Lymphocyte Function and Immune Response

The video explores the function of lymphocytes T CD4, referred to as T4, through two experiments. The first experiment involves mice with different combinations of lymphocytes T8, T4, and B cells, showing that T4 must work with other lymphocytes for effective immune response. The second experiment uses cultures to demonstrate that T4 cells release interleukin 2, which stimulates the proliferation of T4, T8, and B cells. The findings highlight the central role of T4 in immune response, emphasizing their necessity in combination with other lymphocytes for combating infections.

What is the primary focus of the video?

• The role of B lymphocytes

• The structure of viruses

• The function of T CD4 lymphocytes

• The anatomy of mice

In the first experiment, what happens to the mice that have all their lymphocytes intact?

• They take more than 20 days to eliminate the virus

• They show no immune response

• They eliminate the virus in 7-10 days

• They die immediately

What is the outcome for mice that only have T4 lymphocytes in the first experiment?

• They die without eliminating the virus

• They survive but take longer to eliminate the virus

• They show no change in health

• They eliminate the virus faster than other groups

Which combination of lymphocytes allows mice to survive and eliminate the virus in the first experiment?

• Only T8 lymphocytes

• No lymphocytes

• T4 and B lymphocytes

• Only B lymphocytes

What is the main conclusion from the first experiment regarding T4 lymphocytes?

• They are crucial when combined with other lymphocytes

• They are ineffective in any combination

• They are effective alone

• They hinder the immune response

In the second experiment, what is added to the culture of T lymphocytes?

• Antibodies

• Bacteria

• Antigens

• Viruses

What is the role of interleukin 2 in the second experiment?

• It has no effect

• It stimulates the proliferation of T and B lymphocytes

• It inhibits B lymphocytes

• It destroys T lymphocytes

Which cells produce interleukin 2 according to the second experiment?

• B lymphocytes

• T8 lymphocytes

• T4 lymphocytes

• All lymphocytes

What happens to lymphocytes in the culture when they are not exposed to the supernatant from the first culture?

• They proliferate rapidly

• They die immediately

• They do not proliferate

• They change into another cell type

What is the overall conclusion about the role of T4 lymphocytes from both experiments?

• They are not important in the immune response

• They are harmful to the immune system

• They are central to the immune response through interleukin 2 secretion

• They only work in isolation