Gr 9 NATURAL SCIENCES: CH 1.4 Breathing

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What type of blood is pumped by the heart to the rest of the body?

Deoxygenated blood

Carbon dioxide-rich blood

Oxygenated blood (correct)

Nitrogen-rich blood

What is the main function of the diaphragm during inhalation?

It reduces the internal pressure

It relaxes and returns to its dome shape

It expands the rib cage

It contracts and flattens (correct)

What happens to the internal pressure during inhalation?

It decreases (correct)

It remains the same

It increases

It becomes negative

What is the role of the intercostal muscles during inhalation?

They contract and expand the rib cage Signup and view all the answers

What happens to the thoracic volume during exhalation?

It decreases Signup and view all the answers

What is the main function of the diaphragm during exhalation?

It relaxes and returns to its dome shape Signup and view all the answers

What is the role of the intercostal muscles during exhalation?

They relax and allow the rib cage to contract Signup and view all the answers

What is the purpose of the heart in the breathing mechanism?

To pump oxygenated blood to the rest of the body Signup and view all the answers

What happens to the diaphragm during inhalation?

It contracts and flattens, moving downwards. Signup and view all the answers

What happens to the volume of the chest cavity during exhalation?

It decreases. Signup and view all the answers

Where does gas exchange occur in the lungs?

In the alveoli. Signup and view all the answers

What is the function of haemoglobin in red blood cells?

To carry oxygen. Signup and view all the answers

What happens to oxygen during diffusion in the alveoli?

It diffuses from the alveoli into the blood. Signup and view all the answers

What is the role of the heart in the respiratory system?

To pump oxygenated blood to the body and deoxygenated blood to the lungs. Signup and view all the answers

During inhalation, what happens to the rib cage?

It moves upwards and outwards Signup and view all the answers

What is the process by which oxygen enters the blood in the alveoli?

Diffusion Signup and view all the answers

What is the purpose of the bronchioles in the lungs?

To branch into smaller airways Signup and view all the answers

What is the function of carbon dioxide in the respiratory system?

To be transported back to the lungs to be expelled Signup and view all the answers

What happens to the air during exhalation?

It travels from the lungs to the trachea Signup and view all the answers

What is the role of the capillaries in the alveoli?

To facilitate gas exchange Signup and view all the answers

What is the primary function of the trachea?

To connect the pharynx and larynx to the lungs Signup and view all the answers

What is the primary function of the heart in the breathing mechanism?

To pump oxygenated blood to the lungs Signup and view all the answers

What happens to the rib cage during inhalation?

It expands and increases in volume Signup and view all the answers

What is the result of the increased thoracic volume during inhalation?

Decreased internal pressure Signup and view all the answers

What happens to the diaphragm during exhalation?

It relaxes and returns to its dome shape Signup and view all the answers

What is the purpose of the intercostal muscles during breathing?

To expand and contract the rib cage Signup and view all the answers

What type of blood returns to the heart?

Deoxygenated blood Signup and view all the answers

What is the result of the decreased thoracic volume during exhalation?

Increased internal pressure Signup and view all the answers

What happens to the air during inhalation?

It flows into the lungs Signup and view all the answers

What is the primary function of the network of blood vessels in the breathing mechanism?

To transport oxygenated blood to the rest of the body Signup and view all the answers

Which muscle relaxes and returns to its original shape during exhalation?

Diaphragm Signup and view all the answers

What is the effect of increased thoracic volume on internal pressure during inhalation?

It decreases the internal pressure Signup and view all the answers

What is the net result of the breathing mechanism in terms of gas exchange?

Oxygen is added to the blood and carbon dioxide is removed Signup and view all the answers

What is the primary function of the heart in the context of the breathing mechanism?

To pump oxygenated blood to the rest of the body Signup and view all the answers

What is the effect of diaphragm contraction on the thoracic volume during inhalation?

It increases the thoracic volume Signup and view all the answers

What is the role of the intercostal muscles during breathing?

To expand and contract the rib cage Signup and view all the answers

What is the primary site of gas exchange in the breathing mechanism?

Alveoli Signup and view all the answers

What is the primary function of the bronchi in the lungs?

To branch into smaller airways, ultimately leading to the alveoli Signup and view all the answers

What is the effect of increased thoracic volume on the lungs during inhalation?

The lungs expand to fill the extra space, allowing air to be pulled into them Signup and view all the answers

What is the purpose of the alveoli in the lungs?

To facilitate the exchange of oxygen and carbon dioxide Signup and view all the answers

What happens to the oxygen that diffuses into the alveoli?

It binds to haemoglobin molecules in red blood cells Signup and view all the answers

What is the role of the capillaries in the alveoli?

To facilitate the exchange of oxygen and carbon dioxide Signup and view all the answers

What is the result of the decreased thoracic volume during exhalation?

The lungs are compressed, forcing air out of them Signup and view all the answers

What is the role of haemoglobin in red blood cells?

To bind oxygen, allowing it to be transported to the body Signup and view all the answers

Gr 9 NATURAL SCIENCES: CH 1.4 Breathing

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Questions and Answers

What type of blood is pumped by the heart to the rest of the body?

What is the main function of the diaphragm during inhalation?

What happens to the internal pressure during inhalation?

What is the role of the intercostal muscles during inhalation?

What happens to the thoracic volume during exhalation?

What is the main function of the diaphragm during exhalation?

What is the role of the intercostal muscles during exhalation?

What is the purpose of the heart in the breathing mechanism?

What happens to the diaphragm during inhalation?

What happens to the volume of the chest cavity during exhalation?

Where does gas exchange occur in the lungs?

What is the function of haemoglobin in red blood cells?

What happens to oxygen during diffusion in the alveoli?

What is the role of the heart in the respiratory system?

During inhalation, what happens to the rib cage?

What is the process by which oxygen enters the blood in the alveoli?

What is the purpose of the bronchioles in the lungs?

What is the function of carbon dioxide in the respiratory system?

What happens to the air during exhalation?

What is the role of the capillaries in the alveoli?

What is the primary function of the trachea?

What is the primary function of the heart in the breathing mechanism?

What happens to the rib cage during inhalation?

What is the result of the increased thoracic volume during inhalation?

What happens to the diaphragm during exhalation?

What is the purpose of the intercostal muscles during breathing?

What type of blood returns to the heart?

What is the result of the decreased thoracic volume during exhalation?

What happens to the air during inhalation?

What is the primary function of the network of blood vessels in the breathing mechanism?

Which muscle relaxes and returns to its original shape during exhalation?

What is the effect of increased thoracic volume on internal pressure during inhalation?

What is the net result of the breathing mechanism in terms of gas exchange?

What is the primary function of the heart in the context of the breathing mechanism?

What is the effect of diaphragm contraction on the thoracic volume during inhalation?

What is the role of the intercostal muscles during breathing?

What is the primary site of gas exchange in the breathing mechanism?

What is the primary function of the bronchi in the lungs?

What is the effect of increased thoracic volume on the lungs during inhalation?

What is the purpose of the alveoli in the lungs?

What happens to the oxygen that diffuses into the alveoli?

What is the role of the capillaries in the alveoli?

What is the result of the decreased thoracic volume during exhalation?

What is the role of haemoglobin in red blood cells?

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