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2. Continue the following sentences.

1) The circulatory system is composed of... .

2) The systemic circulation sends blood from the heart to ... .

3) The main function of the heart is ... .

4) The heart lies ....

5) Arteries carry blood away from ....

6) Veins contain valves that prevent blood from ....

7) The capillaries are one of the most important parts of the circulatory system because ....

3. Match the anatomical terms and their definitions.

1. Period of relaxation and expansion of the heart when its chambers fill with blood. 2.Valves located between the atria and ventricles. 3. Minute blood vessel that connects arterioles with venules. 4. Series of events that occur in the heart during one complete heartbeat. 5. Small artery. 6. Thin membrane lining the interior of the heart. 7. Lubricating outer layer of the heart wall and part of the pericardium. 8. Cardiac muscle layer of the heart wall. 9. Tough, fibrous, two-layered membrane sac that surrounds, protects, and anchors the heart. 10. System of blood vessels that transports blood between the heart and lungs. 11. System of blood vessels that transports blood between the heart and all parts of the body other than the lungs. 12. Rhythmic contraction of the heart. 13. Either of two large veins that return blood to the right atrium of the heart. 14. Small vein.

a) cardiac cycle; b) myocardium; c) systemic circulation; d) venule; e) arteriole; J) diastole; g) pericardium; h) vena cava; i) capillary; j) systole; k) atrioventricular valves; I) endocardium; m) pulmonar circulation; n) epicardium

4. Select the appropriate word from the list provided.

The _____travel through the ________________suspended in a yellowish fluid called. Plasma is 90 % water and contains nutrients, proteins, hormones, and waste products. Whole blood is a _________of blood cells and plasma.

___________________(also called erythrocytes) are shaped like slightly indented, flattened disks. RBCs contain the iron-rich protein hemoglobin. Blood gets its bright red color when hemoglobin picks up oxygen in the lungs. As the blood travels through the body, the _______________ releases oxygen to the tissues. The body contains more RBCs than any other type of cells, and neach has a life span of about 4 months. Each day, the body produces new red blood cells to replace those that die or are lost from the body. __________________(also called leukocytes) are a key part of the body's system for defending itself against infection. They can move in and out of the _______________to reach affected tissues. The blood contains far fewer WBCs than red cells, although the body can increase production of WBCs to fight infection. There are several types of WBCs, and their life spans vary from a few days to months. New cells are constantly being formed in the bone marrow.

  • Red blood cells

  • White blood cells

  • mixture

  • cells

  • bloodstream

  • circulatory system

  • plasma

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