Anatomy of RBCs

megaloblastic anemia

Vitamin B12 and folic acid deficiency

What is the primary function of erythrocytes?

To supply O2 to tissues via hemoglobin and remove CO2 from tissues.

What is the composition of plasma?

91-92% water and 8-9% solids, including proteins like albumin, globulin, and fibrinogen.

What is the role of albumin in plasma?

Maintains oncotic pressure and serves as a source of amino acids.

How does hemoglobin carry oxygen?

O2 reacts with Fe2+ in the hem to form oxyhemoglobin, with each molecule able to carry 4 O2 molecules.

What is the significance of the biconcave shape of erythrocytes?

It increases surface area for O2-hemoglobin-CO2 transfer.

What are the differences in erythrocyte characteristics among species?

Differences include cell number, size, and lifespan.

What factors influence the affinity of hemoglobin for oxygen?

pH, temperature, and CO2 concentration.

What happens to hemoglobin in the presence of carbon monoxide?

Hemoglobin preferentially reacts with CO to form carbonmonoxyhemoglobin, which inhibits O2 binding.

What is the role of megakaryocytes in blood?

They are responsible for the production of platelets.

What is the function of globulin in plasma?

Involved in immune function and formed by immune cells and the liver.

What is the role of the spleen in relation to erythrocytes?

It helps in the removal of aged erythrocytes from the bloodstream.

What are reticulocytes?

Immature red blood cells that develop from erythrocyte precursors.

What is methaemoglobin and how is it formed?

It is formed when Fe2+ in hemoglobin is oxidized to Fe3+, preventing O2 binding.

What is the normal hemoglobin content in most mammals?

Approximately 13-15 g/dl.

What are the key nutrients required for erythrocyte production?

Iron: hemoglobin production

Vitamin B12: maturation of erythrocytes and formation of DNA

Folic acid: DNA and RNA synthesis

What is the primary function of erythropoietin (EPO)?

To stimulate RBC production in the bone marrow in response to decreased oxygen delivery.

What is the typical erythrocyte count in healthy adult males?

5-6 million per microliter of blood.

What are the two main types of hemolysis that remove aged erythrocytes from circulation?

Intravascular hemolysis and extravascular hemolysis.

What is the role of haptoglobin in erythrocyte destruction?

It binds to hemoglobin released from lysed erythrocytes for recycling.

What causes hemorrhagic anemia?

Acute blood loss due to External/internal bleeding from trauma or surgery. Coagulation disorders like warfarin or sweet clover. Parasites like hookworm or coccidia.

Chronic blood loss due to GI lesions. Coaggulation disorders like vitamin k deficiency and hemophilia. Parasites like ticks, lice and hookworms.

What is hypoproliferative anemia?

Anemia caused by decreased erythropoiesis due to dietary deficiencies, bone marrow destruction, and bracken poisoning

What is the primary cause of hemolytic anemia?

Destruction of erythrocytes due to blood parasites,, bacterial infections, chemicals/drugs,poison, and immune mediation

What dietary components are essential for erythropoiesis?

Amino acids, lipids, carbohydrates, iron, folic acid, and vitamin B12.

What is the significance of ferritin in the body?

It stores iron for hemoglobin production.

What is the typical erythrocyte count in healthy adult females?

4-5 million per microliter of blood.

How does erythropoiesis respond to low oxygen levels?

EPO production increases, stimulating RBC production in the bone marrow.

What is the average lifespan of erythrocytes in cattle?

125-150 days.

What is the average lifespan of erythrocytes in cats?

70-80 days.

What is the average lifespan of erythrocytes in horses?

140-150 days for draft/cold-blooded and 120 days for light/hot-blooded.

What is the role of vitamin B12 in erythropoiesis?

It is essential for the maturation of erythrocytes and DNA formation.

extravascular hemolysis removes erythrocytes from circulation by...

cellular fragments and aging erythrocytes are engulfed by cells in the macrophage system

What are the clinical measures used to assess erythrocytes?

Red cell indices including MCV, MCH, and MCHC.

hypochromic anemia

iron deficiency

Albumin

Source of amino acids and maintains osmotic pressure. Formed in the liver.

Fibrinogen

For blood clotting. Formed in the liver

What is the process of erythropoiesis?

The development of erythrocytes from pluripotent stem cells in the bone marrow.

What are the main components of blood?

Plasma, erythrocytes (red cells), and leucocytes (white cells).

What is the lifespan of erythrocytes in humans?

100-120 days.

Where is blood cell production located in adults?

Primarily in the bone marrow.

What is the difference between fetal and adult hemoglobin?

Fetal hemoglobin has a higher affinity for O2 than adult hemoglobin.

What is the primary site of blood cell production in a fetus?

The bone marrow.

What are the main functions of blood?

Transport, regulation, and defense.

What is the role of the liver in blood plasma?

It produces key proteins such as albumin, globulin, and fibrinogen.

What are erythrocytes?

Red blood cells responsible for transporting oxygen in the blood.

What is the average lifespan of erythrocytes in humans?

100-120 days.

What is the diameter of erythrocytes in dogs?

7 micrometers.

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