Category Archives: 2.1 Breathing and Gas Exchange
Did you know that asthma is one of the most common causes of absence from school? It is a chronic lung disease that often develops during childhood and currently affects an estimated 300 million people worldwide.
Asthma is a very interesting disease because it is extremely common but can only be managed and not cured. Whilst we understand how asthma affects the respiratory system we still don’t understand what exactly causes it. Scientists believe that changes in human lifestyles, human influences on the environment, genetic factors and the development of the immune system in early life may all contribute to the disease.
In recent years the number of people suffering with asthma has increased so rapidly that it is now one of the biggest mysteries in modern medicine! To help raise awareness of this common condition the Global Initiative for Asthma (GINA) has made today World Asthma Day.
To learn more about the symptoms of asthma and how it affects the respiratory system just watch the video below for a clear scientific explanation.
Over the next month I will be posting various resources to help you revise for your exams. This will include hints, tips, videos, summaries, tests and planners. Once they have been posted you will also be able to find them on the relevant pages.
The first resource, available to download now, is a revision tracker. It can be used for any subject but is particularly useful when revising for a factual subject such as Biology. Every time you complete a test or a past paper question, you should write down anything you get wrong on the tracker. This will allow you to keep a note of your weakest topics and help you to focus your revision in the weeks leading up to your exam or test.
I have also posted an IGCSE revision quiz for the whole of Section B: Human Physiology. The quiz takes about 30 minutes to complete and I’d recommend doing it several times as it’s a really effective way to improve your factual recall. I wrote the the quiz using the Edexcel textbook so all the answers can be found there.
Please write in the comments below if you’ve found these helpful, or if there are any other revision resources that you’d like me to create.
When I was at school smoking was everywhere. At 16 you could legally buy cigarettes, smoking was allowed inside pubs and clubs, tobacco was advertised on billboards, and tobacco brands were the prominent sponsors of Formula 1. However, times have now changed and it was only reported in the news last week that UK Ministers will soon be introducing plain packaging for cigarettes and a ban on smoking in cars carrying passengers under 16.
However, two-thirds of smokers start smoking before the age of 18, and studies show that just one cigarette a month is enough to get teenagers addicted for life. So if it’s young people who start smoking, the big question is will any of these changes deter school children from starting the habit in the first place? Tell me what you think by commenting below.
And if you’re unsure as to how smoking harms the body then why don’t you watch Gunther von Hagens, of Bodyworlds fame, explain the dangers of smoking in the video below.