Cells & Systems The Circulatory System

The Circulatory System What does it do? Your body’s transportation network Transports Oxygen (O) Transports Carbon Dioxide (CO2) Removes Waste products Delivers nutrients

The Essentials The Circulatory System includes … The Heart Veins Arteries Capillaries

The Human Heart

The Heart It is a pump … but did you know …? It is actually two pumps in one? The left side & the right side! The right side pumps blood to your lungs The left side out to your entire body Did you know that is why people believe your heart is on your left side?

The Heart Cont …

The Heart Cont … Left Ventricle Aorta Right Ventricle Artery to Lungs Major vein to Lower Body Veins to Heart Veins to Heart Major vein to Upper Body Left Atrium Right Atrium

The Heart Cont … Aorta Left Ventricle Artery to Lungs Right Ventricle Receives deoxygenated blood and pumps to right ventricle Left Ventricle Artery to Lungs When it contracts pumps blood to the lungs Right Ventricle Receives oxygenated blood and pumps to left ventricle Veins to Heart When it contracts, pumps blood to the body Major vein to Lower Body Carries blood from left ventricle to body Left Atrium Major vein to Upper Body Takes in deoxygenated blood from the lower body Right Atrium Takes in deoxygenated blood from the upper body

The Heart Cont … So now we know the parts … but what does it look like beating? Live Echocardiogram Video

The Heart Cont … Random heart fact … If you were to cut the heart open before a pump, when it pumped the pressure is so strong it could shoot blood up almost 9 meters! 9m = 29.52 feet  basketball rim = 10 feet That means it would 3 hoops tall!

Arteries Veins & Capillaries Your heart pumps blood throughout the body Through 100 000KM of blood vessels! That could wrap around the earth 2.49 times! 3 people stretching all blood vessels tied together could reach the moon! WHAT?!

It looks like this …

Arteries Veins & Capillaries Arteries (think red) Carry blood (oxygenated) away from your heart and lungs to the body Veins (think blue) Carry blood (deoxygenated) towards your heart and lungs from the body

Arteries Veins & Capillaries Blood vessels are made up of 3 different kinds of tissues Connective (outside) Muscle (middle) Epithelial (inside) Arteries in particular have a thick muscular layer? Can you think why?

Arteries Veins & Capillaries Arteries in particular have a thick muscular layer? Can you think why? Answer!... It is what expands/contracts to push your blood along Tiny activity time!

Pulse What is your pulse? Time to find it … Your heart rate or number of times your heart beats in 1 minute Time to find it …

Arteries Veins & Capillaries Other unique features? Veins are thinner than arteries and have special valves that stop blood from flowing backwards!

Arteries Veins & Capillaries

Arteries Veins & Capillaries Osmosis & Diffusion play important roles in the circulatory system Diffusion How your blood cells pick up CO2 and O How your body picks up/releases certain nutrients in your small intestine These all occur in specialized blood vessels called capillaries

Arteries Veins & Capillaries Capillaries are the smallest blood vessels in the body Only 1 cell thick So narrow blood cells can only pass through in 1 cell, single file rows Why?

Arteries Veins & Capillaries

Blood 2nd largest connective tissue in the body Made up of 4 parts Bones are first Made up of 4 parts Red blood cells White blood cells Plasma Platelets 55% of Blood 45% of Blood

Blood Plasma Platelets Red White Blood cells are highly specialized Red: Carry oxygen, no nucleus (more space for O) flexible White: fight infection, eat bacteria Platelets: stop cuts from bleeding (clotting) Plasma: liquid portion of blood, transports nutrients, waste and CO2 Plasma Platelets Red White

Blood Plasma Platelets Red White

White blood cells battle Blood Facts Separated Blood Your body contains about 5L of blood or about 7% of your total body weight! White blood cells battle

White Blood Cells How do they work? White blood cells identify “protein marker” on cells which tell it good or bad Good = keep looking Bad = Nom nom nom! This is why our body can reject organ donations  foreign body in our body Cancer cells are produced in your body so they contain the same cell marker = passed by

Circulatory System Intelligence Test