Gas Exchange

When exercising, why do we need more oxygen?

• To quickly break down nutrients for energy.
• To store CO₂.
• To slow down our heart reate.

During exercise, breathing rate increases because our body needs more oxygen to continue to work. How does the oxygen get to our muscles?

• Oxygen moves at the same rate from muscles to alveoli
• Oxygen diffuses from capillaries to the alveoli.
• Oxygen diffuses from alveoli directly to muscles.
• Oxygen diffuses from alveoli to capillaries.

Diffusion is where molecules/particles move:

• from low concentrations to high concentrations
• from high concentrations to low concentrations
• concentrations do not matter
• where ever they need to go

Which way will the Oxygen particles move?

• They will move outside of the cell
• They will move inside the cell
• There will be no net movement because the Oxygen is at equilibrium

What is gas exchange?

• Inhalation of oxygen
• Exhalation of carbon dioxide
• When oxygen and carbon dioxide get diffused in the lungs

Tags

NGSS.MS-LS2-3

What are the alveoli?

• A type of blood vessel leading toward the heart
• A cavity that lets air pass through
• Air sacs in the lungs
• An organism that has lost the ability to breathe

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Oxygen moves from higher concentration in the:

• alveolus
• capillary
• blood

Oxygen will move from high concentration to lower concentration. This means oxygen will move from _____________ to the ______________.

• The heart to the blood
• The alveolus to the capillaries
• The capillaries to the alveolus
• The lungs to the blood

During gas exchange, what diffuses from the alveoli to the blood in the capillaries?

• Nitrogen
• Oxygen
• Carbon Dioxide
• Water (H20)

What do cells use the oxygen you inhale for?

• To move in the body
• To make ATP-energy
• To bring oxygen to the body
• To stay alive