The Endocrine system
- Chemical messengers
- Chemical is transported in the bloodstream around the body (hormone)
- Stimulates target organs
- The response is brought about by the target organ
- Slow and long-term response
Exocrine vs Endocrine
● Exocrine - duct and has tube that transports substance to target
● Endocrine - secrete hormone directly into bloodstream
What are Hormones
- chemical substances or messengers that enters the blood directly on
secretion from endocrine glands
- carried to target tissues or organs where they regulate the metabolic reactions
(metabolic reactions - is the chemical reactions in the body's cells that change
food into energy)
HYPOTHALAMUS
• The hypothalamus is located at the base of the brain
• The hypothalamus secrete ADH (Antidiuretic hormone)
• ADH controls/conserves the levels of water in the body
• ADH makes the collecting ducts more permeable for the reabsorption of water
PITUITARY GLAND (master gland)
, • The pituitary gland is located at the base of the brain just below the hypothalamus
• The pituitary gland is the most important part in the endocrine system
• The pituitary gland secrete hormones on the basis of the emotional and seasonal
changes
- TSH - thyroid stimulating hormone
- FSH - follicle stimulating hormone
- LH - Luteinizing hormone
- Prolactin - lactation
- ACTH - Adrenocorticotropic (adrenal cortex)
- ICSH - interstitial stimulating hormone
- GH - growth hormone
HORMONES SECRETED BY HYPOTHALAMUS
- Growth Hormone: To stimulate the growth of the bones and tissues.(GH)
- Hypersecretion - gigantism
- Hyposecretion - pituitary dwarfism (organs, bones and muscles very
small)
- Prolactin: To activate the production of milk in lactating mothers
- Follicle Stimulating Hormone: Stimulates the development of the follicle
- Luteinising Hormone: Stimulates ovulation and development of the corpus
luteum
- Thyroid Stimulating Hormone: Stimulates the thyroid gland to secrete thyroxin.
(TSH)
THYROID GLAND
•Secretes the hormone thyroxine which controls the basic metabolism rate
•Affects growth by maintaining the GH content of the pituitary gland / hypophysis
•Affects the functioning of the heart and nervous system
- Chemical messengers
- Chemical is transported in the bloodstream around the body (hormone)
- Stimulates target organs
- The response is brought about by the target organ
- Slow and long-term response
Exocrine vs Endocrine
● Exocrine - duct and has tube that transports substance to target
● Endocrine - secrete hormone directly into bloodstream
What are Hormones
- chemical substances or messengers that enters the blood directly on
secretion from endocrine glands
- carried to target tissues or organs where they regulate the metabolic reactions
(metabolic reactions - is the chemical reactions in the body's cells that change
food into energy)
HYPOTHALAMUS
• The hypothalamus is located at the base of the brain
• The hypothalamus secrete ADH (Antidiuretic hormone)
• ADH controls/conserves the levels of water in the body
• ADH makes the collecting ducts more permeable for the reabsorption of water
PITUITARY GLAND (master gland)
, • The pituitary gland is located at the base of the brain just below the hypothalamus
• The pituitary gland is the most important part in the endocrine system
• The pituitary gland secrete hormones on the basis of the emotional and seasonal
changes
- TSH - thyroid stimulating hormone
- FSH - follicle stimulating hormone
- LH - Luteinizing hormone
- Prolactin - lactation
- ACTH - Adrenocorticotropic (adrenal cortex)
- ICSH - interstitial stimulating hormone
- GH - growth hormone
HORMONES SECRETED BY HYPOTHALAMUS
- Growth Hormone: To stimulate the growth of the bones and tissues.(GH)
- Hypersecretion - gigantism
- Hyposecretion - pituitary dwarfism (organs, bones and muscles very
small)
- Prolactin: To activate the production of milk in lactating mothers
- Follicle Stimulating Hormone: Stimulates the development of the follicle
- Luteinising Hormone: Stimulates ovulation and development of the corpus
luteum
- Thyroid Stimulating Hormone: Stimulates the thyroid gland to secrete thyroxin.
(TSH)
THYROID GLAND
•Secretes the hormone thyroxine which controls the basic metabolism rate
•Affects growth by maintaining the GH content of the pituitary gland / hypophysis
•Affects the functioning of the heart and nervous system
