Blood

Blood is composed of various cell types and plasma, each serving distinct functions essential for survival. Red blood cells, or erythrocytes, are primarily responsible for oxygen transportation, facilitated by their hemoglobin content and unique double concave shape that enhances surface area.

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Contain heparin, an anticoagulent

Release histamine and other mediators of inflammation

Large purplish-black cytoplasmic granules

Play a complex role in allergy and asthma

Kill parasitic worms

Red cytoplasmic granules

Bilobed nucleus

Phagocytize bacteria

Pale red and blue cytoplasmic granules

Multilobed nucleus

Immunological processes: a) direct cell attack b) antibodies

Thin rim of pale blue cytoplasm

Spherical or indented nucleus

Develop into macrophages (eat cellular debris and microscopic foreign bodies in tissues)

Gray-blue cytoplasm

Kidney-shaped nucleus

increases surface area to volume proportion