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As soon as an invader, known as a(n) _____, enters the body, the body begins to fight.

A. antibody

B. pathogen

C. trigger

D. vaccination

Answer Explanation:

Pathogen is an infectious foreign body that enters the body and causes disease or illness to the person. There are five types of pathogens: viruses, bacteria, fungi, protozoa, and worms. Pathogens have antigen proteins found on their surface and are unique to each pathogen.

Antibody is a protein produced by the body’s immune system when it detects harmful substances (antigens). There are many different antibodies found in the body. Each one is unique and protects the body against the specific antigen that it detects at any given time. If there are no antibodies for a specific antigen, the more likely you are to develop an illness.

Vaccinations are the introduction of a dead or disabled pathogen or of a harmless microbe with the protein of a pathogen on its surface into the body. Often administered through needle injection, to stimulate the immune system to produce immunity to a specific disease Immunity protects the body from a disease when exposed to it.

There are four types of immunity: natural/passive, natural/active, artificial/passive, and artificial/ active.

  • Natural/passive – Babies receive immunities from breastmilk.
  • Natural/active – The body produces antibodies to combat an illness when a person becomes sick.
  • Artificial/passive – This immunity is temporary and requires doses of serum to maintain the immunity.
  • Artificial/active – A vaccination provides artificial/active immunity.

Therefore, the Correct Answer is B.

More Questions on TEAS 7 Science

  • Q #1: Where is skeletal muscle found?

    A. Inside the heart

    B. Attached to bone

    C. Lining the walls of the bladder

    D. Within the gastrointestinal tract

    Answer Explanation

    Skeletal muscle: This muscle cell is striated, long, and cylindrical. There are many nuclei in a skeletal muscle cell. Attached to bones in the body, skeletal muscle contracts voluntarily, meaning that it is under conscious control.

    Smooth muscle: This muscle consists of nonstriated muscle cells that are spindle-shaped. Like cardiac muscle cells, smooth muscle cells contain one nucleus. This muscle type is found in the walls of internal organs like the bladder and stomach. Smooth muscle contraction is involuntary and controlled by the autonomic nervous system.

    Cardiac muscle: This muscle consists of muscle cells that are striated, short, and branched. These cells contain one nucleus, are branched, and are rectangular. Cardiac muscle contraction is an involuntary process, which is why it is under the control of the autonomic nervous system. This muscle is found in the walls of the heart.

  • Q #2: Fertilization (the fusing of one sperm and an ovum) results in a(n) _____.

    A. embryo

    B. fetus

    C. infant

    D. zygote

    Answer Explanation

    Human intercourse consists of the male introducing sperm into the female’s reproductive system. Sperm may then pass through the female’s reproductive system to the Fallopian tubes where one sperm fertilizes an ovum, creating a zygote. The zygote passes out of the Fallopian tube and implants into the uterine wall to begin gestation. Over nine months, the zygote develops and grows into an embryo and then a fetus. An infant is the baby that is born.

  • Q #3: Which of the following types of tissues include cells of the immune system and of the blood?

    A. Connective

    B. Epithelial

    C. Muscle

    D. Neural

    Answer Explanation

    tissue is a group of cells with similar structure and function and similar extracellular substances located between the cells. The table below describes the four primary tissues found in the human body.

    body.