Venous system

The venous system is made up of veins and venules (little veins). The veins are the workhorses of the vessel system, carrying oxygen-depleted blood back to the heart. The journey ends with the blood from the head and upper body being returned to the heart via the body’s largest veins, the superior vena cava, and from the lower body via the inferior vena cava, received into the right atrium. The pulmonary veins carry oxygen-rich blood from the lungs back to the heart.

Capillaries are incredibly small and look tiny, like hair. These super-tiny vessels (one cell thick, to be exact) bridge the gap between arterioles and venules to keep blood flowing in a continuous motion.

Answer the questions about the text and translate the text in writing.

1. What are some functions of blood?

2. Do you think blood is a tissue?

3. What sort of cells does blood contain?

4. What are the functions of the three types of blood cells?

5. How can we define blood types?

6. What is the function of the blood vessels?

7. Is there a difference between arteries, veins and capillaries?

8. Why is blood coagulation vital?

9. Which molecule carries oxygen in blood? In which cell is it found?

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