B Secrete hormone at a specific time and in direction of blood flow extracellular hormone fluid small amounts, which act on target organ, tissue or cells C. The secretion Endocrine gland activity is often ∴ requlated by other hormones or nerve impulses D Make up an hormone endocrine organ or oducing cells exist in other organs capillaries as tissue or dispersed cells.6 B. Secrete hormone at a specific time and in small amounts, which act on target organ, tissue or cells. C. The secretion activity is often regulated by other hormones or nerve impulses. D. Make up an endocrine organ, or exist in other organs as tissue or dispersed cells