Pituitary Hormones and Their Target Glands — NEET Biology

Which of the above statements are correct? S1: Hormones are non-nutrient chemicals that act as intercellular messengers and are produced in trace amounts. S2: The classical definition of hormones emphasizes their secretion by ductless glands and subsequent transport through blood to distantly located target organs. S3: The neural system, unlike the endocrine system, is primarily responsible for the continuous regulation of cellular functions throughout all cells of the body. S4: Hypothalamic hormones that regulate the anterior pituitary reach it through direct neural regulation, while the posterior pituitary is regulated by a portal circulatory system. S5: The endocrine systems of invertebrates are typically more complex and diverse than those found in vertebrates.