Aim: How does the endocrine system work to maintain homeostasis? Do Now: Explain how impulses travel from nerve cell to nerve cell
Remember: Your nervous system senses impulses over a system of wire-like neurons that carry messages from one cell to another
The Endocrine System Just like the nervous system, the endocrine controls body activities Controls body activities through messengers (hormones) The endocrine system is made up of glands that release their hormones into the blood stream.
Main Function: It releases hormones into the blood to signal other cells to behave in certain ways. It is a slow but widespread form of communication
A gland makes a hormone and stores it until it is needed. When the hormone is needed the hormone is released into the blood stream. It will travel around the body in the blood until it finds its matching receptor molecule located on or in its target cell. The hormone binds to the receptor molecule and delivers its message.
Fit together – same shape and size
Master Gland- Releases 9 hormones- located on the base of the skull in the brain Growth hormone (GH) Thyroid-stimulating hormone (TSH) Luteinizing hormone (LH) Follicle-stimulating hormone (FSH)
To much growth hormones (GH) in early childhood can result in a condition called gigantism. To little GH can result in Pituitary Dwarfism.
Hypothalamus Part of the brain above and attached to the pituitary gland Controls the release of hormones from the pituitary gland Connects nervous system and endocrine system
Thyroid Gland Disorders: If the Thyroid Gland produces too much Thyroxin, it can cause a condition known as Hyperthyroidism. If to little thyroxin produces it is called Hypothyroidism.
Adrenal Gland Releases Adrenaline- helps the body prepare and deal with stress Also, helps kidneys to function
Pancreas releases the hormone insulin which signals the cells to take glucose in from the blood. Diabetes- The pancreas doesn’t release insulin or use it properly
Ovaries- secrete(release) progesterone and estrogen- controls menstruation and ovulation Testes- release testosterone- male characteristics Ex: facial hair