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Body Systems - Grade 4
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Body Systems - Grade 4

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  • 1. By: Niti Leera Ayana
  • 2. CIRCULATORY SYSTEM  The circulatory system is an organ system that permits blood and lymph circulation to transport nutrients (such as amino acids and electrolytes), oxygen, carbon dioxide, hormones, blood cells, etc. to and from cells in the body to nourish it and help to fight diseases, stabilize body tempreature and pH, and to maintain homeostasis.
  • 3. BLOOD  Blood is constantly circulating fluid providing the body with nutrition , oxygen and waste removal. Blood is mostly liquid, with numerous cells and proteins suspended in it, making blood “thicker” than pure water. The average person has about 5 liters (more than a gallon ) of blood.  The liquid called plasma makes up about half of the content of blood. Plasma contains proteins that help blood to clot, transport substances through the blood, and perform other functions. Blood plasma also contains glucose and other dissolved nutrients. About half of blood volume is composed of blood cells.  Red blood cells, which carry oxygen to the tissues.  White blood cells, which fight infections.  Platelets , smaller cells that help blood to clot.
  • 4. AMAZING FACTS!!!  It takes 20 seconds for blood to circulate the entire body , oxygenated blood leaves the aorta about one mile an hour  The power output of heart ranges from 1-5 watts per minute , which is equivalent to the usage of a 60 watt bulb. It has been said that enough energy is produced a day to drive a truck 20 miles.

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