Where is the actual exchange of oxygen and carbon dioxide take place?*         a. Veins       b. Artery       c. Capillaries 2. What type of blood vessels that contain valves to ensure blood flows in only one direction?*         a. Veins       b. Capillaries       c. Artery   What type of blood vessel that carry oxygenated blood away from the heart and also contain a strong, muscular middle layer that helps pump blood through the body?         a. Capillaries       b. Veins       c. Artery

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Hematology

Hematology is the branch of biology. Hematology is the medical field that deals with the treatment of blood disorders and cancers, such as hemophilia, leukemia, lymphoma, and sickle-cell anemia. Hematologists and hematopathologists are medical professionals who specialize in illnesses of the blood and its components.