(a) Hypothalamus

Hormones secreted by hypothalamus include Releasing Hormones. These hormones stimulate the secretion of the pituitary hormone. Examples of these hormones are:

i. Gonadotrophin-releasing hormone

ii. Thyrotrophin-releasing hormone

iii. Somatotropin-releasing hormone

iv. Adrenocorticotrophin-releasing hormone

Inhibiting Hormones inhibit the secretions of the pituitary hormone. Examples of these hormones are:

i. Somatostatin

ii. Growth-inhibiting hormone

iii. Melanocyte-inhibiting hormone

(b) Pituitary: The pituitary gland has two components, i.e., adenohypophysis and neurohypophysis. Hormones secreted by the adenohypophysis are:

i. Growth hormone (GH)

ii. Prolactin

iii. Thyroid-stimulating hormone (TSH)

iv. Adrenocorticotrophic hormone (ACTH)

v. Luteinizing hormone (LH)

vi. Follicle-stimulating hormone (FSH)

vii. Melanocyte-stimulating hormone (MSH)

Hormones secreted by the neurohyphysis are:

I. Oxytocin

II. Vasopressin

(c) Thyroid: The thyroid gland secretes 3 hormones namely, thyroxin, triiodothyronin and calcitonin (t3 t4)

(d) Parathyroid: Secretes a hormone known as parathyroid hormone.

(e) Adrenal: The adrenal gland is divided into 2 parts, the outer adrenal cortex and the inner adrenal medulla. Hormones of adrenal cortex include the following:

i. Mineralocorticoids: Secreted is known as adlosterone.

ii. Glucocorticoids: Secreted is cortisol.

Hormones of adrenal medulla are adrenal and nor-adrenalin.

(f) Pancreas: insulin and glucagon.

(g) Testis: testosterone.

(h) Ovary: estrogen and progesterone.

(i) Thymus: Hormones secreted by the thymus are thymosins.

(j) Atrium: The walls of the atrium secrete atrial natriuretic factor.

(k) Kidney: erythropoietin.

(l) G-I tract: Gastrin, secretin, cholecystokinin (CCK), and gastric inhibitory peptide (GIP).