Question

heart, blood & vessels
name:
class:
capillaries
heart
hemoglobin
arteries
circulatory
white
platelets
veins
a. complete the sentences:

1. the ______ system transports blood, nutrients, and gases throughout the body.
2. the muscular organ that pumps blood is the ______.
3. ______ carry blood away from the heart.
4. ______ carry blood back to the heart.
5. tiny vessels where gas exchange happens are called ______.
6. red blood cells contain ______, which carries oxygen.
7. ______ blood cells help fight infection and disease.
8. ______ are cell fragments that help blood clot.

b. answer the following questions:

1. explain the difference between arteries and veins.

1. what is the function of capillaries?

Explanation:

For part A, we use knowledge of the circulatory system:

1. The circulatory system transports blood, nutrients, and gases.
2. The heart is the muscular organ that pumps blood.
3. Arteries carry blood away from the heart.
4. Veins carry blood back to the heart.
5. Capillaries are tiny vessels for gas exchange.
6. Red blood cells have hemoglobin to carry oxygen.
7. White blood cells fight infection.
8. Platelets are cell fragments for clotting.

For part B:

1. Arteries carry oxygen - rich blood (except pulmonary artery) away from the heart, have thick, elastic walls. Veins carry oxygen - poor blood (except pulmonary vein) back to the heart, have thinner walls and valves to prevent backflow.
2. Capillaries allow for the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and body cells.

Answer:

Part A

1. circulatory
2. heart
3. Arteries
4. Veins
5. capillaries
6. hemoglobin
7. White
8. Platelets

Part B

1. Arteries carry blood (usually oxygen - rich, except pulmonary artery) away from the heart. They have thick, elastic walls to withstand high blood pressure. Veins carry blood (usually oxygen - poor, except pulmonary vein) back to the heart. They have thinner walls and contain valves to prevent the backflow of blood.
2. Capillaries are the site of exchange between blood and body cells. Oxygen and nutrients from the blood diffuse into the cells, while carbon dioxide and waste products from the cells diffuse into the blood.