Question 1:
What is the meaning of immunity?
Answer:
Immunity is the body’s ability to fight against disease infections caused by pathogens or foreign substances, by specifically fighting the particular pathogen.
What is the meaning of immunity?
Answer:
Immunity is the body’s ability to fight against disease infections caused by pathogens or foreign substances, by specifically fighting the particular pathogen.
Question 2:
Name two characteristics of the skin that allows the skin to react as an effective first line of defence.
Answer:
The skin is a physical defence that prevents the entry of pathogens. The pH of the skin which ranges from 3 to 5 provides an acidic environment which is unfit for microbial growth.
Name two characteristics of the skin that allows the skin to react as an effective first line of defence.
Answer:
The skin is a physical defence that prevents the entry of pathogens. The pH of the skin which ranges from 3 to 5 provides an acidic environment which is unfit for microbial growth.
Question 3:
How does the phagocyte destroy pathogens that have penetrated the first line of defence?
Answer:
Phagocytes carry out phagocytosis by surrounding, trapping and digesting pathogens.
How does the phagocyte destroy pathogens that have penetrated the first line of defence?
Answer:
Phagocytes carry out phagocytosis by surrounding, trapping and digesting pathogens.
Question 4:
Differentiate between antigens and antibodies.
Answer:
Antigen is a foreign substance that enters the body.
Antigen is usually a protein molecule found on the wall or external membrane of a pathogen.
Antibody is a protein produced by lymphocytes that functions to destroy the antigen.
Differentiate between antigens and antibodies.
Answer:
Antigen is a foreign substance that enters the body.
Antigen is usually a protein molecule found on the wall or external membrane of a pathogen.
Antibody is a protein produced by lymphocytes that functions to destroy the antigen.