Endocrine System

Endocrine System Endocrine – “ductless glands” Secretions directly enter blood and travel to every body

organ But not all cell respond…only target cells w/specific

receptors Hormone

• signal molecule that binds to cell receptors• Change cm permeability

• Synthesize proteins

• Stimulate mitosis

• Activate/inactivate enzymes

• Regulate long term or continuous processes

Stimuli

Stimuli - activates the endocrine organs Most hormones regulated by neg feedback 3 types of stimuli:

• Hormonal• Most common

• By other hormones

• Humoral• Blood borne chems (ions/ nutrients)

• Neural• By nerve fibers

Structural Classifications of Hormones Peptide Hormones

• Made of amino acids• Initiate rapid changes in the body• Stay in blood (broken down there)• Bind to receptor to initiate 20 messenger inside cell

Lipid Hormones (steroids)• Made from cholesterol and fats• Long lasting effects• Broken down within a cell • Used to regulate body fluid and sexual reproduction• Diffuse through cell membrane of target cells

Organs of Endocrine System Pituitary Gland Pineal Gland Adrenal Gland Thyroid Parathyroid Pancreas Thymus Gonads

• Ovary• Testes• (Placenta)

The Endocrine System Project Create a Poster on an endocrine organ including the following

information: • Title (name of Organ)

• Location in body & Size

• Names of Hormones secreted & their functions and target organs in the body

• Brief description of any associated diseases (over or underproduction)

• Any other interesting facts or tidbits

Present Organ to class and Point it out on dissectible torso in room, complete chart as other groups are presenting

Write an essay giving an overview of the endocrine system & description of each of the glands. Finally, if you had to give up one of your endocrine organs, which would it be and why? (It must be an organ you currently have in your body!)