8.2 Mechanisms of Breathing

Report 1 / 5

What happens when a person exhales after taking a deep breath?

	Rib cage	Diaphragm	External intercostal muscles
(A)	Inwards	Dome-shaped	Relax
(B)	Outwards	Flattens	Relax
(C)	Inwards	Dome-shaped	Contract
(D)	Outwards	Flattens	Contract

Difficulty Level: Medium

Report 2 / 5

The diagram shows a stage in the human breathing mechanism.

What caused the situation to occur?

(A)		The volume of the thoracic cavity decreases and the pressure of the thoracic cavity increases

(B)		External intercostal muscles relax

(C)		The diaphragm muscles relax and return to the dome shape

(D)		The volume of the thoracic cavity increases and the pressure of the thoracic cavity decreases

Difficulty Level: Medium

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Under which condition does air enters the bucco-pharyngeal cavity of a frog?

	Nostrils	Glottis	The floor of bucco-pharyngeal cavity
(A)	Opened	Closed	Lowered
(B)	Closed	Opened	Raised
(C)	Opened	Opened	Lowered
(D)	Closed	Closed	Raised

Difficulty Level: Medium

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Which of the following is correct during inhalation for a fish?

I.		Mouth open

II.		The floor of buccal cavity lowers

III.		Operculum cavity enlarges

IV.		Operculum closes

Difficulty Level: Medium

Report 5 / 5

Which of the following is the correct sequence of oxygen gas pathways when entering the respiratory system of humans?

(A)		\(\text{Alveoli}\rightarrow\text{bronchioles}\rightarrow\text{bronchi}\rightarrow\text{trachea}\)

(B)		\(\text{Alveoli}\rightarrow\text{bronchioles}\rightarrow\text{trachea}\rightarrow\text{bronchi}\)

(C)		\(\text{Trachea}\rightarrow\text{bronchi}\rightarrow\text{bronchioles}\rightarrow\text{alveoli}\)

(D)		\(\text{Trachea}\rightarrow\text{bronchioles}\rightarrow\text{bronchi}\rightarrow\text{alveoli}\)

Difficulty Level: Easy