Explanation text

What is the primary purpose of the respiratory system?

• To digest food

•  To circulate blood

• To produce sound

• To transmit signals to muscles

• To allow the exchange of gases

1. What initiates the process of breathing according to the passage?

• The diaphragm contracting on its own

• A message from the brain through nerves

•  The nose inhaling air

• The lungs expanding automatically

• The trachea opening up

1. Which of the following best describes the function of the epiglottis?

• Allows air to enter the lungs

• Filters out dust particles

• Prevents food from entering the airway

• Contracts to push air out of the lungs

• Directs air into the bloodstream

How does air pressure in the chest change during inhalation?

• It increases as the lungs expand.

•  It remains the same as air enters.

•  It decreases, causing air to rush in.

• It fluctuates with the heartbeat.

• It decreases as the ribs contract.

1. What happens in the alveoli?

• Air is purified and cleaned.

• Blood is circulated through the lungs.

• Oxygen enters the bloodstream, and carbon dioxide is expelled.

• Air is forced out of the lungs.

•  Carbon dioxide is converted into oxygen.

1. Which word is closest in meaning to "relaxes" as used in the passage?

• Expands

• Tightens

• Loosens

• Contracts

• Compresses

1. What can be inferred about the process of exhalation?

•  It involves the rib cage pushing inward.

• It happens automatically without any muscle movement.

• It does not involve any changes in chest pressure.

• It requires more energy than inhalation.

• It happens only when we are awake.

Which part of the respiratory system is responsible for directing air towards either the right or left lung?

• Pharynx

•  Bronchus

• Epiglottis

•  Diaphragm

•  Alveoli

1. The passage implies that breathing is primarily a(n) ______ process.

• conscious

• automatic

• complex

•  irregular

• voluntary

What is a synonym for "tiny" as used to describe the alveoli?

• large

• minute

• widespread

• thick

• moderate