IGCSE Biology Paper-4: Specimen Questions with Answers 167 - 168 of 279

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Passage

Shows the human gas exchange system. The functions of the parts of the gas exchange system are given in Table.

Human Gas Exchange System

Question 167 (1 of 2 Based on Passage)

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Short Answer▾

The gas exchange system contains cartilage.

Describe the function of cartilage in the gas exchange system.

Explanation

Cartilage

  • Keeps the airways open and air resistance low, and prevents them from collapsing or bursting as the air pressure changes during breathing. The purpose of the hyaline cartilage C-rings in the respiratory system, or more specifically in the trachea is to allow for the expansion of the underlying esophagus when food or liquids pass through.
  • Cartilage present in Trachea and Bronchus.

Question 168 (2 of 2 Based on Passage)

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Complete Table.

The Functions of the Parts of the Gas Exchange System
functionletter on Fig.name
structure that makes sounds
bone that provides protection for the lungs
airway that allows passage of air only into the right lung
airway that allows passage of air into both lungs
site of gas exchange
muscle that contracts to lower the ribcage
contracts to increase volume of thorax

Explanation

The Functions of the Parts of the Gas Exchange System
functionletter on

Fig. 19.1

name
structure that makes soundsPLarynx
bone that provides protection for the lungsTRibs
airway that allows passage of air only into the right lungCRight main bronchus
airway that allows passage of air into both lungsQTrachea
site of gas exchangeSAlveoli
muscle that contracts to lower the ribcageMDiaphragm
contracts to increase volume of thoraxEExternal intercostal muscle

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