HEART BLOOD VESSELS Observing a Heart 2 4

HEART BLOOD VESSELS

Observing a Heart 2. 4. 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 1. 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 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. 3. 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. How do you think exercise helps keep your heart fit? Click here to watch The Wonders of the Heart and Circulatory System 1: 12 or click the next slide and watch it embedded.

Circulatory system Heart Atrium Ventricle Valve Artery Aorta Capillary Vein Hemoglobin

BLOOD DELIVERS MATERIALS 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. DE: Bloods journey through the body 2: 14 - NEXT SLIDE Click here to watch Bloods journey through the heart 2: 14 or click on the next slide to watch it embedded.

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

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 Arteries 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 Left side of heart Right side of heart Loop Two Body

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. 0 0 0 , S 0 R 10 E T E M KILO

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.

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

What are they? Red Blood Cells Hemoglobin 1. Take up oxygen in the lungs and deliver it to cells throughout the body. 2. Produced in bone marrow. 3. Have no nuclei. 4. Live about 120 days. 1. A protein that contains iron and binds chemically to oxygen in the lungs. 2. Oxygen = bright red blood. No oxygen = dark red blood. 3. Picks up carbon dioxide and releases it in the lungs.

Plasma 1. Carries nutrients and chemical messages. 2. Carries away most carbon dioxide and other cell wastes. 3. Proteins make it look pale yellow. 4. These proteins regulate water in the blood, help fight disease, help form blood clots. White Blood Cells 1. Produced in bone marrow. 2. Are the body’s disease fighters. 3. Larger than red blood cells and have a nuclei. 4. May live for days, months, or years.

Platelets 1. Cell fragments that help form blood clots. 2. Release chemicals that produce the protein fibrin. 3. Fibrin makes a tiny net of fibers to help blood clots form.

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

A B ti- No pr clu ot m ein pi s ng An Anti – A Anti- B Click next slide to learn about these different types of blood. O B A i t An AB

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

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