Question 1

Which of the following is not a function of the mammalian lungs in gas exchange?

Accepted Answer

Production of red blood cells

Answer

Moistening and warming of inspired air

Answer

Diffusion of oxygen into the blood

Answer

Diffusion of carbon dioxide out of the blood

Question 2

During expiration in humans, which of the following muscles relaxes?

Accepted Answer

Internal intercostal muscles

Answer

Diaphragm

Answer

External intercostal muscles

Answer

Abdominal muscles

Question 3

Which structure in the mammalian respiratory system is responsible for filtering out foreign particles?

Accepted Answer

Trachea

Answer

Bronchioles

Answer

Bronchi

Answer

Alveoli

Question 4

Which of the following gas exchange surfaces in mammals has a large surface area and is rich in blood vessels?

Accepted Answer

Alveoli

Answer

Bronchi

Answer

Trachea

Answer

Bronchioles

Question 5

What is the main respiratory pigment in humans that carries oxygen in the blood?

Accepted Answer

Hemoglobin

Answer

Myoglobin

Answer

Hematocrit

Answer

Erythropoietin

Question 6

Which of the following adaptations in the alveoli increases the efficiency of gas exchange in mammals?

Accepted Answer

Thin walls

Answer

Small surface area

Answer

Lack of blood supply

Answer

Thick walls

Question 7

Which of the following gases is not involved in gas exchange in the mammalian respiratory system?

Accepted Answer

Nitrogen

Answer

Water vapor

Answer

Carbon dioxide

Answer

Oxygen

Question 8

What is the role of surfactant in the mammalian respiratory system?

Accepted Answer

Reducing surface tension in the alveoli

Answer

Producing mucus in the airways

Answer

Increasing blood supply to the alveoli

Answer

Regulating breathing rate

Question 9

Which of the following is true about the mammalian respiratory system?

Accepted Answer

Gas exchange occurs in the alveoli

Answer

Gas exchange occurs in the trachea

Answer

Air is warmed in the bronchi

Answer

Oxygen is released in the bronchioles

Question 10

What is the role of the diaphragm in the process of breathing in mammals?

Accepted Answer

Contraction of the diaphragm increases the volume of the thoracic cavity

Answer

The diaphragm controls blood flow to the lungs

Answer

The diaphragm helps in vocalization

Answer

Relaxation of the diaphragm decreases lung volume

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