Heart diagram

The normal heart is a strong, hard-working pump made of muscle tissue. It's about the size of a person's fist. The heart has four chambers. The upper two chambers are the atria, and the lower two are the ventricles (Figure A). The chambers are separated by a wall of tissue called the septum. Blood is pumped through the chambers, aided by four heart valves. The valves open and close to let the blood flow in only one direction. Congenital defects may involve a valve, a chamber, the septum, an artery or blood flow issues. The four heart valves are: • the tricuspid valve, located between the right atrium and the right ventricle; • the pulmonary valve, between the right ventricle and the pulmonary artery; • the mitral valve, between the left atrium and left ventricle; and • the aortic valve, between the left ventricle and the Each valve has a set of "flaps" (also called leaflets or cusps). The mitral valve normally has two flaps; the others have three. Healthy heart blood flow patterns The normal blood flow is a cycle that flows like this; body-heart-lungs-heart-body. Next we will look at each step. From the body to the heart. Figure B below shows dark bluish blood, low in oxygen, flowing back to the heart after circulating through the body. It returns to the heart through veins and enters the right atrium. This chamber empties blood through the tricuspid valve (B) into the right ventricle. From the heart to the lungs The right ventricle pumps the blood under low pressure throu...

The heart is a hollow, muscular organ that pumps oxygenated blood throughout the body and deoxygenated blood to the lungs. This key circulatory system structure is comprised of four chambers. One chamber on the right receives blood with waste (from the body) and another chamber pumps it out toward the lungs where the waste is exhaled. One chamber on the left receives oxygen-rich blood from the lungs and another pumps that nutrient-rich blood into the body. Two valves control blood flow within the heart’s chambers, and two valves control blood flow out of the heart. 1. The Heart Wall Is Composed of Three Layers The muscular wall of the heart has three layers. The outermost layer is the epicardium (or visceral pericardium). The epicardium covers the heart, wraps around the roots of the great blood vessels, and adheres the heart wall to a protective sac. The middle layer is the myocardium. This strong muscle tissue powers the heart’s pumping action. The innermost layer, the endocardium, lines the interior structures of the heart. 2. The Atria Are the Heart’s Entryways for Blood The left atrium and right atrium are the two upper chambers of the heart. The left atrium receives oxygenated blood from the lungs. The right atrium receives deoxygenated blood returning from other parts of the body. Valves connect the atria to the ventricles, the lower chambers. Each atrium empties into the corresponding ventricle below. 3. Each Heart Beat Is a Squeeze of Two Chambers Called Ventricle...

Anatomy of the Heart Welcome to the anatomy of the heart made easy! We will use labeled diagrams and pictures to learn the main cardiac structures and related vascular system. In addition to reviewing the human heart anatomy, we will also discuss the function and order in which blood flows through the heart. By the end of this post, you will have a strong understanding of the main cardiac structures including: • Atria • Ventricles • Tricuspid Valve • Mitral Valve • Pulmonary Valve • Aortic Valve • Superior and Inferior Vena Cava • Pulmonary Arteries and Veins • Aorta You will also be provided with numerous memory tricks to help you remember the different structures of the heart! Make sure to check out the blank model of the heart at the end of this post, and quiz yourself on the gross anatomy by labeling and matching the main cardiac structures! By the end of this post, you will be able to label a drawing of the heart similar to the anterior view (frontal section) shown below. Let’s get started! Heart Chambers - Atria and Ventricles As we walk through the main anatomical structures of the heart, here are some other EZmed references you may find useful to help bring it all together! The Cardiac Cycle - Step-By-Step Guide of the Heart Cycle from Diastole to Systole Conduction System of the Heart - Step-By-Step Guide of the Conduction System Now let’s really get started! Chambers of the Heart Let's begin with the chambers of the heart. There are 4 chambers, labeled 1-4 on the...

Day after day, your heart beats about 100,000 times, pumping 2,000 gallons of blood through 60,000 miles of blood vessels. If one of your organs is working that hard, it makes sense to learn about how it functions! This science quiz game will help you identify the parts of the human heart with ease. Blood comes in through veins and exists via arteries—to control the direction of the flow, the heart has four sets of valves. The heart is an amazing machine with a lot of moving parts—let this quiz game help you find your way around this most vital of organs.

Blood flows through your heart, lungs and body in a series of steps. After delivering oxygen and nutrients to all your organs and tissues, your blood enters your heart and flows to your lungs to gain oxygen and get rid of waste. It then flows back to your heart, which pumps the refreshed blood out through your aorta to nourish your body again. What is the role of blood flow through the heart and body? You need continuous blood flow through your heart and body to stay alive. Your • It delivers oxygen and nutrients to all your organs and tissues. • It removes carbon dioxide and other waste products from those same places. The blood then returns to your heart once it’s low on oxygen and full of waste products. It needs to get filled with oxygen and get rid of carbon dioxide so your heart pumps it out to blood vessels in your In addition to its role in delivering oxygen and nutrients, blood also contains infection-fighting cells called white blood cells. White blood cells are crucial in protecting the body from infection. Your white blood cells circulate throughout your body and respond to infections and foreign materials. This circulation of blood continues over and over, every second of every day. Your heart and blood vessels make it all happen, and that’s why together they’re known as your Blockages in your blood vessels (like Where does blood flow through the heart? Your heart has four Like returning home after a long day at work, your blood returns to your heart after cir...