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Systems Working Together

Science, Grade 6


Table Of Contents: Systems Working Together

1. Link between Cardiovascular and Respiratory Systems
The lungs contain a very extensive network of capillaries. Oxygen moves through the walls of the alveoli into the capillaries and blood. Carbon dioxide and water move in the opposite direction, through the walls of the capillaries into the alveoli. In this gas exchange process, oxygen-poor blood is replenished with oxygen, and carbon dioxide moves into the lung space to be exhaled.
2. Links between Digestive, Nervous and Muscular Systems
A constant dietary source of carbohydrates is important for the functioning of vital organs. Skeletal muscles and brain neurons require carbohydrate (glucose) as a source of cellular energy. When glucose runs low in muscles, you become fatigued. When it happens with neurons of the brain, you feel light-headed, dizzy and confused.
3. Organ Systems During Exercise
During exercise your muscles contract to move your skeleton in different directions and at different speeds. Your heart rate tends to increase as you exercise because this activity requires a constant delivery of oxygen to your tissues. You breathe harder to get rid of excess carbon dioxide and to deliver even more oxygen. Your brain neuron activity is a virtual firestorm of activity as you work to consciously and subconsciously control all aspects of body movement.
4. Healthy Habits, Healthy Organs
To maintain overall body health, it is important to make sure your vital organs are functioning normally. Your lungs should be clear of pollutants, and your blood vessels should not be thickened with excess fat. Your heart needs to be fit and efficient. Reduction in stress will also benefit your body systems by keeping stress hormones at a minimum.
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