Archive for August, 2010

Muscles and movement

Tuesday, August 31st, 2010

bones of the elbow and forearm, anterior view by robswatski on flickr

In this section we’ll take a look at  the musculo-skeletal system

We’ll talk about the various functions of the skeleton and the different types of joints that exist in the body. 

We’ll focus on the elbow joint, and learn the detailed structure and how it flexes (bends) and extends (straightens). 

We’ll talk about antagonistic muscle pairs and understand why two muscles are needed to operate a joint. 

And finally, we’ll dissect a pig’s trotter to try and identify some of the parts we’ve been discussing. 

To demonstrate your understanding, you will be asked to select one of the following assessments to complete:

  • WRITE a description of how the knee bends and straightens.  Include details of named bones and muscles to convey your understanding.
  • DRAW an annotated diagram/picture to illustrate how the knee bends and straightens. Include details of named bones and muscles to convey your understanding.
  • MAKE a model of a knee joint that can bend and straighten and be able to explain how it works and why you have chosen the materials you used.
  • ACT out a scene that demonstrates your understanding of how the knee joint bends and straightens.
  • Use TECHNOLOGY to create a Comic Life strip to explain how the knee bends and straightens. 

Rubrics

Thursday, August 26th, 2010

Here are the rubrics that will be used to grade your lab reports.  There are 3 – one for design (D), one for data collection and processing (DCP), and finally one for conclusion and evaluation (CE).  You should refer to them every time you have to write a lab report.

FINAL Rubric design      FINALRubric DCP      FINAL Rubric CE

Cell structure

Thursday, August 26th, 2010

E Coli by hukuzatuna on flickr

The syllabus guide for Topic 2 is here: Topic 2 – syllabus outline

You need to be able to draw, label and annotate a diagram of E.Coli (a prokaryote) and a liver cell (a eukaryote).  In addition you should be able to recognize these structures on an electron micrograph like the one pictured. 

You will also have to compare prokarotes and eukaryotes, and compare plant and animal cells.

Here are a couple of great presentations to help you achieve these tasks, and I’ll be giving you several handouts to practice with.  We’ll be getting the light microscopes out for a play too, as well as making our own slides to view.  Presentation on prokaryotesPresentation on eukaryotes.

Pulley systems

Thursday, August 19th, 2010

pulley by Todd Huffman on flickr

Another type of simple machine, besides the lever, is the pulley.  Pulleys can be fixed or movable, and they can be used singly or combined with other pulleys to make pulley systems.  Take a look at this clip to learn a little bit more about pulleys, and be introduced to the idea of mechanical advantage.  And here’s Tim and Moby’s explanation of the same concepts.  If  you want to go further, try reading this.

You are going to (hopefully) get a better understanding of pulley systems by doing an experiment.  Here is the instruction sheet: Pulley lab instruction sheet   Pulley lab data sheet

And finally, once you have understood pulley systems and mechanical advantage properly, you can demonstrate your understanding by designing a pulley system to lift an elephant off the ground into a truck of height 1m.  I can’t wait to see what you come up with!


Murphy’s Law toast drop

Tuesday, August 17th, 2010

bread toasts by FrancoisRoche on flickr

Click here for the information on this lab.

If you are confused about variables, this song might help.  Sing it loud, sing it proud!

Centre of gravity

Monday, August 16th, 2010

gymnast by euze on flickr

Ever wondered how gymnasts and acrobats can do things like this?  We’re about to discover how.  We will learn about centre of gravity (or centre of mass) and stability.

  • Why are Formula 1 racecars so low?
  • Why is it difficult for a tightrope walker to balance on a tightrope?
  • On a double decker bus why shouldn’t all the passengers sit upstairs?
  • Why does a wineglass have wide base?

We will do a lab to identify the centre of gravity of different regular and irregular shapes.  This is the instruction sheet. Centre of Gravity G10 IntSci2

Cell theory

Monday, August 16th, 2010

These are the syllabus statements for this section of the syllabus.  Use this presentation, your textbooks, or any other resources you find helpful to tackle these problems.  We will divide and conquer – a bit like cells specializing in one particular function, each of you will be responsible for one section, and then share your expertise.  This can be notes that you leave as a comment to this post, or a handout for your classmates, or both.

  • Outline the cell theory. 
  • Discuss the evidence for the cell theory.
  • State that unicellular organisms carry out all the functions of life.
  • State that multicellular organisms show emergent properties.
  • Explain that cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others.
  • State that stem cells retain the capacity to divide and have the ability to differentiate along different pathways.
  • Outline one therapeutic use of stem cells.

Unicellular & Multicellular Organisms     Cell Theory    SPECIALIZATION final

STEM CELLS – Laura Lehmann & Shloka Sharan

Significant figures

Friday, August 13th, 2010

Click here for the post on this.

Glogster posters – Science and Safety

Thursday, August 12th, 2010

These are posters that the students made using glogster.  Some are displayed in the classroom.  This was to get them used to using this online resource, as we will be accessing it again in the future.

H Block Integrated Science 1

A John Sunny Disha Nick Yusuke Jamie Harry

Jae Woo Bettina Husan Alex Arshaan Gaea Ramya

Karina Stuart Ammar Daniel

F Block Integrated Science 1

Wei Ari Joshua Kavita Shannon CC

Celina If Kelvin Charlotte Brian Isabel

Nacho Adilet Kate Hank Joy Santi

Daniel Amy

Size DOES matter!

Thursday, August 12th, 2010

H1N1 virus by AJC1 on flickr

You need to compare the relative sizes of molecules, cell membrane thickness, viruses, bacteria, organelles and cells using appropriate SI units.  Here’s a useful link to help get the concepts across.  And another here.

Calculate the linear magnification of drawings and the actual size of specimens in images of known magnification.  We’ll get some practice at this in class using the microscopes.

Explain the importance of the surface area to volume ratio as a factor in limiting cell size.  A good diagram explaining SA/vol ratio can be found here.  As this is a really important concept, we’ll be doing a lab on it.  Read the handout for the method. SA to vol ratio LAB IBH1 Biology