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: Ovaries - The ovaries are the female reproductive organs where oogenesis occurs, but they are not the process itself.
b. Oogenesis: Oogenesis is the process by which female gametes (egg cells) are produced through meiosis in the ovaries.
c: Ovulation - Ovulation is the release of a mature egg from the ovary, not the process of egg cell formation.
d: Oocytes - Oocytes are immature egg cells found within the ovaries; they undergo oogenesis to mature into eggs.
Correct Answer is A
Explanation
a. Subclavian vein: The lymphatic system drains lymph into the cardiovascular system at the subclavian veins, specifically where the lymphatic ducts (thoracic duct and right lymphatic duct) empty.
b. Carotid artery: This is an artery supplying blood to the brain, not involved in returning lymph.
c. Ascending aorta: This is the part of the aorta that rises from the heart and distributes oxygenated blood, not involved in lymph return.
d. Jugular vein: While close to the lymphatic ducts, lymph specifically drains into the subclavian veins.
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