Understanding Reticulocytes And The Immune System

Understanding Reticulocytes And The Immune System

Question 1. Reticulocyte.
Answer:

Reticulocyte Synonym:

• Immature RBC.
• Size: 7-8 mm

Reticulocyte Structure:

• Nucleus is not present
• It contains remnants of RNA.
• Cytoplasm contains reticular network of disintegrated organelles.
• It is basophilic due to the presence of remnants of golgi apparatus, mitochondria and other organelles.

Reticulocyte Count:

• 2-6% in newobron.
• Decreases after first week.
• Remains constant at or below 1% – later.
• Increases when RBC production increases.

Question 2. Types of immunity.
Answer:

1. Innate immunity:

• It is inborn capacity of body to resist against diseases caused by pathogens.
• It is present at birth.
• Whenever any pathogens enters the body, it eliminates them before they cause any disease.

2. Acquired immunity:

• It is the resistance development by the body against any specific foreign body.
• It is also called specific immunity.
• Lymphocyte plays an important role in it.
• This is again of two types.
  1. Cellular immunity:
     • It is responsible for delayed allergic reaction and rejection of transplants.
     • It is mediated by T-lymphocytes.
     • It is the major defence against infections caused by fungi, virus and bacteria.
     • It also helps in defense against tumours.
  2. Humoral immunity:
     • It is mediated by B-lymphocytes.
     • It activates the complement system to neutralize antigens.
     • It is major defense against bacterial infection

Question 3. Lymphocytes.
Answer: