The document defines key terms related to the blood, lymphatic, and immune systems including antibodies, allergies, and vaccination. Antibodies are Y-shaped proteins produced by the immune system to detect and combat antigens like bacteria, fungi, and viruses. Allergies occur when the immune system has an unusual reaction to an allergen through itchy eyes, sneezing, or skin reactions. Vaccines work by exposing the body to weakened forms of viruses and bacteria to produce antibodies to prevent future infections from the live versions of these pathogens.

1. CHAPTER 6 TERMS
Blood and the Lymphatic and immune systems

2. ANTIBODIES
 An antibody is a protein that is produced by the
body's immune system.
 Created when the body detects a harmful
substance, called an antigen.
 Examples: bacteria, fungi, parasites, and viruses.
 The molecule itself is roughly shaped like a "Y"

3. ANTIBODIES (CONT’D)

4. ALLERGY
 An unusual reaction of the body to a previously
encountered allergen usually by inhalation,
ingestion, injection, or skin contact, often
manifested by itchy eyes, runny nose, wheezing,
skin rash, or diarrhea.
 This is a reaction between an antibody and an
antigen and sets off a series of chemical reactions
designed to protect the body from infection.
 It is estimated that 60 million Americans, or more
than one in every five people, suffer from some
form of allergy

5. ALLERGY (CONT’D)

6. VACCINATION
 The use of vaccines to prevent certain diseases.
 Vaccines are medicines that have weakened or
dead bacteria or viruses.
 When someone takes a vaccine, their immune
system responds by producing antibodies
 When the person is later exposed to live bacteria or
viruses of the same kind that were in the vaccine,
the antibodies prevent those organisms from
making the person sick.

7. VACCINATION (CONT’D)