We Got the Beat

Copyright © 2008 by Youth Take Heart

1.What does the human heart look like?

*Use the clay you were given to modelWhat you think a heart looks like

Goal: To explain the structure and function of the humanHeart.

?

What is the function of thehuman heart?

Different kinds of pumps:

Bike pump Camera Duster Turkey Baster

What features do they have in Common?

They all…..

•Have an open chamber (air space)

•Have flexible walls

•Move fluids in and out

•Have valves

Common ValvesCar Tire

http://www.microfiberplus.com/tires.htm

Air Mattress

http://www.alpharubicon.com/prepinfo/images/tempsheltbedspitfire2208.jpg

Bike Tubehttp://www.germes-online.com/direct/dbimage/50114262/Bicycle_Valves.jpg

Heart Animations:

HABITS OF THE HEART ©

Click (or Right Click) Play Button to open link

Revising your heart model:

How has your thinking changed?

1.Make any changes to your heart model that you would like.

2.Sketch and describe the changes you made in your science notebook.

3.Explain why you changed your model.

Background Reading:

“Your Heart & Circulatory System”

Click (or Right Click) Play Button to open link

Heart Diagram:

1. Label the following parts:

• atria, valves, ventricles, vena cava and aorta

2. Draw the path of the blood traveling through the heart (use color code below)

----- Oxygen-rich blood

----- Oxygen-poor blood

3. Explain to your partner the path the blood takes as it travels through the heart

Brainstorm:

•How could a pump fail?

•What can go wrong with your heart as a pump?

*Try to think of at least 3 problems a pump/heart could develop

Design Challenge

Design a solution to this problem:• Amy, a 13 year old student at Deer Ridge Middle

School, recently went for a physical for volleyball. She was born with congenital aortic valve stenosis.

• Congenital aortic valve stenosis is a narrowed valve in the aorta.

• When she was born, Amy’s body wasn’t getting as much blood as it could from the left ventricle.

• Her replacement valve, which comes from the outside of a pig heart, has become calcified. Calcium has built up on the aorta. (See next slide.)

Calcification on the valve

Opening in valve where blood leaks backward

Aortic valve viewed from above

Calcified Aortic Heart Valve

Calcification on the valve

Image courtesy of CDC/ Dr. Edwin P. Ewing, Jr.

Amy’s doctor said,

“Unfortunately you will need another valve replacement to fix your blood flow problem. We have hired a team of bioengineers to design an artificial

valve for you. You won’t be able to play this year, but with any luck, you

should be ready for the volleyball team next season!”

http://commons.wikimedia.org/wiki/Image:Pulmonary_valve_stenosis.svg

Normal heart vs. Pulmonary valve stenosis

Examples of Artificial Valves

http://commons.wikimedia.org/wiki/Image:Starr-Edwards-Mitral-Valve.jpgPhotos courtesy of Rachel Hervey

Final Thoughts

• Two positives of the lesson

• One wish