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Magazine Chapter 13: Problem 1
Match the following cells with their definitions as given below. basophil eosinophil erythrocyte hematopoietic stem cell lymphocyte monocyte neutrophil platelet Mononuclear white blood cell (agranulocyte) formed in lymph tissue; it is a phagocyte and the precursor of a macrophage ______________________
Short Answer
Expert verified
The cell type that matches the definition is 'monocyte.'
Step by step solution
01
Understand the Key Terms
Start by understanding each cell type in the list. Note that:
- **Basophil, eosinophil, neutrophil** are different types of granulocytes, a type of white blood cell, each with distinct functions related to immune responses.
- **Erythrocyte** is another term for red blood cell, primarily responsible for oxygen transport.
- **Hematopoietic stem cell** is a type of stem cell that gives rise to other blood cells.
- **Lymphocyte** is a type of mononuclear white blood cell involved in immune response.
- **Monocyte** is a type of mononuclear white blood cell that becomes a macrophage.
- **Platelet** is essential for blood clotting.
02
Identify Key Definition Attributes
Carefully read the definition provided in the problem. A mononuclear white blood cell that is an agranulocyte, formed in lymph tissue, acts as a phagocyte, and is a precursor of a macrophage describes a specific cell type.
03
Analyze the Definition
Focus on keywords:
- **Mononuclear white blood cell:** This excludes erythrocytes, platelets, and granulocytes (basophils, eosinophils, neutrophils).
- **Agranulocyte:** Eliminates any granulocyte options (basophils, eosinophils, neutrophils).
- **Phagocyte:** Both monocytes and some lymphocytes have phagocytic abilities, but monocytes are well-known.
- **Precursor of a macrophage:** This is a specific attribute of a monocyte.
04
Match Definition to Cell Type
Using the analysis from previous steps, match the definition to 'monocyte.' Monocytes are mononuclear agranulocytes formed in lymph tissue, act as phagocytes, and differentiate into macrophages once in tissue.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Hematopoietic Stem Cells
Hematopoietic stem cells are incredibly important because they are the origin of all blood cells. These special cells exist primarily in the bone marrow, which is a spongy tissue found inside bones. From here, they differentiate into two primary cell lineages: myeloid and lymphoid cells.
- Myeloid cells give rise to red blood cells, platelets, and some types of white blood cells, including granulocytes and monocytes.
- Lymphoid cells mature into lymphocytes, which are crucial for the immune response.
Immune System
The immune system is our body鈥檚 defense against invading pathogens like bacteria and viruses. It is made up of various cells and proteins that work together to protect us from infection. White blood cells (WBCs) are vital parts of this system.
- Lymphocytes: These cells include T cells and B cells, which are responsible for recognizing specific pathogens and remembering them for faster response in future attacks.
- Phagocytes: These are cells that engulf and destroy foreign substances, and they include monocytes and neutrophils.
White Blood Cells
White blood cells (WBCs), also known as leukocytes, play a crucial role in defending the body against infections. Unlike red blood cells, they are not involved in carrying oxygen but are responsible for identifying and eliminating pathogens.
There are different types of WBCs, including:
There are different types of WBCs, including:
- Granulocytes: Such as neutrophils, eosinophils, and basophils. These cells contain granules and have roles in fighting parasites, allergens, and infections.
- Agranulocytes: Include monocytes and lymphocytes, which lack granules and are important in adaptive immunity and phagocytosis.
Red Blood Cells
Red blood cells, or erythrocytes, are the most common type of blood cells. Their main function is to transport oxygen from the lungs to the rest of the body and return carbon dioxide back to the lungs for exhalation.
These cells are unique because:
These cells are unique because:
- They have a biconcave shape, which increases their surface area for better gas exchange.
- They contain hemoglobin, a protein that binds oxygen, giving the cells their red color.
Blood Clotting
Blood clotting, also known as coagulation, is a crucial process that prevents excessive bleeding when a blood vessel is injured. Platelets, tiny cell fragments in the blood, play a significant role in this process.
When a blood vessel is damaged:
When a blood vessel is damaged:
- Platelets gather at the site to form a temporary plug.
- They release chemicals that activate a series of events that lead to the formation of fibrin strands, creating a stable clot.
