The+Cardiac+Activity

As for the cardiac activity: Deoxygenated blood (from the body - thus lacking oxygen) is pumped through the right atrium and the right ventricle (to the lungs), while oxygenated blood (from the lungs, thus carrying the oxygen) is pumped through the left atrium and the left ventricle (to the body). Deoxygenated blood enters the right atrium from the Superior vena cava and the Inferior vena cava. Deoxygenated blood leaves the right ventricle by Pulmonary artery, which takes blood to the lungs via the right and left branches of the pulmonary artery. Oxygenated blood enters the left atrium from the Pulmonary veins. These may be labeled as "right pulmonary veins" and "left pulmonary veins".Oxygenated blood leaves the left ventricle by ascending aorta, which takes blood to the body via its system of arteries, arterioles, and capillaries. Major arteries leading from the heart (via the ascending aorta) include the brachiocephalic artery, the left common carotid artery, and the left sub-clavian artery. These are just a few of the main arteries of the body. It is essential that blood flows in the correct direction through the heart so the structure of the heart includes a series of valves. The Tricuspid valve separates the right atrium from the right ventricle. The Pulmonic / Pulmonary valve separates the right ventricle from the pulmonary artery. The Mitral (known as the Bicuspid) valve separates the left atrium from the left ventricle. The Aortic valve separates the right ventricle from the ascending aorta. To have a clearer image and understanding, this link shows us exactly how our hearts are structured and the direction of the blood flow:[]

 References:


 *  The Structure Of The Heart. [video]. (2008). Retrieved May, 27, 2011, from []
 *  IvyRose Holistic.(2011).The Structure of the Heart. Retrieved May, 27, 2011, from: []
 *  Abou Lebdeh, D., Dakroub, R., Abboud Seif, N., & Geries Jarjour, Z. (2000). //Life and earth science//. Sin-El-Fil, Lebanon: Lebanese Educational Publishing Company.
 *  //Bupa.// (2011). //Cardiovascular system.// Retrieved May, 27, 2011, from []

   **Questions to research – cardiac activity:** **Leen:**
 * 1) What are the three phases of the cardiac cycle?
 * 2) What is the total duration of the cardiac cycle?
 * 3) Describe the pathway of the blood flow in the heart, and the role played by each component in the heart.

**1) Diastole, Atrial Systole, Ventricular Systole**

**2) 0.8 seconds**

**3) Deoxygenated blood (from the body - thus lacking oxygen) is pumped through the right atrium and the right ventricle (to the lungs), while oxygenated blood (from the lungs, thus carrying the oxygen) is pumped through the left atrium and the left ventricle (to the body). **  **Deoxygenated blood enters the right atrium from the Superior vena cava and the Inferior vena cava. ****Deoxygenated blood leaves the right ventricle by Pulmonary artery, which takes blood to the lungs via the right and left branches of the pulmonary artery. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Oxygenated blood enters the left atrium from the Pulmonary veins. These may be labeled as "right pulmonary veins" and "left pulmonary veins". ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Oxygenated blood leaves the left ventricle by ascending aorta, which takes blood to the body via its system of arteries, arterioles, and capillaries. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Major arteries leading from the heart (via the ascending aorta) include the brachiocephalic artery, the left common carotid artery, and the left sub-clavian artery. These are just a few ** **<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">of the main arteries of the body. ** <span style="color: #ff00ff; display: block; font-family: 'Trebuchet MS',sans-serif; line-height: 14px; margin: 0in 0in 10pt;">**[Dalia]** **1) The 3 phases are: Diastole, Atrial Systole, Ventricular Systole**

**2) On average in a healthy human: 0.8 seconds**

**3)** <span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">**Deoxygenated blood is pumped through the right atrium and the right ventricle (to the lungs), while oxygenated blood (from the lungs, thus carrying the oxygen) is pumped through the left atrium and the left ventricle to the body.** **<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Deoxygenated blood enters the right atrium from the Superior vena cava and the Inferior vena cava. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Deoxygenated blood leaves the right ventricle by Pulmonary artery, which takes blood to the lungs via the right and left branches of the pulmonary artery. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Oxygenated blood enters the left atrium from the Pulmonary veins. These may be labeled as "right pulmonary veins" and "left pulmonary veins." ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Oxygenated blood leaves the left ventricle by ascending aorta, which takes blood to the body via its system of arteries, arterioles, and capillaries. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: small; line-height: 14px;">Major arteries leading from the heart (via the ascending aorta) include the brachiocephalic artery, the left common carotid artery, and the left sub-clavian artery.... AND THAT'S HOW BLOOD CIRCULATES THROUGH THE HEART, YAY! **