Matters of the heart Dr Louise Robson Department of Biomedical Science University of Sheffield L Robson, University of Sheffield

Matters of the heart Where is it? How big is it? What does it do? How? What happens when we exercise? L Robson, University of Sheffield

Where is the heart in our body? Left arm Right arm Right shoulderLeft shoulder Neck Lungs HEART? Can you feel your heart? L Robson, University of Sheffield

What shape is the heart? L Robson, University of Sheffield

A heart model L Robson, University of Sheffield

How big is the heart? Make a fist! L Robson, University of Sheffield

What does the heart do? Blood Lungs Brain Arms Legs Skin Body L Robson, University of Sheffield

Why does the heart pump blood? L Robson, University of Sheffield

How does the heart pump blood? L Robson, University of Sheffield

The heart has two sides! 1 2 L Robson, University of Sheffield

The heart has two sides! 1 2 L Robson, University of Sheffield

The heart has four chambers! Atria Ventricles L Robson, University of Sheffield

The heart has four chambers! Atria Ventricles L Robson, University of Sheffield

How does blood move through? Atria Ventricles L Robson, University of Sheffield

Blood vessels Arteries & veins How does blood move into and out of the heart? L Robson, University of Sheffield

Arteries & veins Vein Artery Artery from the heart Vein to the heart L Robson, University of Sheffield

Arteries & veins Artery carries oxygenated blood Red Vein carries de-oxygenated blood Blue/purple Can we look at blood vessels today? L Robson, University of Sheffield

Looking at blood vessels on the inside! Angiogram Inject dye into blood vessels Take an X-ray (broken bones) Dye picked up L Robson, University of Sheffield

Angiograms ANGIO.htm L Robson, University of Sheffield

Why does blood move? Heart beats 72 times every minute Contracts Squeezes blood out Balloon model L Robson, University of Sheffield

Heart is made of muscle cells When the heart beats, heart cells get smaller – they contract. L Robson, University of Sheffield

Heart cells change size at the same time When all the cells get smaller at the same time they make the heart contract. This squeezes the blood out. L Robson, University of Sheffield

What happens during exercise? L Robson, University of Sheffield

Let us do an experiment! L Robson, University of Sheffield

What happens Faster heart rateFaster & deeper breathing L Robson, University of Sheffield

What have we covered Heart: where, size, role & how it pumps Lungs: where, role and how they work What happens when we exercise L Robson, University of Sheffield

Something for the teachers! L Robson, University of Sheffield