Nervous system

October 10th, 2011

Neurons in the brain - illustration by Rebecca-Lee on flickr

Some of the questions we’ll be tackling in the next section of the syllabus (6.5) are:

Do you know what the CNS and PNS are?

Can you explain what role receptorssensory neurons, relay neurons,motor neurons and effectors play in conducting nerve impulses?

Can you draw and label a diagram of a motor neuron?

Can you define resting and action potentials?

Can you explain how nerve impulses pass along a neuron?

Can you explain how impulses travel from one neuron to the next?

Read through your textbook pages 240-246 to get a head start on this unit 🙂

And once again, a great presentation from Mr Stephen Taylor in Bandung to help you learn this stuff!

In class we will use this presentation – Nervous System

There are some useful animations here, and here that might help you visualize what’s happening.

Here is the lab we will do on reaction times:  Grade 12 IB HL Biology Reaction times lab

Muscles and movement

October 4th, 2011

electron microscopy of skeletal muscle by jgryall on flickr

In this unit we will be looking at the following key questions:

Why do muscles work in pairs?

What is a sarcomere and what does it have to do with muscle contraction?

How do muscles contract?

A great presentation on this can be found here.

Good animations to help explain what’s going on can be found here.

 

Block C immune system notes

September 21st, 2011
Alisa, Pratik and Sarita the immune system Define the term pathogen

Outline the role of the skin and mucous membranes in defence against pathogens.

Outline how phagocytic leucocytes ingest pathogens in the blood and in body tissues.

Describe the process of blood clotting.

Toni. Yurie. Sinchita. Biology Immune System Notes Outline the effects of HIV on the immune system. 

Discuss the cause, transmission and social implications of AIDS.

Bianca, Gio, Laura Define active, passive, natural and artificial immunity. 

Describe the production of monoclonal antibodies and their use in diagnosis and treatment.

Hong, Haruka, Soo Wan Antibiotics against bacteria and viruses Distinguish between antigens and antibodies. 

Explain why antibiotics are effective against bacteria but not against viruses.

Outline the principle of challenge and response, clonal selection and memory cells as the basis of immunity.

Daniel Shloka Caitlin ANTIBODY PRODUCTION Explain antibody production.
sona_yoshi_alessandra_vaccinations principles pros and cons Explain the principle of vaccination. 

Discuss the benefits and dangers of vaccination.


 

 

Block A immune system notes

September 20th, 2011
Rina, Ray Ruman Immune System Notes Define the term pathogen

Outline the role of the skin and mucous membranes in defence against pathogens.

Outline how phagocytic leucocytes ingest pathogens in the blood and in body tissues.

Describe the process of blood clotting.

HIV and AIDS 

 

Outline the effects of HIV on the immune system. 

Discuss the cause, transmission and social implications of AIDS.

Amber-Fergus-Aki-Immunity Define active, passive, natural and artificial immunity. 

Describe the production of monoclonal antibodies and their use in diagnosis and treatment.

immune system block A, dawoon anna alex Distinguish between antigens and antibodies. 

Explain why antibiotics are effective against bacteria but not against viruses.

Outline the principle of challenge and response, clonal selection and memory cells as the basis of immunity.

Antibody production Explain antibody production.
Explain the principle of vaccination Explain the principle of vaccination. 

Discuss the benefits and dangers of vaccination.

 

Why don’t we get sick more often?

September 19th, 2011

antibodies by AJC1 on flickr

Our bodies remain healthy despite coming into contact with germs and microbes many times a day.  This is due to the fact that we have a pretty efficient defence system that protects us from disease.  See here for a presentation on this topic.  For Higher Level students, you need to go further, so here is another useful presentation.

You will be required to make notes for yourself and your classmates on some aspect of this topic.  You may choose to create a podcast, slideshow, prezi or simply a set of written notes.  Get creative!  To see your assignment, please click on the following links.

Defence groups BLOCK A

Defence groups BLOCK C

 

 

Gas exchange

September 12th, 2011

Do you know the difference between respirationbreathing and gas exchange?

You will, hopefully, by the end of the next topic.  Here are some resources to help you.  This one gives basic factual information.  This one is interactive.  And this one from Get Body Smart is also good.

Watch this excellent video from TEDMED where Dr Keshavjee brings a breathing lung on stage!

YouTube Preview Image

This one, about a smoking 2 year old, is much more disturbing to watch!  Again, thanks to Mr Taylor over at iBiology for finding the resource.

 

Be still my beating heart

September 1st, 2011

maximum heart rate 214 by Laurel Fan on flickr

In class this week and next we will be working on a lab dealing with factors affecting heart rate.  Your task is simple – to designcarry out and write up your findings on how a particular factor affects heart rate.

Begin by listing all the factors you can think of that might influence how fast or slow your heart beats.  Decide on one independent variable to test, and write it in the form of a research question.  Next write a hypothesis, including justification.  Then plan an experiment to test your hypothesis, remembering to state clearly how you will control all the variables you mentioned earlier.

Then comes the fun part – performing your plan.  You may need to ask, beg, bribe some of your classmates or family members to participate.  Once you have your data, process it and present it appropriately, explain your findings, and evaluate both your results and your method.  Suggest improvements for next time.

Phew!  That should take a while…. This is a great opportunity for you to boost your IA scores and gain complete on the various aspects of lab grading.  Here is the  Design rubric DCP rubric CE rubric

 

If I only had a heart ….

August 25th, 2011

Beef heart dissection by Lilliput Station on flickr

This is one of my favourite topics 🙂  We’ll learn about the human transport system – blood, blood vessels and the heart.

These are the one and two presentations that we will use in class. This one from Mr Hobbins also very good: How-your-Heart-beats and 6.2 Transport

And for all you budding surgeons, here is a virtual heart transplant to try.

Just a few of the questions we need to answer:

  • What is blood made of?
  • Why do we need a transport system?
  • How is the structure of the heart related to its function?
  • Why and how is the structure of arteries, veins and capillaries different?
  • How is heart rate controlled?

Demonstrating digestion and absorption

August 22nd, 2011

Here is the instruction sheet for this lab, along with the rubric.  Lab – Demonstrating Absorption You will be assessed on conclusion and evaluation only for this lab.  You need to submit the following by Thurs 1st Sept – hard copy please.  Here is the rubric for this lab: CE rubric

A copy of the lab sheet.  Your hypothesis, including justification. Your data tables. Your conclusion and evaluation.

Do you have guts?

August 15th, 2011

Plastic model by mricha15 on flickr

This unit is part of the bigger Topic 6 of the syllabus.  In this section we need to be able to:

  • Explain why digestion is necessary, and what role enzymes play in digestion.
  • Draw and label a diagram of the human digestive system.
  • Outline the functions of the main parts of the digestive system.
  • Distinguish between absorption and assimilation.
  • Relate the structure of the villus to its function.

The syllabus guide is here: Topic-6-syllabus-outline

Some excellent resources to help us through this unit.  Here, here and here.

We’ll also do a dissection of animal intestines, so look forward to that!  When else will you have the opportunity to put your hand inside a goat’s stomach or simulate peristalsis with real intestines?