
Who won the battle between the liver and the potato?
Today we reviewed the types of digestion (mechanical/chemical) that occur in the mouth. Next we began investigating the problem, “Do liver cells or potato cells contain more of the enzyme catalase?” Catalase is an enzyme found in most living cells. This enzyme changes a poison that accumulates in cells into harmless substances. The poison is hydrogen peroxide (H2O2), and the resulting harmless substances are oxygen gas (O2) and water (H2O) .
Questions to think about:
- Which substance produced the fastest chemical reaction?
- Would that be the tissue with the most catalase?
- Was the reaction time longer due to less catalase?
- What do the results tell you about the function of the liver?
- How does this experiment demonstrate that tissues serve the need cells have for waste removal?
On Monday we will discuss these points. Your graph and conclusion paragraph are due on Tuesday.
Our Urologists will be presenting the Urinary System on Monday. I hope the groups turned in their Visual Organizers and Exit Tickets for copying. I haven’t really been “hooked” yet=( Let’s see if the urologists will show improvment in that area.
Homework: *****I forgot to give out this assignment in class today.****** Want to earn 10 bonus points on the assignment for checking the blog? If yes, then complete the STARS notes on the Urinary System on pages 642-645.
Upcoming Test: Thursday, January 28 Anatomy II: Digestive System and Urinary System. BEGIN STUDYING! Below are some on-line activities to help you review. Don’t forget to study the sections in your textbook, too.
http://www.syvum.com/cgi/online/mult.cgi/squizzes/biology/GIT2.tdf?1
http://www.syvum.com/cgi/online/mult.cgi/squizzes/biology/GIT2.tdf?0
http://www.syvum.com/cgi/online/mult.cgi/squizzes/biology/excr.tdf?0
http://nature.ca/discover/exm/blddgstvsystm/index_e.cfm