Endocrine system function and hormones
Endocrine system: The system concerned with the formation and secretions of hormones is endocrine system.
Endocrine gland: Endocrine glands are ductless gland that empty their secretions directly into blood.
They produce hormones.
Name of endocrine glands-
- Pituitary gland
- Thyroid gland
- Parathyroid gland
- Adrenal gland
- (Kidney, liver, placenta etc. secrete hormone by their endocrine cells. But they are not endocrine glands).
Hormones of pituitary gland and their functions-
1. Anterior pituitary –
- Growth Hormone(GH)
- Adreno Cortico Tropic Hormone(ACTH)
- Thyroid Stimulating Hormone(TSH)
- Follicle Stimulating Hormone(FSH)
- Leutinizing Hormone(LH)
2. Posterir pituitary –
- Antidiuretic Hormone(ADH)
Functions of pituitary hormones-
Growth hormone – Stimulates body growth.
Adrenocorticotropic hormone – Causes the adrenal cortex to secrete adrenocortical hormone more.
Thyroid Stimulating hormone – Stimulates thyroid gland to secrete hormone.
Follicle stimulating hormone – Helps in growth of follicle in overies during ovulation.
Leutinizing Hormone – Helps in sexual activity and fertility.
Prolactin – Promotes the secretion of milk.
Antidiuretic hormone – Increase H2O reabsorption in kidney.
Oxytocin – contracts the uterus to induce labour.
Hormone of thyroid gland and their functions-
Hormone of thyroid gland-
A. Thyroxine and tri-oidothyronine-
a. Increase the general level of body metabolism
b. Help in normal growth and development
B. Calcitonin- Decreases ca++ concentration in extra cellular fluid.
Parathyroid hormone and their functions-
Hormone of parathyroid gland.
Increase Ca++ absorption in intestine.
Helps in bone formation, remodelling and repair.
Controls Ca++ concentration in extra-cellular fluid.
Hormones of pancrease –
Insulin- Reduce blood glucose level and increase carbohydrate storage in the body.
Glucagon- Increase blood glucose level and increase glucose release form liver.
Hormone of testis –
Stimulates the growth of male sex organs.
Promotes the development of male secondary sexual characteristics.
Hormones of ovary –
Estrogen– Stimulates the development of female sex organs, breast and secondary sexual characteristics.
Maturation of accessory sex organs of female.
Maintain the secondary sexual characteristics of female.
Prepares the endometrium for implantation of fertilized ovum.
Relaxin – Facilitates delivery by softening and dilating the uterine cervix.