Which of the following blood cells releases granules that intensify the inflammatory response and promote hypersensitivity (allergic) reactions?

The blood cells that release granules intensifying the inflammatory response and promoting hypersensitivity (allergic) reactions are called Mast cells.

Here's a step-by-step explanation:

1. The human body has various types of blood cells, each with a specific function. These include red blood cells, white blood cells, and platelets.

2. White blood cells, also known as leukocytes, play a crucial role in the immune system. They are responsible for fighting off infections and diseases. There are several types of white blood cells, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils.

3. Among these, mast cells are a type of white blood cell that plays a key role in the body's immune response. They are part of the body's first line of defense against pathogens.

4. Mast cells contain granules filled with potent chemicals, including histamine and heparin. When the body encounters a threat, such as an allergen, the mast cells release these granules into the surrounding tissues.

5. The release of these granules triggers an inflammatory response, which includes symptoms like redness, swelling, and heat. This is part of the body's attempt to isolate and eliminate the threat.

6. In addition to triggering an inflammatory response, the chemicals released by mast cells also promote hypersensitivity reactions. This is why people with allergies often experience symptoms like itching, hives, and sneezing. These are all signs of an overactive immune response triggered by the release of granules from mast cells.

So, in conclusion, mast cells are the blood cells that release granules intensifying the inflammatory response and promoting hypersensitivity (allergic) reactions.