Do Now Review: On a sheet of paper, write together these terms in a couple of sentences (related to HeLa). Cervix Gynecologist Hysterectomy What is cell culture?

Radiolab Take out your paper with the questions from radiolab yesterday. Homework: Timeline (7 scientific/medical events) Wordlog (14 words) Read 1-7, prepare for a reading quiz on Friday

Endocrine System Function: Composed of glands and hormones produced in the body which help regulate homeostasis. Endocrine Glands: an organ which creates and releases substances into the bloodstream Hormones: chemical messengers that are carried by the blood to a specific cell

Homeostasis How your body keeps the internal environment controlled despite large variations in the external environment Homeostasis: maintaining the internal environment of the body between limits Examples: Body temperature Blood pH Carbon dioxide concentration Blood glucose concentration Water balance

Endocrine vs. Nervous System Major communication systems in the body Integrate stimuli and responses to changes in external and internal environment Both are crucial to coordinated functions of highly differentiated cells, tissues and organs Unlike the nervous system, the endocrine system is anatomically discontinuous.

Nervous system The nervous system exerts point-to-point control through nerves, similar to sending messages by conventional telephone. Nervous control is electrical in nature and fast.

Hormones travel via the bloodstream to target cells The endocrine system broadcasts its hormonal messages to essentially all cells by secretion into blood and extracellular fluid. Like a radio broadcast, it requires a receiver to get the message - in the case of endocrine messages, cells must bear a receptor for the hormone being broadcast in order to respond.

A cell is a target because is has a specific receptor for the hormone Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells. A target cell responds to a hormone because it bears receptors for the hormone.

Glands of the Endocrine System

Model On a normal sheet of paper, draw an outline of a person. Using the play dough given, create models of each of the following organs (to scale): Pituitary Thyroid Adrenal Pancreas (Islets) Testes or Ovaries (pick male or female) Under each labelled organ, write down the function of that organ.