Tunica Media Of Muscular Artery

Figure 1-63

Lymphocyte Common (25%). Characterized by single-lobed, "dented" nucleus surrounded by clear cytoplasm. May be large or small. Heavily involved in the immune response including synthesis of antibodies. (X640)

Nucleus

Figure 1-63

Lymphocyte Common (25%). Characterized by single-lobed, "dented" nucleus surrounded by clear cytoplasm. May be large or small. Heavily involved in the immune response including synthesis of antibodies. (X640)

Nucleus

Kidney Shape Nucleus

Figure 1-64

Monocyte Relatively rare (3%). Lobed, often kidney-shaped nucleus is surrounded by clear cytoplasm. Largest of the leukocytes, this cell is a precursor to a macrophage, which engages in phagocytosis. (X640)

Figure 1-64

Monocyte Relatively rare (3%). Lobed, often kidney-shaped nucleus is surrounded by clear cytoplasm. Largest of the leukocytes, this cell is a precursor to a macrophage, which engages in phagocytosis. (X640)

Macrophages Kidney Shaped

Histology

Blood Cells Histology

Figure 1-65

Erythrocytes (Red Blood Cells) and Platelets

Circulating erythrocytes are far more common than any of the leukocytes. Normally they have no nucleus but contain the red pigment hemoglobin, which permits them to transport oxygen and carbon dioxide throughout the body. Typically they assume the shape of a biconcave disk. Their diameter of about 7 microns is useful for comparing sizes of other histological structures. Platelets are cellular remnants of a much larger precursor. These remnants contain numerous chemicals, including those important for clotting and inflammation. Platelets initiate blood clotting by forming a plug at wound sites. (X500)

Platelets Erythrocytes

Figure 1-66

Sickle Cell Anemia Genetic alteration of hemoglobin results in altered membrane structure and abnormal wavy or elongated, curved shape that often resembles a sickle (upper left). Oxygen-carrying capacity is much reduced. (X500)

Tunica Media Arteries

Figure 1-67

Artery (A) and Vein (V) Blood vessels possess a tunica intima that lines the lumen, outside of which is a muscular tunica media, and a connective tissue covering, the tunica adventitia. The tunica media of arteries is typically much thicker than that of veins. (X100)

Tunica adventitia Tunica media Tunica intima

Figure 1-67

Artery (A) and Vein (V) Blood vessels possess a tunica intima that lines the lumen, outside of which is a muscular tunica media, and a connective tissue covering, the tunica adventitia. The tunica media of arteries is typically much thicker than that of veins. (X100)

Tunica adventitia Tunica media Tunica intima

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