Circulatory and Respiratory System

White Blood Cells

• attack viruses only

• attack germs

• protect red blood cells

Capillaries

• connect arteries to veins, gasses are exchanged

• connect heart valves together

• connect arteries to other arteries

Arteries

• flexible, carry blood to the heart

• not flexible, carry blood away from the heart

• flexible, carry blood away from the heart

Veins

• not flexible, blood is a darker shade of red

• flexible, blood is a darker shade of red

• flexible, blood is a bright red

What is the purpose of heart valves?

• keep blood flowing in one direction

• pump the blood

Lungs

• 2 large organs containing oxygen

• 2 large organs containing carbon dioxide

Alveoli

• millions of tiny air pockets that exchange oxygen for carbon dioxide

• millions of tiny air pockets that contain oxygen

Trachea

• tissue that holds lungs together

• leads from the throat to the bronchial tubes

• leads from the throat to the lungs

Bronchi

• branches off from the trachea into each lung delivering oxygen

• branches off only to the left lung delivering oxygen

How many chambers are in the heart?

• 6

• 2

• 4

• 3