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Digestive System: The digestive system breaks down foods and takes out needed nutrients. These nutrients are put into the blood stream for the cells to use as energy. Minerals and vitamins are also put into the blood stream to strengthen bones and the immune system.
Muscular System: The heart is a muscle. The expanding and contracting of this muscle is what pumps blood throughout the body.
Respiratory System: The respiratory system is how oxygen is brought into the body. It enters through the lungs into the alveoli. From there it is sent through blood vessels into the blood stream for the body to use. At the same time, carbon dioxide is brought to the lungs through the blood to be exhaled.
Skeletal System: Marrow inside of bones produces red and white blood cells. These blood cells are parts of the blood stream and are responsible for carrying oxygen and fighting off disease.
Endocrine System: The endocrine system is where hormones are produces. Hormones and other chemicals produced by these glands use the circulatory system to travel to needed parts of the body. Example: Adrenaline, created by the Adrenal gland, travels through the blood stream to the heart causing an increased heart rate.
Immune System: The immune system is made up of white blood cells and antibodies. These things travel inside the blood so that they can be transported to the site of infection/invasion to remove and/or hopefully destroy it. This is how you fight off sickness.
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