Gas Exchange

When we inspire (inhale), our diaphragm does what?

• relaxes and moves down

• contracts and moves down

• contracts and moves up

• relaxes and moves up

What is the green part called?

• trachea

• air sac

• brochi

What do you call this part of the human lung (seen through a microscope)?

• air sacs/alveoli

• lung cells

• capillaries

• bronchioles

Blood which LEAVES the capillaries of the lungs have ______ carbon dioxide.

• more

• less

In the diagram, carbon dioxide diffuses from the air sac into the capillaries.

• true

• false

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

What happens to the volume and pressure in the lungs when we expire (exhale)?

• volume and pressure decreases

• volume and pressure increases

• volume decreases, pressure increases

• volume increases, pressure decreases

What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

What is sign for brain to send impulse for breathing?

• high CO₂ level

• low CO₂ level

• high O₂ level

• high blood concentration

Tags

NGSS.HS-LS1-3

A tiny air sac inside a lung, adapted to diffuse oxygen easily.

• Bronchiole

• Trachea

• Alveolus

• Nasal Passage

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Which of these is a way in which alveoli are adapted to work well?

• They are very large

• They have thick walls

• They have thin walls

• There are only a few of them