Tuesday, January 12, 2010
Tues-Day 2
Bio 3/6 - we described the difference between an ENDOCRINE gland (secretes hormones DIRECTLY into the bloodstream in veins, arteries, capillaries e.g. thyroxin is secreted FROM thyroid gland cells directly into the blood) and an EXOCRINE gland/organ (secretes substances OUTSIDE of bloodstream, usually into DUCTS or to the OUTSIDE of cells e.g. sweat, saliva, mucus, bile).
We described the a biofeedback mechanism that the endocrine system uses to maintain homeostasis and gave an example of a NEGATIVE biofeedback mechanism (i.e. hypothalamus to pituitary to thyroid to hypothalamus to control/regulate the metabolic/respiration rate) and a POSITIVE biofeedback mechanism (pituitary to uterus to pituitary - MORE uterine contractions).
We saw a brief animation of the endocrine system- check out the videos on Blackboard.
AP Chem- took the unit exam on transition metal complexes and colligative properties and Raoult's Law.
Please, somebody remind me tomorrow to discuss the Chemistry Olympiad competition. I think that our class/Jericho could decimate the national competition (because we know all about the cause of EVERYTHING: Zeff and OPEL's)
:)
# posted by C @ 9:12 AM 
