1. CIRCULATION 12.2
HEART
BLOOD
VESSELS

2. Observing a Heart Material: stethoscope Think It Over4. 2.
Observing a Heart
A stethoscope is a medical instrument that makes the sounds inside your body louder and easier to detect. In this activity, you will use a stethoscope to listen to your heart both before and after exercise.
INQUIRY FOCUS Develop a Hypothesis
Procedure
Think about what you already know about how your heart works. Predict what you will hear if you listen to your heart with a stethoscope. What cause
these sounds?
Materials
stethoscope
Material:
stethoscope
2.  Insert the two ear tips of the stethoscope in your ears. Lay the flat surface of the chest piece down on your upper chest. Move the stethoscope around until you can hear your heartbeat most clearly. Give the stethoscope to your partner to try.
Predict whether your heart will sound differently after exercise and, if so, how? 4.
Now do 10 jumping jacks. Immediately after finishing them, use the stethoscope to listen to your heart again. Note whether your heart sounds any different than it did in Step 2. Then give the stethoscope to your partner and let him or her try.
Think It Over
Compare how your heart sounded before and after exercise. Develop a hypothesis to explain what happens to the heart during exercise.
Click here to watch The Wonders of the Heart and Circulatory System
1:12 or click the next slide and watch it embedded.
How do you think exercise helps keep your heart fit?

3. 12.2 Vocabulary Circulatory system Heart Atrium Ventricle Valve Artery
Aorta
Capillary
Vein
Hemoglobin

4. BLOOD DELIVERS MATERIALS Removes Wastes Regulates Body Temperature
Blood transports chemical messengers. Oxygen from your lungs, and glucose from your digestive system to your body cells.
Removes Wastes
Blood takes away wastes from body cells. For example, blood transports carbon dioxide from body cells to your lungs, where it is exhaled.
Regulates Body Temperature
Changes in the amount of blood flow in the skin help carry heat away or prevent heat loss.
Fights Disease
Blood contains cells that attack disease-causing microorganisms.
Click here to watch Bloods journey through the heart 2:14 or click on the next slide to watch it embedded.
DE: Bloods journey through the body 2:14 - NEXT SLIDE

5. The left ventricle must pump blood to the entire body except the lungs.

6. THE PATH OF
BLOOD FLOW
IN EACH BOX, WRITE WHERE THE BLOOD FROM THE HEART TRAVELS. THEN TELL WHERE THE BLOOD TRAVELS AFTER IT LEAVES EACH PART LISTED
RIGHT ATRIUM
It enters the right ventricle.
VEINS FROM THE BODY
It enters the right atrium.
Arteries to the lungs.
It enters capillaries in the lung.
Loop One
Lungs
Arteries
Right side of heart
Left side of heart
Loop Two
Body

7. A Closer Look at Blood Vessels Your blood vessels put end to
end would go around the
earth twice and
still have a lot left over.
100,000 KILOMETERS

8. Arteries
Thick-walled, muscular vessels. Arteries carry blood away from the heart.
Capillaries
Blood flows from the arteries into tiny capillaries. Materials pass easily from the blood, through the capillary walls, into the body cells. The waste product of cells pass in the opposite direction.
Veins
Capillaries merge and form larger vessels called veins. From capillaries, blood enters veins and travels back to the heart. The walls of veins are thinner than artery walls.

9. What Does Blood Contain?
BLOOD HAS “4” COMPONENTS: PLASMA, RED BLOOD CELLS, WHITE BLOOD CELLS, AND PLATELETS. ABOUT 45% OF THE VOLUME OF BLOOD IS CELLS. THE REST IS PLASMA.
WHITE BLOOD CELLS

10. What are they? Red Blood Cells Hemoglobin
Take up oxygen in the lungs and deliver it to cells throughout the body.
Produced in bone marrow.
Have no nuclei.
Live about 120 days.
A protein that contains iron and binds chemically to oxygen in the lungs.
Oxygen = bright red blood. No oxygen = dark red blood.
Picks up carbon dioxide and releases it in the lungs.

11. Plasma White Blood Cells
Carries nutrients and chemical messages.
Carries away most carbon dioxide and other cell wastes.
Proteins make it look pale yellow.
These proteins regulate water in the blood, help fight disease, help form blood clots.
Produced in bone marrow.
Are the body’s disease fighters.
Larger than red blood cells and have a nuclei.
May live for days, months, or years.

12. Platelets Cell fragments that help form blood clots.
Release chemicals that produce the protein fibrin.
Fibrin makes a tiny net of fibers to help blood clots form.

13. Click here embedded
OR.. Click here to hyperlink this DE clip – 1:45

14. A AB B O Anti - A Anti-B Anti – A Anti- B No clumping proteins
Click next slide to learn about these different types of blood.

15. Click here to hyperlink to Types of Blood 6:02 OR CLICK OUTSIDE BOX FOR EMBEDDED.

16. Type AB can accept any other blood type because it has no clumping proteins.
A,O
B, AB B
B,O
A, AB AB
A, B, AB, O
NONE O
A, B, AB
Type O can donate to all blood types because it does not have A or B markers.