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

Resources• http://www.stemnet.nf.ca/CITE/cardio.htm• http://www.cln.org/themes/circulatory.html• http://www.biologymad.com/heartdissection_files/frame.htm• http://www.gwc.maricopa.edu/class/bio202/heart/anthrt.htm• http://www.kidshealth.org/kid/body/heart_noSW.html• http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AnimalHea

rts.html• http://www.biology4kids.com/files/systems_circulatory.html• http://www.accessexcellence.org/AE/AEC/CC/heart_background.ht

ml• http://www.easyrashi.com/heart_misconceptions.htm