The Cardiac Cycle: From Diastole to SystoleĪs we alluded to above, step 4 involves the right ventricle.ĭuring diastole, the deoxygenated blood from the right atrium travels through the tricuspid valve and enters the right ventricle. Make sure to check out the below EZmed post on the cardiac cycle, where we discuss systole, diastole, and the changes in the pressure in heart during these phases! In doing so, the blood travels through the tricuspid valve located between the right atrium and right ventricle. The deoxygenated venous blood carried by the SVC and IVC enters the right atrium.ĭuring diastole, when the heart is relaxed and filling with blood, the deoxygenated blood from the right atrium will flow to the right ventricle.

Consider a ventricular contraction where there is a hole in the septum.Step 2 involves the right atrium, the first chamber of the heart in which the deoxygenated blood from the rest of the body enters. A ventricular septal defect occurs in some newborns where the septum (E) does not close completely during development. Based on your knowledge of the heart, describe what happens to the blood of someone who has this condition.Ĥ. Mitral regurgitation is a heart condition that occurs when the mitral valve does not close fully. Compare the direction of blood flow in the pulmonary artery to the pulmonary vein.ģ. Compare the location of the tricuspid and bicuspid.Ģ.

Red the descriptions carefully and trace the flow of bloon in the heart using arrows.ĭon't forget to LABEL the parts of the heart on the diagram!ġ. The aorta forms an arch as blood is routed to the lower part of the body where it oxygenates organs and muscles. Color the aorta dark red.īlood enters the aorta and will travel to the head and shoulders through three smaller arteries: the brachiocephalic (6a), the left common carotid (6b), and the left subclavian (6c). A powerful contraction of the left ventricle will send blood through the aortic valve (C) and into the largest artery of the body, the aorta (6).

Color the left atrium red.įrom the left atrium, blood goes through the bicuspid valve, which is also called the mitral valve (D) and enters the most muscular part of the heart, the left ventricle (4). Oxygenated blood returns from the lungs through the left and right pulmonary veins (9) which empties into the left atrium (3). Color the pumonary trunk and arteries light blue. This artery branches into two arteries, the left pulmonary artery (5L) and the right pulmonary artery (5R) which will deliver the blood to the lungs where it will become oxygenated. Color the right ventricle dark purple.įrom the right ventricle, blood is pushed out through the pulmonary valve (B) and into the pulmonary trunk (5). Color both dark blue.īlood then enters the right atrium (1) where a small contraction pushes blood through the tricuspid valve (A) and into the right ventricle (2). **For each of the numbers described below, LABEL on the heart diagram.**īlood that has traveled through the body supplying nutrients to tissues eventually returns to the heart through the superior vena cava (7) and the inferior vena cava (8). This means that as you look at the heart, the left side refers to the 'patient's' left side and not your left side. The heart has four chambers, and most diagrams will show the heart as it is viewed from the ventral side. Mammals and birds (and some reptiles) have what is known as a double-loop circulatory system, where blood leaves the heart, goes to the lungs where it becomes oxygenated and then returns to the heart before delivering the oxygenated blood to the rest of the body. The human heart is similar to the hearts of other vertebrates. Learn the Anatomy of the Heart (by Number)

Heart blood flow diagram