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thrombocytes
Erythrocytes and leukocytes are cells, but these cells are cell
fragments, not complete cells.
Erythrocytes (RBCs)
Red, biconcave disks with no nucleus; 7.5 μm in diameter
Erythrocytes (RBCs)
Mainly, transport oxygen and carbon dioxide
neutrophils , basophils, and eosinophils
These types of leukocytes that has a different appearance and function,—contain small granules that differ in color when stained.
Granulocytes, Monocytes and lymphocyte
These leukocytes are agranulocytes— do not contain visible granules
Leukocytes (WBCs)
Spherical cells that must be stained to be seen
Leukocytes (WBCs)
These can move out of blood vessels into the tissues
Leukocytes (WBCs)
They are often in circulation only as a means of getting to the tissues where they perform their functions.
Leukocytes (WBCs)
These functions provide various defenses against foreign pathogens.
Neutrophils
These are the most common type of leukocyte that make up 40% to 70% of all white blood cells in circulation
neutrophils
Each of these has a lobed nucleus and faint granules in the cytoplasm that contain lysozymes used to destroy bacteria
These are the least common type of leukocyte.
These are the least common type of leukocyte that has an average of 0% to less than 2% of all the white blood cells in circulation
neutrophils
The number of these in circulation rises in response to bacterial infections
basophils
The number of these in circulation tends to increase with allergies
histamine and heparin
A basophil’s primary function is to release two chemicals for defense
Histamine
These are released from basophils causes vessels to dilate (expand). This brings
more blood to an area and causes blood vessel walls to become more permeable
Heparin
These are released from basophils is an anticoagulant, which means it prevents
clotting. This chemical allows other leukocytes to move more freely
Eosinophils
These make up 0% to 6% of the total circulating white blood cells.
Eosinophils
Their granules stain orange to bright red, making them easy to distinguish from other WBCs of the total circulating white blood cells.
Eosinophils
The numbers increase with parasitic infections and allergies. The chemicals they secrete can be effective against large parasites such as hookworms and tapeworms.
Monocytes
They make up 4% to 8% of the total circulating white blood cells
Monocytes
They are the largest of the WBCs, measuring two to three times the size of a red blood cell. They have a large, round, kidney-shaped or horseshoe-shaped nucleus surrounded by abundant cytoplasm.
Monocytes
They migrate to tissues where they become macrophages and function to phagocytize (eat) dead and dying tissue, microorganisms, and any other foreign matter or
debris.
Monocytes
The number of these in circulation increases with inflammation and viral infections.
Lymphocytes
They are fairly common in circulating blood, making up 20% to 50% of the total
Lymphocytes
This is important for the immune system that produces antibodies and other chemicals to fight foreign pathogens and is important for tumor control
Thrombocytes
These formed elements are commonly called platelets, that are not actually cells but cell fragments
Platelets
secrete vasoconstrictors (chemicals that reduce the size of broken blood vessels) to slow the flow of blood.
Platelets
They secrete clotting factors to promote the formation of blood clots
Platelets
form platelet plugs and destroy bacteria.
Platelets
They secrete chemicals to attract neutrophils and monocytes to sites of inflammation
Platelets
secrete growth factors to stimulate mitosis to repair vessel walls
