In one day, one drop of blood travels 12,000 miles! 1 minute = 75-85 heart beats Blood is about 78% water It takes about 20 seconds for blood to travel through your body… heart to heart. Girls hearts beat faster than boys Heart -y Facts You have 5.6 Liters of Blood in your body!
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In one day, one drop of blood travels 12,000 miles!
It takes about 20 seconds for blood to travel through your body… heart to heart. Heart-y Facts. 1 minute = 75-85 heart beats. In one day, one drop of blood travels 12,000 miles!. Blood is about 78% water. You have 5.6 Liters of Blood in your body!. Girls hearts beat faster than boys. - PowerPoint PPT Presentation
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Transcript
In one day, one drop of blood travels 12,000
miles!
1 minute = 75-85 heart beats
Blood is about 78% water
It takes about 20 seconds for blood to travel through your
body… heart to heart.
Girls hearts beat faster than boys
Heart-y Facts
You have 5.6 Liters of Blood in your
body!
Circulatory SystemCirculatory System
Why didn’t the skeleton want to go school?
Because his heart wasn’t in it….
• The circulatory system is in charge of moving nutrients, gases and wastes to and from cells.
• This system helps maintain homeostasis by stabilizing body temperature and pH.
Three Types of Circulation
1. No Circulation
2. Open Circulation
3. Closed Circulation
No Circulation
• The body system is so basic that every cell is able to obtain nutrients, water and oxygen without the need of a transport system.
Example: Organisms such as – flatworms
Open Circulation
• Blood flows freely in the body cavity
• Blood is NOT contained in vessels.
Examples: Simple organisms such as – Molluscs (clams) and Arthropods (insects)
Closed Circulation
• Blood is always contained in vessels or the heart.
Examples: Organisms such as – humans and ALL vertebrates (have vertebrae or backbone)
Transportation
• Think of your circulatory system like an extensive system of trains . . . they pick up packages and drop them off at another place.
Transportation
• The circulatory system picks up wastes like carbon dioxide and drops off nutrients and oxygen.
Your vessels make up the “tracks” that your blood or “train” flows along.
Blood delivers…
• …Oxygen to all cells.
• …Food to all cells.
• …Wastes to the kidneys.
• …Carbon dioxide to the lungs.
Components of Blood
• Red Blood Cells (RBC)
• White Blood Cells (WBC)
• Platelets
• Plasma
Red Blood Cells
• Transport O2 & CO2
• Lack a nucleus• Contain
hemoglobin• Produced in
bone marrow.
White Blood Cells
• Large
• Contain nucleus
• Defend the body
against disease.
• Produced in bone marrow.
Platelets
• Cell fragments needed for blood clotting.
• Create a “web” to prevent you from loosing blood.
Plasma
• Liquid• Contains proteins• Transports red and
white blood cells, platelets, nutrients, enzymes, hormones, gases and salts.
Blood Types
• There are four blood types: – A– B– AB– O
• This is inherited from your mother and father.
Blood Donation
• You cannot receive blood from just anyone … you have to have the same blood type.
• Because of this, donating blood is extremely helpful for doctors and hospitals.
Blood Vessels
• Three types of vessels: 1. Artery – Carry blood AWAY from the heart
(with O2)
2. Vein- Carry blood back to the heart (with CO2)
3. Capillary – Where arteries turn into veins
Blood Pressure
• Pulse- the surge of blood through an artery
• Blood pressure is the force that blood exerts on the blood vessels. – BP rises sharply when your ventricles contract
but drops when they relax. – These two numbers provide your blood
pressure.
• Normal: 120/80
Heart
• All of your vessels connect to your heart.
• The function of the heart is to keep blood moving constantly through the body.5 karat “Heart” cut diamond
Human Heart
Your Heart
• It is about the size of your fist
• It is located in the center of the chest between the lungs.
• Your ribs and sternum protect your heart and lungs.
• The bottom tip of your heart leans to the left side of your chest... where you pledge to the flag.
Heart Structure
• The heart is made of cardiac muscle.
• All mammals have four chambers in their heart:
1. Left Atria 3. Right Atria
2. Left Ventricle 4. Right Ventricle
Fish Heart
• Fish have a 2 chambered heart.
Fish Heart
Frog Heart
• Frogs have a 3 chambered heart.
Frog Heart
Mammal-Bird Heart
• All mammals (you) and birds have a 4 chambered heart.
Aorta
Pathway through the Heart
• Vena Cava (largest vein in your body)
• Right Atrium• Right Ventricle• Pulmonary Artery
• Lungs (exchanges O2 & CO2)
• Pulmonary Artery• Left Atrium• Left Ventricle• Aorta (largest artery
in your body)• Body Cells
Controlling the Heart
• Pacemaker: a bundle of nerve cells located at the top of the right atrium– Generates an electrical impulse that triggers
your atria to contract/pump– Some people have artificial an pacemaker
• Medulla oblongata: portion of the brain that controls the pacemaker