What is the role of the helper T-cells in cell-mediated immunity?
Produce chemicals that regulate the level of the immune response.
Recognize foreign antigens and initiate an immune response
Chemically destroy foreign antigens by disrupting cell membranes.
Create antibodies to target foreign antigens.
The Correct Answer is B
a. Produce chemicals that regulate the level of the immune response: While some T-cells can secrete cytokines that regulate the immune response, this is not the primary function of helper T-cells.
b. Recognize foreign antigens and initiate an immune response. Helper T-cells (Th cells) are a type of lymphocyte crucial in cell-mediated immunity. They play a central role in recognizing and identifying foreign antigens (substances recognized as foreign by the immune system). Once they recognize an antigen, they activate other immune cells like cytotoxic T cells and B cells to mount an immune response.
c. Chemically destroy foreign antigens by disrupting cell membranes: This is the function of cytotoxic T cells, not helper T-cells.
d. Create antibodies to target foreign antigens: Antibody production is the function of B cells activated by helper T-cells.
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Related Questions
Correct Answer is B
Explanation
a: Producing coagulation factors - This function is associated more with the liver, which produces various clotting factors involved in the coagulation process.
b. Destroying dying red blood cells: The spleen is primarily involved in the destruction of old or damaged red blood cells. It acts as a reservoir for blood, where it filters out old or abnormal red blood cells, recycling their components and removing any potentially harmful substances.
c: Producing leukocytes before birth - Leukocytes (white blood cells) are primarily produced in the bone marrow, not the spleen.
d: Storing glycogen - Glycogen storage is mainly associated with the liver and muscles, not the spleen.
Correct Answer is B
Explanation
a. Releasing stored bicarbonate: This function helps regulate acid-base balance but is not related to red blood cell production.
b. Producing and secreting erythropoietin: The kidneys produce and release erythropoietin, a hormone that stimulates red blood cell production in the bone marrow.
c. Stimulating conversion of angiotensinogen: This is part of the renin-angiotensin system, which regulates blood pressure and fluid balance, not red blood cell production.
d. Activating vitamin D: This function helps in calcium and phosphate metabolism but is not directly involved in red blood cell production.
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