' of respiratory system?

  1. Clears the air from foreign particles

  2. Humidifies the air

  3. Brings the air to body temperature

  4. It is site for diffusion of oxygen and carbon dioxide

  5. Transports air to alveoli
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The conducting part of the respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and bronchioles. Its primary functions are to transport, filter, warm, and humidify the air. The alveoli are the specific site for gas exchange, which is part of the respiratory zone, not the conducting zone.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Choose the correct statements with regard to human respiration:
(a) Inspiration is faciliated by contraction of phrenic and internal intercostal muscles
(b) Healthy human can inhale or exhale about $2000-3000$ml of air/min
(c) Functional residual capacity represents the volume of left out air in lungs after expiration
(d) Total lung capacity is the total volume of air that would be accomodated in the lunds after forced inspiration.

  1. a, c

  2. b, d

  3. c, d

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

Statement (c) is correct as functional residual capacity is the volume of air remaining in the lungs after a normal expiration. Statement (d) is correct as total lung capacity is the maximum volume of air the lungs can hold after a forced inspiration. Statement (a) is incorrect because inspiration is primarily facilitated by the diaphragm and external intercostal muscles, not internal ones. Statement (b) is incorrect because a healthy human typically breathes about 6000-8000 ml of air per minute.