A cellular component of the innate defenses includes
T cells
natural killer cells
plasma cells
B cells
The Correct Answer is B
A. T cells: T lymphocytes are part of the adaptive immune system and require specific antigen recognition for activation. They provide targeted responses and immunological memory but do not act immediately. Their function is delayed compared to innate immune cells, so they are not a component of innate defenses.
B. Natural killer cells: Natural killer (NK) cells are innate immune cells that act without prior sensitization. They can recognize and destroy virus-infected or abnormal cells immediately. This rapid, non-specific action provides a critical first line of defense against infections and tumor cells.
C. Plasma cells: Plasma cells are differentiated B cells that secrete antibodies as part of the adaptive immune response. They take several days to develop after antigen exposure and are not involved in immediate, non-specific innate defense mechanisms.
D. B cells: B lymphocytes belong to the adaptive immune system and require activation by antigens and helper T cells to produce antibodies. Their responses are specific and delayed, unlike innate immune cells that respond immediately to threats.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Opsonization:Opsonization is the process by which antibodies and complement proteins coat a pathogen, enhancing recognition and binding by phagocytes. This coating increases the efficiency of phagocytosis and helps eliminate the microorganism.
B. Agglutination:Agglutination occurs when antibodies bind multiple antigens together, causing clumping of pathogens. While it helps contain infections, it does not directly facilitate phagocytosis in the same way opsonization does.
C. Chemotaxis:Chemotaxis refers to the directed movement of immune cells toward a site of infection or tissue damage, guided by chemical signals. It does not involve coating pathogens for phagocytosis.
D. Diapedesis:Diapedesis is the process by which leukocytes squeeze through capillary walls to reach infected tissues. It facilitates immune cell migration but is not the mechanism by which pathogens are marked for phagocytosis.
Correct Answer is A
Explanation
A. None of the above are false, all of the above are true:All the statements regarding blood pressure regulation are correct. Blood pressure rises with increased blood volume, cardiac output, or peripheral resistance, reflecting the direct relationships between these variables and arterial pressure.
B. Increase BV, increases BP:An increase in blood volume raises venous return, stroke volume, and ultimately cardiac output, leading to higher blood pressure. This relationship is a fundamental principle of cardiovascular physiology.
C. Increase CO, increases BP:Cardiac output, the product of heart rate and stroke volume, directly affects arterial pressure. When CO rises, more blood is pumped into the circulation per minute, increasing blood pressure if resistance remains constant.
D. Increase PR, increases BP:Peripheral resistance, determined largely by vessel diameter and blood viscosity, opposes blood flow. An increase in resistance requires higher pressure to maintain flow, thereby elevating blood pressure.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.