Gas exchange in humans

The diagram below which shows the inner lining of a certain part of the human body. This inner lining can be found in

• the trachea.

• the air sacs.

• the capillaries.

• the small intestine.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Which of the following shows the correct sequence of air passage into the lungs?

• trachea → larynx → air sacs → bronchi

• larynx → trachea → bronchi → air sacs

• air sacs → larynx → trachea → bronchi

• larynx → bronchi → trachea → air sacs

The exhaled air from our body consists mostly of

• carbon dioxide.

• nitrogen.

• oxygen.

• water vapour.

Inhalation occurs from

• P to Q

• P to R

• R to S

• R to T

The lining of the nasal cavity is covered with a thin film of mucus. What is the importance of the mucus?

• It warms up the inhaled air.

• It helps remove dust from the incoming air.

• It lubricates the passage of air into the respiratory trac.

• It helps dissolve oxygen in the inhaled air for gas exchange.

What is the rate of breathing of this person at rest?

• 10 breaths per minute

• 12 breaths per minute

• 18 breaths per minute

• 24 breaths per minute

Which of the following correctly describes the functioning of the human breathing system?

• The bronchus cannot change its size.

• The nasal cavity has hairs to trap dust.

• The diaphragm muscle contracts during inhalation.

• The lung expels air through its muscular contraction.

The atmospheric pressure is lower at high altitude than at sea level. If someone gets to a place of higher altitude, his breathing rate increases. This is probably due to the fact that

• the heartbeat rate of a person is faster at higher altitude.

• the percentage of oxygen in air drops at higher altitude.

• the metabolic rate of a person is faster at higher altitude.

• the amount of oxygen inhaled in each breath of a person is lesser at higher altitude.

In a fire accident, during which period of time in the following graph would a large amount of hot smoke rush into the lungs?

• P to R

• Q to S

• R to T

• S to U

Which of the following are features of the air sacs that adapt them to gas exchange?

I. High surface area

II. Thin walls

III. Dry surfaces

• I and II only

• I only

• II and III

• I, II, and III