Inflammation _____

A. Baroreceptor-initiated reflexes:Baroreceptors detect changes in blood pressure and trigger rapid, short-term responses via the autonomic nervous system. While effective for immediate adjustments, they do not provide sustained long-term regulation of blood pressure.

B. Chemoreceptor-initiated reflexes:Chemoreceptors respond to changes in blood oxygen, carbon dioxide, and pH levels, influencing heart rate and respiratory rate. Their effects are primarily short-term and reactive rather than long-term blood pressure regulation.

C. Renal regulation:The kidneys regulate blood pressure over the long term by controlling blood volume through sodium and water retention or excretion. Mechanisms such as the renin–angiotensin–aldosterone system adjust vascular resistance and fluid balance, providing sustained blood pressure control.

D. Neural controls:Neural mechanisms, including sympathetic and parasympathetic regulation, provide rapid adjustments to maintain blood pressure. These controls act within seconds to minutes, making them short-term rather than long-term regulators.

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.