Gas Exchange in Human

What are the two main organs for breathing called?

• Lungs

• Liver

• Kidneys

• Heart

What muscle helps us breathe by moving up and down?

• intercostal muscles

• abdominal muscles

• pectoralis major

• diaphragm

What do we call the bones that protect our chest?

• Vertebrae

• Sternum

• Ribs

• Clavicle

What is the name of the tube that carries air to the lungs?

• bronchi

• trachea

• esophagus

• alveoli

What are the tiny air sacs in the lungs called?

• trachea

• alveoli

• alveolar ducts

• bronchi

What happens to the air we breathe out compared to the air we breathe in?

• The air we breathe out has less oxygen and more carbon dioxide than the air we breathe in.

• The air we breathe out is completely free of carbon dioxide.

• The air we breathe out contains more nitrogen than the air we breathe in.

• The air we breathe out has the same amount of oxygen as the air we breathe in.

How does our breathing change when we run or play?

• Our breathing rate decreases and becomes shallower.

• We hold our breath while running or playing.

• Our breathing remains the same regardless of activity.

• Our breathing rate increases and becomes deeper.

What do we call the muscles between the ribs that help us breathe?

• intercostal muscles

• diaphragm

• abdominal muscles

• pectoralis major

What is the name of the part of the throat that helps us speak?

• Larynx

• Trachea

• Esophagus

• Pharynx

Why do we need to breathe faster when we exercise?

• To increase heart rate and improve stamina.

• We need to breathe faster during exercise to supply more oxygen to the muscles and remove carbon dioxide.

• To enhance flexibility and balance while exercising.

• To cool down the body temperature during workouts.