vascular tissue without RBC
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Vascular tissue (blood and lymph)
Blood and lymph represent the final form of connective tissue we will study. In the high magnification image, notice that blood consists of erythrocytes (red blood cells), leukocytes (white blood cells), and platelets. Blood is contained in blood vessels (arteries, veins, capillaries). Lymph (not shown here) is composed of leukocytes flowing in lymphatic vessels. The matrix of this form of connective tissue is a liquid known as plasma. Examine the prepared slides of human blood to the right. The enucleate red blood cells are the most numerous element. The red blood cells usually make up 40-55% of the volume of the blood, but the percentage varies with sex and many other factors. There are many fewer white blood cells or leucocytes (these are labeled a, b, and c). These cells are the primary combatants in the fight against bacterial and viral infections. As such, alterations in the number or kinds of these cells present in the blood can be indicative of infection and is often used as a diagnostic tool. We will come back to study the types of white blood cells later in the semester when we consider the immune system. The platelets are involved in blood clotting; their role will also be studied in more detail later in the semester.
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phloem and Xylem as well as leaves stem and roots