IMMUNOLOGY

Detailed explanation-1: -Lymphocytes help your immune system remember every antigen it comes in contact with. After an encounter, some lymphocytes turn into memory cells. When memory cells run into an antigen again, they recognize it and quickly respond. This is why you don’t get infections like measles or chickenpox more than once.

Detailed explanation-2: -The heat will make the vessels larger and the sudden drop in temperature will make the lymphatic vessels quickly shrink, squeezing the lymphatic fluid and forcing it to flow through the system.