Circulatory

What are the three types of blood vessels?

Hint: One type carries blood away from the heart, one carries blood back, and one connects them.

Which type of blood vessel carries blood AWAY from the heart?

Hint: 'A' for Arteries, 'A' for Away.

Which type of blood vessel carries blood BACK to the heart?

Hint: These vessels often have valves to prevent blood from flowing backward.

What is the liquid part of blood called?

Hint: It is a yellowish fluid that makes up about 55% of blood.

What type of blood cell carries oxygen throughout the body?

Hint: They contain hemoglobin, which binds to oxygen.

What type of blood cell fights infection and disease?

Hint: They are part of the immune system.

What are the cell fragments that help blood clot to stop bleeding?

Hint: When you get a cut, these rush to the site and stick together.

What protein in red blood cells binds to oxygen and gives blood its red color?

Hint: 'Hemo' means blood, and 'globin' refers to a protein.

Why are capillaries important for the circulatory system?

Hint: Capillary walls are only one cell thick.

Which blood vessels have valves to prevent blood from flowing backward?

Hint: Blood in these vessels flows against gravity when returning from the legs.

About how many quarts (or liters) of blood does the average adult body contain?

Hint: It is a little more than a gallon.

Which type of blood vessel has the thickest, most muscular walls?

Hint: They must withstand the high pressure of blood being pumped directly from the heart.