The right side of the heart maintains pulmonary circulation to the nearby lungs while the left side of the heart pumps blood all the way to the extremities of the body in the systemic circulatory loop. The heart functions by pumping blood both to the lungs and to the systems of the body
.
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
The heart is a muscular organ in humans and other animals, which pumps blood through the blood
vessels of the circulatory system.[1]Blood provides the body with oxygen and nutrients, as well as assists in the removal of metabolic wastes.[2] In humans, the heart is located between the lungs, in the middle compartment of the chest.[3]
Physiology. The heart is the muscular organ of the circulatory system that constantly pumps blood throughout the body. ... The atrium then delivers blood to the powerful lower chamber, called a ventricle, which pumps blood away from theheart through powerful, rhythmic contractions.
Cardiac output (CO) is a measurement of the amount of blood pumped by each ventricle (stroke volume) in one minute. ... Preload can also be affected by a person's blood volume. The force of each contraction of the heart muscle is proportional to the preload, described as the Frank-Starling mechanism.
The chambers of the heart together make it work as a double pump. Oxygen rich blood flows from the lungs to the left atrium. It is then pumped out to the rest of your body from the left ventricle. Meanwhile, the de-oxygenated blood enters the heartthrough the right atrium.
Four valves regulate blood flow through your heart: The tricuspid valve regulates blood flow between the right atrium and right ventricle. The pulmonary valve controls blood flow from the right ventricle into the pulmonary arteries, which carry blood to your lungs to pick up oxygen.
The blood provides your body with the oxygen and nutrients it needs. It also carries away waste. Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs.
How the heart works, and how it can cause sudden death
The heart is a specialised muscle that contracts regularly and continuously, pumping blood to the body and the lungs. The pumping action is caused by a flow of electricity through the heart that repeats itself in a cycle. If this electrical activity is disrupted – for example by a disturbance in the heart’s rhythm known as an ‘arrhythmia’ – it can affect the heart’s ability to pump properly.
How the heart functions electrically
The heart’s natural pacemaker – the SA node – sends out regular electrical impulses from the top chamber (the atrium) causing it to contract and pump blood into the bottom chamber (the ventricle). The electrical impulse is then conducted to the ventricles through a form of ‘junction box’ called the AV node. The impulse spreads into the ventricles, causing the muscle to contract and to pump out the blood. The blood from the right ventricle goes to the lungs, and the blood from the left ventricle goes to the body
The heart has four chambers – two at the top (the atria) and two at the bottom (the ventricles). The normal trigger for the heart to contract arises from the heart’s natural pacemaker, the SA node, which is in the top chamber (see the diagram, right). The SA node sends out regular electrical impulses causing the atrium to contract and to pump blood into the bottom chamber (the ventricle). The electrical impulse then passes to the ventricles through a form of ‘junction box’ called the AV node (atrio-ventricular node). This electrical impulse spreads into the ventricles, causing the muscle to contract and to pump blood to the lungs and the body. Chemicals which circulate in the blood, and which are released by the nerves that regulate the heart, alter the speed of the pacemaker and the force of the pumping action of the ventricles. For example, adrenaline increases the heart rate and the volume of blood pumped by the heart.
A death is described as sudden when it occurs unexpectedly, spontaneously and/or even dramatically. Some will be unwitnessed; some may occur during sleep or during or just after exercise. Most sudden deaths are due to a heart condition and are then called sudden cardiac death (SCD). Up to 95 in every 100 sudden cardiac deaths are due to disease that causes abnormality of the structure of the heart. The actual mechanism of death is most commonly a serious disturbance of the heart’s rhythm known as a ‘ventricular arrhythmia’ (a disturbance in the heart rhythm in the ventricles) or ‘ventricular tachycardia’ (a rapid heart rate in the ventricles). This can disrupt the ability of the ventricles to pump blood effectively to the body and can cause a loss of all blood pressure. This is known as a cardiac arrest. If this problem is not resolved in about two minutes, and if no-one is available to begin resuscitation, the brain and heart become significantly damaged and death follows quickly.
.
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
The heart is a muscular organ in humans and other animals, which pumps blood through the blood
vessels of the circulatory system.[1]Blood provides the body with oxygen and nutrients, as well as assists in the removal of metabolic wastes.[2] In humans, the heart is located between the lungs, in the middle compartment of the chest.[3]
Physiology. The heart is the muscular organ of the circulatory system that constantly pumps blood throughout the body. ... The atrium then delivers blood to the powerful lower chamber, called a ventricle, which pumps blood away from theheart through powerful, rhythmic contractions.
Cardiac output (CO) is a measurement of the amount of blood pumped by each ventricle (stroke volume) in one minute. ... Preload can also be affected by a person's blood volume. The force of each contraction of the heart muscle is proportional to the preload, described as the Frank-Starling mechanism.
The chambers of the heart together make it work as a double pump. Oxygen rich blood flows from the lungs to the left atrium. It is then pumped out to the rest of your body from the left ventricle. Meanwhile, the de-oxygenated blood enters the heartthrough the right atrium.Four valves regulate blood flow through your heart: The tricuspid valve regulates blood flow between the right atrium and right ventricle. The pulmonary valve controls blood flow from the right ventricle into the pulmonary arteries, which carry blood to your lungs to pick up oxygen.
The blood provides your body with the oxygen and nutrients it needs. It also carries away waste. Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs.
How the heart works, and how it can cause sudden death
The heart is a specialised muscle that contracts regularly and continuously, pumping blood to the body and the lungs. The pumping action is caused by a flow of electricity through the heart that repeats itself in a cycle. If this electrical activity is disrupted – for example by a disturbance in the heart’s rhythm known as an ‘arrhythmia’ – it can affect the heart’s ability to pump properly.
How the heart functions electrically
The heart’s natural pacemaker – the SA node – sends out regular electrical impulses from the top chamber (the atrium) causing it to contract and pump blood into the bottom chamber (the ventricle). The electrical impulse is then conducted to the ventricles through a form of ‘junction box’ called the AV node. The impulse spreads into the ventricles, causing the muscle to contract and to pump out the blood. The blood from the right ventricle goes to the lungs, and the blood from the left ventricle goes to the body
The heart has four chambers – two at the top (the atria) and two at the bottom (the ventricles). The normal trigger for the heart to contract arises from the heart’s natural pacemaker, the SA node, which is in the top chamber (see the diagram, right). The SA node sends out regular electrical impulses causing the atrium to contract and to pump blood into the bottom chamber (the ventricle). The electrical impulse then passes to the ventricles through a form of ‘junction box’ called the AV node (atrio-ventricular node). This electrical impulse spreads into the ventricles, causing the muscle to contract and to pump blood to the lungs and the body. Chemicals which circulate in the blood, and which are released by the nerves that regulate the heart, alter the speed of the pacemaker and the force of the pumping action of the ventricles. For example, adrenaline increases the heart rate and the volume of blood pumped by the heart.
A death is described as sudden when it occurs unexpectedly, spontaneously and/or even dramatically. Some will be unwitnessed; some may occur during sleep or during or just after exercise. Most sudden deaths are due to a heart condition and are then called sudden cardiac death (SCD). Up to 95 in every 100 sudden cardiac deaths are due to disease that causes abnormality of the structure of the heart. The actual mechanism of death is most commonly a serious disturbance of the heart’s rhythm known as a ‘ventricular arrhythmia’ (a disturbance in the heart rhythm in the ventricles) or ‘ventricular tachycardia’ (a rapid heart rate in the ventricles). This can disrupt the ability of the ventricles to pump blood effectively to the body and can cause a loss of all blood pressure. This is known as a cardiac arrest. If this problem is not resolved in about two minutes, and if no-one is available to begin resuscitation, the brain and heart become significantly damaged and death follows quickly.