Question

Why is a secondary immune response more intense than the primary immune response in humans?

Answer 1

Hint: First recognizes the first potentially active harmful pathogen and then by activating and mobilizing forces to defend against it. The immune system fights germs and foreign substances in various parts like on the skin, in the tissues of the body, and in bodily fluids such as blood.

Complete answer:
We all know that when our body comes in contact with any foreign particle for the first time, it undergoes the primary or primary immunologic response, it produces B-lymphocytes that manufacture and deploy antibodies to attack the antigen. A number of these lymphocytes become memory cells. These have a way longer lifespan and still exist even after the immune reaction has stopped.
When a secondary response occurs, these memory cells already recognize the antigen and will therefore respond far more quickly.

Additional Information: The body's other defenses against microbes:
As well as the immune system, similarly, the body has several other ways to defend itself against microbes, like the following mentioned below:
-Skin - a water-proof barrier that secretes oil with bacteria-killing properties.
-Lungs - mucous in the lungs (phlegm) traps foreign particles, and small hairs (cilia) wave the mucous upwards so it can be coughed out.
-Digestive tract - the mucous lining contains antibodies, and therefore the acid within the stomach can kill most microbes.
-Other defenses - body fluids like skin oil, saliva, and tears contain antibacterial enzymes that help reduce the chance of infection. The constant flushing of the urinary tract and the bowel also helps.

Note: -White blood cells are the key players in your immune system. They are made in your bone marrow and are part of the lymphatic system.
-Spleen: The spleen is a blood-filtering organ that removes microbes and destroys old or damaged red blood cells from the body(Graveyard of RBC). It also makes disease-fighting components of the immune system including antibodies and lymphocytes.
-Bone marrow: Bone marrow is the spongy tissue, which is found inside bones. It produces the red blood cells our bodies need to carry oxygen, the white blood cells we use to fight infection, and the platelets we need to help our blood clot.
-Thymus: The thymus filters and monitors your blood content. It produces the white blood cells called T-lymphocytes.