What are the most abundant agranulocytes?

A. Stomach and small intestine: the GI tract is not the normal major site of senescent RBC destruction.
B. Lymph nodes and thymus: lymph nodes filter lymph and the thymus is for T-cell maturation; they are not primary sites for normal RBC clearance.
C. Red bone marrow: red marrow produces RBCs and may phagocytose some defective cells, but it is not the main location where most senescent RBCs are removed.
D. Stomach and liver: the liver (Kupffer cells) does phagocytose some RBCs, but the stomach is not a primary site for RBC removal.
E. Spleen and liver: most senescent or damaged RBCs are removed by splenic macrophages (the spleen is the primary site) with additional clearance by liver (Kupffer) cells; RBC lifespan ≈120 days.

A. It acts on the hypothalamus to decrease appetite: Appetite regulation is linked to hormones like leptin and ghrelin, not ADH.
B. It causes the release of hormones from the adrenal cortex: ACTH from the anterior pituitary does this, not ADH.
C. It causes smooth muscle contraction in the female reproductive tract: Oxytocin is responsible for uterine contractions, not ADH.
D. It causes vasodilation: ADH (vasopressin) actually causes vasoconstriction, not vasodilation.
E. It increases water retention from renal tubules: ADH acts on the collecting ducts of the kidney to promote water reabsorption, reducing urine output and conserving body water.