Human Biology

http://www.ck12.org Chapter 1. Human Biology

FIGURE 1.59

Gas exchange is the movement of oxygen

into the blood and carbon dioxide out of

the blood.

Vocabulary

• alveoli: Tiny sacs in the lungs where gas exchange takes place.


• aorta: Largest artery; receives blood directly from the heart.


• capillary: Smallest type of blood vessel that connects very small arteries and veins.

Summary

• Oxygen enters the lungs, then passes through the alveoli and into the blood. The oxygen is carried around the
  body in blood vessels.


• Carbon dioxide moves into the blood capillaries and is brought to the lungs to be released into the air during
  exhalation.

Practice

Use the resource below to answer the questions that follow.

• Gaseous Exchangeat http://www.youtube.com/watch?v=AyUtdqiOgCA (3:09)

MEDIA

Click image to the left for more content.

1. What causes oxygen to enter the blood? Where does this occur?


2. What causes carbon dioxide to exit the blood? Where does this occur?


3. How does hemoglobin carry oxygen through the blood?


4. How does oxygen enter the tissues of the body? Where does this occur?