Endocrinology Part 1 (Hypothalamus, Pituitary, and Pineal Gland)

Controls flow of information between cells and tissues by releasing hormones

Substances secreted by endocrine gland that conveys information to its target cells

All hormones will act on all cells

Chemical signals produced by specialized cells secreted into the bloodstream and carried to a target tissue (with specific receptor)

Generally, act at sites distant from their place of origin Ex: some pituitary hormone acts on thyroid gland, gonads, adrenal gland

Regulates cells and organs to maintain homeostasis Ex: ADH – regulates water homeostasis Aldosterone – regulates Na homeostasis

hormone concentrations are regulated by?

Actions of hormones

TYPES OF HORMONE ACTION

Acts at a distant site from their place of origin

Acts on the neighboring cells

Acts on its self Ex: hormone produced by hypothalamus will act on hypothalamus

Remain intact/bound to cell membrane; acts on adjacent cells by cell-to-cell contact with cell receptors

how does juxtacrine acts on adjacent cells

Acts inside the cells (non-producible/released)

CHEMICAL COMPOSITION/NATURE OF HORMONES

chemical composition of water soluble hormones

chemical composition of hormones that do not require carrier (transport proteins)

Nature of majority of the hormones

chemical composition of hormones that is synthesized and stored within cells

chemical composition of hormones that is stored inside the cell where they are produced

Example of hormone with peptide & protein nature

Steroid hormones regulates?

Precursor of steroid hormones