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.
Nursing Test Bank
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Related Questions
Correct Answer is C
Explanation
a. Endoplasmic reticulum: The ER is involved in protein and lipid synthesis but is not the primary site of ATP synthesis.
b. Ribosome: Ribosomes are involved in protein synthesis but do not play a direct role in ATP production.
c. Mitochondria: Mitochondria are known as the powerhouses of the cell because they generate ATP through cellular respiration. Enzymes in the mitochondria facilitate the release of energy from nutrients, which is then used to recharge ATP molecules.
d. Lysosome: Lysosomes contain digestive enzymes that break down waste materials and cellular debris, but they do not produce ATP.
Correct Answer is C
Explanation
a. Reabsorption: Reabsorption is the process by which the kidneys reabsorb water and other needed solutes from the filtrate back into the bloodstream.
b. Incontinence: Incontinence is the involuntary loss of urine.
c. Micturition: Micturition is the voluntary process of emptying the urinary bladder. Urine is produced by the kidneys, stored in the bladder, and released through the urethra when the bladder muscles contract and the sphincter relaxes.
d. Filtration: Filtration is the process by which the kidneys remove waste products and excess water from the blood to form urine
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