The Blood Histology Questions

The leukocytes consist of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph. Lymphocytes are agranulocytes. Lymphocytes can be categorized by three sizes: small, medium, and large. The small lymphocytes are the smallest leukocyte, being only slightly larger than an erythrocyte. Monocytes are agranulocytes. They are the largest leukocyte. Eosinophils are granulocytes. Eosinophils have prominent orange pink granules. The nucleus of eosinophils is usually bi-lobed.
Basophils are granulocytes. Basophils have large blue granules, which often obscure the nucleus. The granules are basophilic, therefore they are blue.

There are four basic tissue types: epithelium, connective tissue, muscle and nervous tissue. Connective tissue is the most diverse. Blood is considered a type of connective tissue.

Blood is composed of the formed elements and plasma. Plasma is the liquid portion of blood. The formed elements consist of the cells and cell fragments. The erythrocytes (red blood cells), platelets, and leukocytes (white blood cells) are all considered formed elements.

Erythrocytes (red blood cells) are the most abundant formed element in a peripheral smear of blood.

The granulocytes are named because of the presence of visible cytoplasmic granules. The granulocytes consist of neutrophils, eosinophils, and basophils. The non- granulocytes are lymphocytes and monocytes. Erythrocytes are red blood cells. A thrombocyte is a platelet.

Erythrocytes (red blood cells) are described as biconcave discs. When stained, this phenomenon results in the central portion of the cell staining lighter, thus the "central pallor".

A thrombocyte is another name for a platelet.

The leukocytes consist of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph. Lymphocytes are agranulocytes. Lymphocytes can be categorized by three sizes: small, medium, and large. The small lymphocytes are the smallest leukocyte, being only slightly larger than an erythrocyte. Monocytes are agranulocytes. They are the largest leukocyte. Eosinophils are granulocytes. Eosinophils have prominent orange pink granules. The nucleus of eosinophils is usually bi-lobed.
Basophils are granulocytes. Basophils have large blue granules, which often obscure the nucleus. The granules are basophilic, therefore they are blue.

The granulocytes are named because of the presence of visible cytoplasmic granules. The granulocytes consist of neutrophils, eosinophils, and basophils. "PMN" is an abbreviation for polymorphonuclear neutrophil. Thus, it is a neutrophil, which is a granulocyte. The non-granulocytes are lymphocytes and monocytes.

The granulocytes are named because of the presence of visible cytoplasmic granules. The granulocytes consist of neutrophils, eosinophils, and basophils. The non- granulocytes are lymphocytes and monocytes. Erythrocytes are red blood cells. A thrombocyte is a platelet.

The leukocytes consist of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph". Lymphocytes are agranulocytes. Lymphocytes can be categorized by three sizes: small, medium, and large. The small lymphocytes are the smallest leukocyte, being only slightly larger than an erythrocyte. Monocytes are agranulocytes. They are the largest leukocyte. Eosinophils are granulocytes. Eosinophils have prominent orange pink granules. The nucleus of eosinophils is usually bi-lobed.
Basophils are granulocytes. Basophils have large blue granules, which often obscure the nucleus. The granules are basophilic, therefore they are blue.

The leukocytes consist of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph". Lymphocytes are agranulocytes. Lymphocytes can be categorized by three sizes: small, medium, and large. The small lymphocytes are the smallest leukocyte, being only slightly larger than an erythrocyte. Monocytes are agranulocytes. They are the largest leukocyte. Eosinophils are granulocytes. Eosinophils have prominent orange pink granules. The nucleus of eosinophils is usually bi-lobed.
Basophils are granulocytes. Basophils have large blue granules, which often obscure the nucleus. The granules are basophilic, therefore they are blue.

Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph".

Lymphocytes are the second most abundant leukocyte. Leukocytes are the white blood cells. The order of frequency of the leukocytes is: neutrophil, lymphocyte, monocyte, eosinophil, basophil.

Basophils are the least abundant leukocyte. Leukocytes are the white blood cells. The order of frequency of the leukocytes is: neutrophil, lymphocyte, monocyte, eosinophil, basophil.

Erythrocytes (red blood cells) are described as biconcave discs. When stained, this phenomenon results in the central portion of the cell staining lighter, thus the "central pallor".

Blood is composed of the formed elements and plasma. Plasma is the liquid portion of blood. The formed elements consist of the cells and cell fragments. The erythrocytes (red blood cells), platelets, and leukocytes (white blood cells) are all considered formed elements. Erythrocytes do not contain a nucleus. During their development within the bone marrow, they have a nucleus. However, prior to their entering into the blood stream, the nucleus is ejected. Platelets are cell fragments. Platelets also do not contain a nucleus. They are fragments from megakaryocytes within the bone marrow. Leukocytes, which include monocytes, are cells with a nucleus.

The granulocytes are named because of the presence of visible cytoplasmic granules. The granulocytes consist of neutrophils, eosinophils, and basophils. The non- granulocytes are lymphocytes and monocytes. Erythrocytes are red blood cells. A thrombocyte is a platelet.

The granulocytes are named because of the presence of visible cytoplasmic granules. The granulocytes consist of neutrophils, eosinophils, and basophils. "PMN" is an abbreviation for polymorphonuclear neutrophil. Thus, it is a neutrophil, which is a granulocyte. The non-granulocytes are lymphocytes and monocytes.

The leukocytes consist of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Neutrophils are granulocytes. Neutrophils have a multi-lobed nucleus. The lobes are separated by a thin strand. Because of the shape of the nucleus, neutrophils are also called "polymorphonuclear neutrophils", "poly's", "PMN", or "polymorph". Lymphocytes are agranulocytes. Lymphocytes can be categorized by three sizes: small, medium, and large. The small lymphocytes are the smallest leukocyte, being only slightly larger than an erythrocyte.Monocytes are agranulocytes. They are the largest leukocyte. Eosinophils are granulocytes. Eosinophils have prominent orange pink granules. The nucleus of eosinophils is usually bi-lobed.
Basophils are granulocytes. Basophils have large blue granules, which often obscure the nucleus. The granules are basophilic, therefore they are blue.

Platelets are cell fragments. They are fragments from megakaryocytes within the bone marrow. Histology hint: The prefix "mega" is from the Greek "megas" which means great or big. For example: megaphone, megalomaniac, megabyte, and megakaryocyte.

Blood is composed of the formed elements and plasma. Plasma is the liquid portion of blood. The formed elements consist of the cells and cell fragments. The erythrocytes (red blood cells), platelets, and leukocytes (white blood cells) are all considered formed elements. When a sample of blood is centrifuged, the percentage occupied by the formed elements is the hematocrit. An average hematocrit is about 45%.

An erythrocyte is another name for a red blood cell.

The buffy coat is seen in a sample of centrifuged blood. It is the thin layer above the red blood cells, but below the plasma. It consists of the leukocytes and platelets.

Neutrophils are the most abundant leukocyte. Leukocytes are the white blood cells. The order of frequency of the leukocytes is: neutrophil, lymphocyte, monocyte, eosinophil, basophil.