25-07-2012, 03:40 PM
Blood & circulation
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Circulation
Your body resembles a large roadmap, There are routes or “arteries” that take you downtown to the “heart” of the city.
3 Major Parts of the Circulatory system
Blood Vessels - routes blood travels
Heart – pumps or pushes blood through body
Blood – carries important “ *stuff ” through body
# 1 Blood Vessels : One Way Streets
Blood Vessels resemble very long and skinny tunnels that are all through your body.
#2 The Heart
4 chambers ( or compartments )
2 upper chambers : Left Atrium Right Atrium
2 lower chambers : Left Ventricle
Right Ventricle
Blood Flow through the Human Body
Heart Rate can be determined using a Stethoscope
Heart Facts
Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.
Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.
Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting.
Your Blood is made of
Plasma
Liquid part of blood
Red Blood Cells
They carry oxygen to all parts of the body
White Blood Cells
Fight and kill germs that may enter your bloodstream
Platelets
Form “scabs” when you cut yourself
Helps stop the bleeding
Blood Types