Blood Circulation
simplified diagram
Red = blood rich in oxygen
Blue = blood low in oxygen
| Human Biology |
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Main Organs Reproduction Digestion Circulation Breathing and the respiratory system
Blood Circulation
The effects of exercise
Heart disease
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Blood Circulation Red = blood rich in oxygen |
Diagram showing blood circulation in the human body
Lungs
Put oxygen into the blood and remove carbon dioxide
Heart
Pumps blood around the body.
The heart consists of TWO pumps (shown red and blue)
The heart contains valves to control the direction of blood flow.
Arteries Blood vessels that carries blood away from the heart
Veins Carry blood back towards the heart.
Capillaries Tiny blood vessels that carry blood to the individual cells. Capillaries join the arteries to the veins.
What is in blood
Red blood cells
Heart disease can be caused by too much fat which clogs the arteries reducing the flow of blood to the
heart. Exercise helps reduce the risk by speeding the flow up blood up which helps clear the arteries.
How to help reduce the risk of heart disease:
Take regular exercise
Eat a balanced diet that is low in fatty foods
Don't smoke (smoking can damage the arteries)
Avoid too much alcohol
The effects of exercise on the body
When we take some form of exercise, e.g. running 400m, we need more oxygen because our muscles are working harder.This makes several things happen:
The pulse rate is the speed our heart pumps at and is measured in 'beats per minute'
You can measure your pulse rate by pressing your fingers against your wrist or the side of the neck. You can feel the surge of blood every time your heart beats.You can use a stopwatch to time one minute and count the number of times your heart beats during that time.It is quite usual to count for just 15 seconds and then multiply the result by four to give you the final pulse rate. Investigating the effect of exercise on pulse rate
In this experment we first measured our pulse while resting before the experiment One of the boys then ran up and down the stairs for five minutes. We took his pulse again as soon as the exercise was over and then again every five minutes.The results are recorded below
Results:
|
|
Heart Rate in beats per minute (b.p.m) |
|
While resting |
80 |
|
Immediately after 5 minutes exercise |
190 |
|
5 minutes after the exercise |
130 |
|
10 minutes after the exercise |
100 |
|
15 minutes after the exercise |
81 |
The pulse was either taken at the wrist (where an artery is near the surface of the body) or the side of the neck just beside the windpipe Conclusion Our results showed us that the heart rate increased rapidly after exercise and then gradually dropped back to normal. The time taken for the pulse to drop back to normal is called the recovery periodand is sometimes used as a measure of fitness (the quicker the recovery period, the fitter you are)
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