blood cell review — mr. fletcher
answer each question in 1–2 sentences. be clear and complete.
1. describe the shape of red blood cells and whether they have nuclei.
2. explain what anemia is and how it affects the body.
3. name one cause of anemia related to red blood cell quantity and describe it.
4. identify the oxygen - carrying protein whose deficiency can cause anemia and explain its role.
5. explain what pernicious anemia is and which vitamin deficiency causes it.
6. what is a hematocrit test and what does it separate?
7. define the buffy coat and state which components of blood it contains.
8. what is the normal approximate percentage for red blood cells (hematocrit) in blood?
9. define polycythemia and explain how it differs from a normal rbc level.
10. name two types of white blood cells that perform phagocytosis and briefly describe phagocytosis.

Question

Accepted Answer

### Question 1
# Brief Explanations:
Red blood cells (erythrocytes) are biconcave disc - shaped, which increases their surface area for gas exchange, and they do not have a nucleus in mature human red blood cells.
# Answer:
Red blood cells are biconcave discs and mature red blood cells do not have a nucleus.

### Question 2
# Brief Explanations:
Anemia is a condition where the blood has a reduced ability to carry oxygen, either due to fewer red blood cells, less hemoglobin, or abnormal hemoglobin. It affects the body by causing fatigue, weakness, shortness of breath, and pale skin as tissues receive less oxygen.
# Answer:
Anemia is a condition with reduced oxygen - carrying capacity of blood (due to low RBC, abnormal or low hemoglobin), causing fatigue, weakness, and other symptoms from insufficient oxygen delivery to tissues.

### Question 3
# Brief Explanations:
One cause of anemia related to red blood cell quantity is blood loss (acute or chronic). Acute blood loss (e.g., from a severe injury) or chronic blood loss (e.g., from a bleeding ulcer or heavy menstrual bleeding) reduces the number of red blood cells in the body, leading to anemia as there are fewer cells to carry oxygen.
# Answer:
A cause is blood loss (e.g., from injury or ulcer). It reduces RBC count, lowering blood's oxygen - carrying capacity and causing anemia.

### Question 4
# Brief Explanations:
The oxygen - carrying protein whose deficiency can cause anemia is hemoglobin. Hemoglobin is located in red blood cells and its role is to bind to oxygen in the lungs and transport it to the body's tissues, and also to bind to carbon dioxide in tissues and transport it to the lungs for exhalation. A deficiency in hemoglobin means less oxygen can be carried, leading to anemia.
# Answer:
The protein is hemoglobin. It binds to oxygen in the lungs and transports it to tissues (and carries CO₂ back), and its deficiency causes anemia.

### Question 5
# Brief Explanations:
Pernicious anemia is a type of megaloblastic anemia caused by a deficiency of vitamin B₁₂. The deficiency occurs because the body lacks intrinsic factor (a protein needed for vitamin B₁₂ absorption), leading to impaired red blood cell production as vitamin B₁₂ is essential for DNA synthesis in red blood cell precursors.
# Answer:
Pernicious anemia is a megaloblastic anemia caused by vitamin B₁₂ deficiency (due to lack of intrinsic factor for B₁₂ absorption), impairing RBC production.

### Question 6
# Brief Explanations:
A hematocrit test is a blood test that measures the proportion of red blood cells in the total blood volume. It separates the blood into three components: red blood cells (the bottom layer), plasma (the top liquid layer), and the buffy coat (a thin middle layer containing white blood cells and platelets).
# Answer:
A hematocrit test measures RBC proportion in blood. It separates blood into RBCs (bottom), plasma (top), and buffy coat (middle, with WBCs and platelets).

### Question 7
# Brief Explanations:
The buffy coat is the thin, light - colored layer that forms between the red blood cells and the plasma when blood is centrifuged. It contains white blood cells (leukocytes) and platelets (thrombocytes).
# Answer:
The buffy coat is the thin layer between RBCs and plasma (after centrifugation). It contains white blood cells and platelets.

### Question 8
# Brief Explanations:
The normal approximate percentage for red blood cells (hematocrit) in blood is about 45% (range: 40 - 50%) for adult males and about 40% (range: 35 - 45%) for adult females.
# Answer:
For adult males, ~45% (40 - 50%); for adult females, ~40% (35 - 45%).

### Question 9
# Brief Explanations:
Polycythemia is a condition where there is an abnormally high number of red blood cells in the blood. In a normal RBC level, the number of red blood cells is within the reference range (e.g., 4.5 - 5.5 million cells/μL for males, 4.0 - 5.0 million cells/μL for females), while in polycythemia, the RBC count is above this normal range, which can increase blood viscosity and strain the cardiovascular system.
# Answer:
Polycythemia is high RBC count. Normal RBC levels are within a range (e.g., 4.5 - 5.5M/μL for males, 4.0 - 5.0M/μL for females), while polycythemia has RBC count above normal, increasing blood viscosity.

### Question 10
# Brief Explanations:
Two types of white blood cells that perform phagocytosis are neutrophils and macrophages. Phagocytosis is the process by which these cells engulf and digest foreign particles (like bacteria), dead cells, or other debris. Neutrophils are the first responders to infection, while macrophages are larger and can also present antigens to other immune cells.
# Answer:
Two types are neutrophils and macrophages. Phagocytosis is the engulfing and digestion of foreign particles, dead cells, or debris.

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