Physical and Chemical Defenses

What is a first line defense?

• Barries within our body which form the immune system.

• When the pathogens gets through the external defenses, and the body's response leads to healing

• The response from our body when a pathogen gets inside our body.

• Physical and chemical barriers which prevent disease-causing pathogens enter your body.

• An example of a first line defense are the immune cells.

What is a second and third line defense?

• A barrier which stops pathogens from getting inside our body.

• Our defense system which destroy's pathogens in the body.

• The barriers also known as surface barriers.

• The physical barriers on the outside of our body.

• A number of physical and chemical barriers trying to prevent foreign substances from getting inside the body.

Which type of external defense is not considered a 'first line defense'.

• Lymphatic Organs

• Tears

• Saliva

• Skin (epithelial cells)

• Mucous and cilia

What is your skin considered as?

• Skin is considered as a second and third line defense barrier.

• Skin is considered as a large cell which helps destroy pathogens.

• Skin is considered a biochemical barrier of the first line defense system.

• Skin is considered as a part of the immune system.

• Skin is considered as first line defense barrier.

What are saliva, tears, mucus and sweat considered to be?

• They are considered to be second and third line defense barrier.

• They are considered to be substances which helps destroy pathogens.

• They are considered to be biological barriers of the first line defense system.

• They are considered to be a part of the immune system.

• They are all a part of the lymphatic organs.

Which structure/s take part in the reflex movements and secretions which remove pathogens from body openings?

• Phagocyte cells

• Skin (epithelial cells).

• Cilia and mucus.

• Lymphocyte cells

• White blood cells

The second and third line defense system is made up of a set of organs and tissues that help protect us from pathogens present inside the human body. Which of the following is not considered a part of this system?

• White blood cells

• Lymphocytes

• Lymphatic organs

• Mucus

• Phagocytes

White blood cells or leukocytes are the body's Immune cells. Which two types of cells do they consist of?

• Multicytes and hagocytes

• Myocytes and lymphocytes

• Multicyctes and lymphocytes

• Phagocytes and lymphocytes

• Phagocytes and androcytes

Tags

NGSS.MS-LS1-3

Where are all white blood cells produced?

• On the lymphocyte.

• In bone marrow.

• On our mucus.

• On the phagocyte.

• On the skin.

What would you consider to be the purpose of the body's defense system?

• To produce pathogens and enable them to multiply.

• To only destroy pathogens in the body.

• To only stop pathogens from getting into our body.

• To provide space for pathogens to move within our body.

• To stop pathogens getting into the body and destroy pathogens inside the body.