In one day, one drop of blood travels 12,000 miles! 1 minute = 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 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 O 2 & CO 2 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–A –B–B –AB –O–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 O 2 ) 2.Vein- Carry blood back to the heart (with CO 2 ) 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 Atria3. Right Atria 2.Left Ventricle4. Right Ventricle

Fish Heart Fish have a 2 chambered heart.

Frog Heart Frogs have a 3 chambered 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 O 2 & CO 2 ) 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 –G–Generates an electrical impulse that triggers your atria to contract/pump –S–Some people have artificial an pacemaker Medulla oblongata: portion of the brain that controls the pacemaker

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