Cardiac cycle

Today we'll be working on the heart, focusing on what it does and how.  Answer the following questions in your workbooks:

1. Define systole and diastole, and explain what is happening in the heart in each step. - http://biology.about.com/od/anatomy/ss/cardiac_cycle.htm
2. Why do you think that the left side of the heart is more muscular than the right? - http://www.heartsite.com/html/the_heart.html
3. How does the muscle in the heart get oxygen and glucose? What would it use these things for? - http://science.howstuffworks.com/environmental/life/human-biology/heart5.htm
4. Explain how a heart attack happens.  - http://www.nhlbi.nih.gov/health/health-topics/topics/heartattack/
5. What do the valves in the heart do? Name the four valves in the heart and explain where each one islcoated. - http://www.cts.usc.edu/hpg-valvesoftheheart.html
6. What things can go wrong with heart valves? What can these problems cause? - http://www.nhlbi.nih.gov/health/health-topics/topics/hvd/

Use this link to get a good overall picture of the heart - http://www.bbc.co.uk/science/humanbody/body/factfiles/heart/heart.shtml

Finally, try this link - http://www.quia.com/mc/337933.html

Respiration assignment

Today we will e sarting on the assignment for the respiration section we are currently completing.  You need to produce a powerpoint explaining how breathing occurs, explaining the structure and function of each part of the respiratory system.  Use the following links and the video below to help you:

Spirometry - http://www.patient.co.uk/health/Spirometry.htm
respiratory system - http://www.fi.edu/learn/heart/systems/respiration.html
Animtion - http://www.bbc.co.uk/schools/gcsebitesize/pe/appliedanatomy/1_anatomy_respiratorysys_rev1.shtml

Save your work and we will complete it during another lesson. 

Library lesson

THis morning you will be either finishing off posters or finding and interpreting S.E.M. images to meet the criteria for P4.  Use these sites to start with - http://www.sciencephoto.com/ , http://www.anatomybox.com/tag/sem/ or try searching with google images.  Remember, you need to describe images of tissues and cells, NOT whole organisms like ants.

You can work in a word document, but make sure you explain what each image is in your own words - without using copy and paste.  We'll have a lesson on the microscopes next week, so make sure that you have as much of the other criteria done by today as possible.

These are rod and cone cells from the retina in the eye - they receive light and send nerve impulses to the brain allowing us to see.

                                                

I.T. lesson

Today we will be looking at some more infromation on cells and microscopy.  This will help to prepare you for the assignment that we'll start working on next lesson (this friday).  Answer the following questions in your books, using the links below to help you.

1. Give an example of a prokaryotic and one eukaryotic cell.  Outline two differences between them.
2. Explain why mitochondria and chloroplasts have their own DNA.
3. Briefly explain why erythrocytes (red blood cells) have NO nucleus (relate structure to function).
4. Describe the contributions that Scanning and Transmission electron microscopes (SEM and TEM) have made to Science.
5. Click on the link about Plant and Animal cells, and use the animation to describe the structure and function of the golgi complex, cell membrane and mictotubules.  Draw simples diagrams of their appearance.

PDF with some useful information about prokaryoticc/eukaryotic cells - http://www.biologymad.com/resources/AS%20Cells.pdf
Origins of chloroplasts and mitochondria - http://www.biology.iupui.edu/biocourses/N100/2k2endosymb.html
Red blood cells - http://library.thinkquest.org/25896/sub_blood/rbc.htm
Microscopes - http://invsee.asu.edu/srinivas/sizescalemod/microscopy.htm
Plant/Animal cells - http://www.cellsalive.com/cells/cell_model.htm

Try this once you're finished - http://www.nobelprize.org/educational/medicine/2001/cellcycle.html or http://www.sheppardsoftware.com/health/anatomy/cell/index.htm

So yesterday we were talking about how structure of cells relates to their function, and although we ran out of time I thought I'd put up some examples here.

Nerve Cell

The nerve cell has dendrites which are adapted to receiving nerve impulses from other areas.  The myelin sheath helps the impulse to travel quickly along the axon.


Plant Cell
Plant Cells have several structures that relate to their functions.  They have chloroplasts which allows them to photosynthesize, A vacoule to transport water and nutrients, a cell wall to give them structural rigidity.  Plant tissues also structures that help them function such as stomata, plasmodesmata and tracheids.




Intestinal epithelial cell (gut wall)

Intestinal cells have microvilli which increase their surface area.  Because they need energy to absorb nutrients they also have larger numbers of mitochondria.

                                       

Welcome

So this is where I'll be putting material that we'll be using in class or that relates to things we're doing.  To start with, here are some imagess like the ones you've just been using in class:

A typical plant cell



An animal cell