This blockage causes unstable angina or heart attack (myocardial infarction), depending on the location and amount. read more ), blood can become too thick, which may cause the blood to clot more easily and increase the risk of heart attacks Acute Coronary Syndromes (Heart Attack Myocardial Infarction Unstable Angina) Acute coronary syndromes result from a sudden blockage in a coronary artery. When the number of red blood cells is too high (erythrocytosis, as in polycythemia vera Polycythemia Vera Polycythemia vera is a myeloproliferative neoplasm of the blood-producing cells of the bone marrow that results in overproduction of all types of blood cells. read more ), blood carries less oxygen, and fatigue and weakness develop. Red blood cells contain hemoglobin, a protein that enables them to carry oxygen from the lungs and deliver it to all parts. When the number of red blood cells is too low ( anemia Overview of Anemia Anemia is a condition in which the number of red blood cells is low. Red blood cells carry carbon dioxide away from the tissues and back to the lungs. Oxygen is used by cells to produce energy that the body needs, leaving carbon dioxide as a waste product. Red blood cells contain hemoglobin, a protein that gives blood its red color and enables it to carry oxygen from the lungs and deliver it to all body tissues. Red blood cells (also called erythrocytes) make up about 40% of the blood's volume. Too little clotting can cause excessive bleeding from minor injury Too. Hemostasis includes clotting of the blood. read more (immunoglobulins), which actively defend the body against viruses, bacteria, fungi, and cancer cells, and clotting factors How Blood Clots Hemostasis is the body's way of stopping injured blood vessels from bleeding.

Other proteins in plasma include antibodies Antibodies One of the body's lines of defense (immune system) involves white blood cells (leukocytes) that travel through the bloodstream and into tissues, searching for and attacking microorganisms and.

Albumin helps keep fluid from leaking out of blood vessels and into tissues, and albumin binds to and carries substances such as hormones and certain drugs. It constitutes more than half of the blood's volume and consists mostly of water that contains dissolved salts (electrolytes) and proteins.

Plasma is the liquid component of blood, in which the red blood cells, white blood cells, and platelets are suspended.

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