Immune System

Define what a microbe is

• A small infectious agent

• A disease causing agent

• A living thing that can only be seen with a microscope

• A living thing made of a single cell

Tags

NGSS.MS-LS1-1

Define what a pathogen is

• A microscopic agent that can cause harm

• An organism too small to be seen with a microscope

• Any substance that can harm you

• Any bacteria, virus or fungi

Identify the best description of a bacterium.

• Made of many cells

• Single-celled organism without a nucleus

• Single-celled organism with DNA stored in a capsid

• A non-living organism made of DNA and protein

Tags

NGSS.MS-LS1-1

Identify the most accurate definition for a contagious disease.

• A disease caused by factors such as lifestyle and genetics

• A disease that can be passed from person to person

• A disease that is caused by pathogens

• A disease caused by bacteria

Identify which of the following are part of the first line of defence

• cilia

• fever

• phagocytes

• antibodies

Identify which of the following are part of the second line of defence

• phagocytes

• antibodies

• mucus

• stomach acid

Recall how fever helps fight disease as part of the second line of defence

• It flushes pathogens out of the body

• It forms a barrier that stops pathogens from entering the body

• It brings more white blood cells to fight pathogens

• It slows down or kills some pathogens

Name the white blood cells that engulf pathogens

• B cells

• memory cells

• phagocytes

• natural killer cells

Identify one difference between the first and second lines of defence.

• The first line aims to prevent infection while the second line responds to an infection

• The first line is made up of general responses while the second line is made up of barriers

• The first line includes white blood cells while the second line does not

• The first line is only activated if pathogens make it past the second line

Identify the two functions of the third line of defence.

• To prevent entry of pathogens into the body

• To respond in a general way to any pathogens that have entered the body

• To identify and fight specific pathogens

• To remember specific pathogens and respond quickly if they invade again