Lesson on Human Respiratory System

What question is being explored in today's lesson?

• How does the heart pump blood?

• What happens when we inhale and exhale?

• How do we digest food?

• What is the role of the kidneys?

What happens to the lungs when we breathe in?

• They contract in size.

• They expand in size.

• They remain the same size.

• They deflate completely.

What happens to the diaphragm during inhalation?

• It contracts and flattens

• It expands and rises

• It remains unchanged

• It contracts and rises

Which muscles are responsible for pulling the ribs outward during inhalation?

• Abdominal muscles

• Intercostal muscles

• Pectoral muscles

• Trapezius muscles

What effect does inhalation have on the size and air pressure of the lungs?

• Decreases size and increases pressure

• Increases size and decreases pressure

• Increases size and increases pressure

• Decreases size and decreases pressure

What happens to the diaphragm during exhalation?

• It contracts and flattens

• It moves back up into a dome shape

• It remains flat

• It expands outward

What is the role of intercostal muscles during exhalation?

• They contract to expand the chest

• They relax to allow the ribs and lungs to move inward

• They contract to pull the ribs downward

• They remain unchanged

What happens to the size of the lungs and air pressure inside them during exhalation?

• Lungs increase in size and air pressure decreases

• Lungs reduce in size and air pressure increases

• Lungs remain the same size and air pressure remains constant

• Lungs reduce in size and air pressure decreases

What happens to air pressure inside the body when breathing in?

• It becomes higher than outside air pressure.

• It becomes lower than outside air pressure.

• It remains the same as outside air pressure.

• It fluctuates randomly.

During exhalation, how does air travel in relation to pressure areas?

• From low pressure to high pressure.

• From high pressure to low pressure.

• From equal pressure to equal pressure.

• It does not travel.