Blood

Blood

Grade 7

Multiple Choice

It carries blood away from the heart.

• Arteries

• Veins

• Capillaries

Multiple Choice

Connect the arteries to the veins. They carry blood close to every tissue in the body.

• Veins

• Capillaries

• Arteries

Multiple Choice

Carry blood back to the heart

• Arteries

• Veins

• Capillaries

Components of the Blood

• Plasma- About 55% of our blood. It is the liquid part of blood. It is mostly water.

• Red blood cells- They are red because of the hemoglobin.

• White blood cells- larger than red blood cells, and they have a nucleus. WBC help to defend against bacteria and viruses that get into the body.

• Platelets - little fragments of cells. If a blood vessel gets damaged, the platelets help the blood to clot and seal the wound.

• Describe which two ways in which white blood blood cells look different from red blood cells.