cells & systems the circulatory system. the circulatory system what does it do? –your body’s...
TRANSCRIPT
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 …
Aorta
Artery to Lungs
Veins to Heart
Left Atrium
Left Ventricle
RightVentricle
RightAtrium
Major vein to Lower Body
Major vein to Upper Body
Artery to Lungs
Veins to Heart
The Heart Cont …Aorta
Veins to Heart
Left Atrium
Left Ventricle
RightVentricle
RightAtrium
Major vein to Lower Body
Major vein to Upper Body
Artery to Lungs
Carries blood from left ventricle to body
Receives deoxygenated blood and pumps to right ventricle
Receives oxygenated blood and pumps to left ventricle
When it contracts, pumps blood to the body
When it contracts pumpsblood to the lungs
Takes in deoxygenated blood from the lower body
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?
– 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
– Bones are first
• Made up of 4 parts– Red blood cells– White blood cells– Plasma – Platelets
55% of Blood
45% of Blood
Blood• 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
Red
White
Platelets
Plasma
Blood
Red
White
Platelets
Plasma
Blood Facts• Separated Blood• Your body contains
about 5L of bloodor 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
