4.3.1 The Heart of the Matter Form a ball of pink clay (about the size of a quarter) into a short fat strawberry. Which chambers does the pointed end of the carrot correspond to? The atria or the ventricles? Lay the heart on the tabletop and flatten the back side of the heart just a bit. Using what you know about the structure of
the heart, sketch the four main chambers into the clay with a pencil (on the heart). Note that the heart is responsible for pumping blood to all of the organs of the body, but remember, the tissue of the heart also needs to be bathed in blood. The hardworking muscle needs a constant supply of oxygen. The muscle of
the heart receives blood through tiny vessels called the coronary arteries. Visualize the system of coronary arteries by looking at the following diagram: Use your clay tools or a pencil to carve the following coronary arteries
in your clay heart. Left Coronary Artery (Left Main) Left Anterior Descending Circumflex Artery Right Coronary Artery Roll out a thick piece of pink spaghetti about 1
inch long. You will use this piece of clay to create the aorta. Place the end of the spaghetti onto the top of the heart. This piece should stick up like a cherry stem, bend back towards the dorsal side of the heart and run down the back of the organ. Place the heart in the chest cavity. Pay
attention to whether you have the right side or the left side of a Maniken. Think about how heart placement would be different in each case. What types of muscle assist with moving blood around the body? What role do valves play in the heart? Which structure in the heart functions as the natural
pacemaker? What is the difference between pulmonary circulation and systemic circulation? Thinking about function, explain why the left ventricle is much more muscular than the right ventricle. 4.3.3 Go With The Flow 1. Carefully take a long strand of pink clay and press the end of the clay on the
medial end of the clavicle. The clay strand should run behind the clavicle. This branch will represent the subclavian artery. This artery services the upper limb. subclavian artery 2. Run the strand along the clavicle and drop the end through the armpit. You will most likely need to go behind some of the muscle you created. If you find it
difficult to drop the piece down the arm, simply break off the piece and begin the strand past the muscles. The artery will look as if it passed through the area. 3. Continue the long strand out of the armpit along the medial side of the humerus (next to the ulnar nerve). This represents the brachial artery. brachial artery 4. Bring the strand forward to the fold of the elbow (antecubital region). Angle the strand to run along the medial side of the radius down towards the
palm. The strand running along the radius represents the radial artery. 5. Curve the strand back around so it begins traveling up the medial side of the ulna. This strand will continue until it rejoins the brachial artery at the antecubital region. The strand in the palm represents the superficial palmar arch. The strand that runs along the medial side of the ulna represents the ulnar artery radial artery ulnar artery
superficial palmar arch 6. Think about how we supply blood to the fingers. Create thin spaghetti strand out of pink clay. Add individual strands coming off the palmar arch and down to each finger. These strands will represent the digital arteries. digital arteries
Remember that muscle requires a constant supply of blood. Using small strands of clay, form small arteries that feed this tissue of the brachialis muscle. Branch these arterioles off one of the major arteries you have built. Return to the clavicle region. 7. Break off a piece of pink spaghetti approximately 1-1
inches long. Join the end of the clay to the medial end of the clavicle (where the subclavian artery begins). Place the strand upward along the side of the neck. This strand represents the carotid artery. carotid artery Label the following arteries on your
Femoral Artery Popliteal Artery Posterior Tibial Artery 1. Position your Maniken so the dorsal side of the arm is facing you. Take a small piece of blue spaghetti and run this vessel along the subclavian artery. This vessel will represent the subclavian vein.
2. Take a single strand of blue clay and grab both ends of the loop with one hand. Let the clay hang down and form a loop. Place the loop on the dorsal side of the metacarpals to form the dorsal venous network. 3. Place the strand that is on the radial side (lateral) along the radius. The vein will stay on the dorsal side of the arm and will travel up the radius. When you reach the antecubital region (fold of the elbow), bring the strand forward, keep it lateral and run it over the biceps, over the shoulder and under the muscle to
join to the subclavian vein. You will most likely have to break off the strand and fake that it goes through the muscles of the chest. The vein you have created, that travels laterally and superficially along the arm is known as the cephalic vein. This vein is often visible when a bodybuilder flexes his/her biceps. cephalic vein. 4. Take the other end of the
strand that is hanging unattached and run this vein along the medial side of the arm. 5. Place the strand along the ulna and keep the strand dorsal. Before reaching the fold of the elbow, bring the
strand ventral and continue on the medial side of the humerus up into the axillary (armpit) region. 6. Connect this vessel, the basilic vein, with the subclavian vein in the neck. 7. Observe that the cephalic vein and the basilic vein travel
parallel to one another at the antecubital region, but do not touch. 8. Take a short piece of blue spaghetti and attach it to the cephalic just below the antecubital region and angle it upward so it attaches the basilic vein just above the antecubital region. 9. This represents the medial cubital vein, the vein often used for blood draws and IV sites. medial cubital vein
10. Use one of your tools or the tip of a pencil to form several V shaped valves in the veins. Make sure the tip of the V points upward to show that the valve points to the direction that the blood is moving. Valves are not very far apart so each vein you have built will have a valve approximately every centimeter. 11. Use thin strands of blue spaghetti to form the dorsal venous network of your models hand to resemble your
own. 12. Use small strand of blue clay to create small veins, or venules, that service the brachialis muscle. Arteries take blood to these muscles, but there must be a way to take blood away. Label the following veins on your worksheet Superior Vena Cava
Initially have one SEG per shop. After an IH program matures, break DSGs into a separate SEG. An IH program is mature when your BEE has enough quantitative data to articulate the different risk to FTEs and DSGs.
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