Problem 17 - Objective Biology for NEET

Question

Lymphocyte forms how much per cent of WBCs? (a) 20 to 25 (b) 2 to 3 (c) 6 to 8 (d) 60 to 65

Step-by-Step Solution

Answer

(a) 20 to 25

Step 1: Understanding the question

The question asks about the percentage of WBCs (White Blood Cells) that are made up of lymphocytes. This is a biology question and the answer is a standard fact that can be found in a high school biology textbook. Review the options presented.

Step 2: Finding the answer

Knowing that lymphocytes typically make up 20% to 40% of all white blood cells in the human body, we can look at the answer options and see that the only one that falls within this range is: (a) 20 to 25. Therefore, this is the correct answer.

Key Concepts

Lymphocytes

Lymphocytes are a vital type of white blood cell playing a significant role in our immune system. They are produced in our bone marrow and can be found in the blood and lymphatic tissues. Lymphocytes can be categorized mainly into three types:

• B-cells: Produce antibodies that are used to fight off bacteria and viruses.
• T-cells: Destroy body cells that have been taken over by viruses or have become cancerous.
• Natural Killer cells: Attack and destroy cells that are infected by viruses or have become cancerous.

These cells work together to identify and neutralize invaders, ensuring the body remains healthy. They circulate in the bloodstream and lymphatic system, constantly on the lookout to protect against pathogens, such as bacteria, viruses, and other foreign invaders.

Percentage of WBC Composition

White blood cells (WBCs) are essential components of the blood, involved in defending the body against both infectious disease and foreign materials. They are composed of several different types of cells, each with its unique function. Lymphocytes make up a significant portion of these cells. The percentage of lymphocytes within the white blood cells typically ranges from 20% to 40%. This significant range allows them to be the second most abundant type of white blood cell after neutrophils. Understanding the composition of WBCs is crucial in diagnosing and monitoring various health conditions, as variations in their proportions can indicate underlying medical issues.

Immune System

The immune system is our body's defense mechanism, designed to protect us from foreign threats such as pathogens and viruses. It is a complex network of cells, tissues, and organs, working collectively to maintain health and prevent disease. White blood cells, including lymphocytes, are integral players in this system. Key functions of the immune system include:

• Identifying and neutralizing harmful invaders like viruses and bacteria.
• Removing cells that are infected or damaged.
• Distinguishing between the body’s own cells and foreign cells.

A healthy immune system adapts to new threats, providing protection without attacking the body's own cells. Proper function of the lymphocytes in recognizing and eliminating invaders is fundamental for the immune system to function correctly. Disruptions in any part of this system can lead to health problems such as autoimmune diseases or increased susceptibility to infections.