Octopuses have three hearts. Two branchial hearts pump blood through each of the two gills, while the third is a systemic heart that pumps blood through the body. source
Octopuses have three hearts. Two branchial hearts pump blood through each of the two gills, while the third is a systemic heart that pumps blood through the body.
The heart of an elephant weighs 12–21 kg (26–46 lb). It has a double-pointed apex, an unusual trait among mammals.
When standing, the elephant's heart beats approximately 30 times per minute.
The heart rate speeds up by 8 to 10 beats per minute when the elephant is lying down.
The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. source
The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system.
Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. source
Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart.
In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. source
In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow.
The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. source
The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid.
The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. source
The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node. source
The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node.
These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart. source
These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart.
The heart beats at a resting rate close to 72 beats per minute. source
The heart beats at a resting rate close to 72 beats per minute.
Exercise temporarily increases the rate, but lowers resting heart rate in the long term, and is good for heart health. source
Exercise temporarily increases the rate, but lowers resting heart rate in the long term, and is good for heart health.
Diagnosis of heart disease is often done by the taking of a medical history, listening to the heart-sounds with a stethoscope, ECG, and ultrasound. source
Diagnosis of heart disease is often done by the taking of a medical history, listening to the heart-sounds with a stethoscope, ECG, and ultrasound.
Specialists who focus on diseases of the heart are called cardiologists, although many specialties of medicine may be involved in treatment. source
Specialists who focus on diseases of the heart are called cardiologists, although many specialties of medicine may be involved in treatment.
The human heart is situated in the middle mediastinum, at the level of thoracic vertebrae T5-T8. source
The human heart is situated in the middle mediastinum, at the level of thoracic vertebrae T5-T8.
The heart has four chambers, two upper atria, the receiving chambers, and two lower ventricles, the discharging chambers. source
The heart has four chambers, two upper atria, the receiving chambers, and two lower ventricles, the discharging chambers.
The heart has four valves, which separate its chambers. source
The heart has four valves, which separate its chambers.
The heart is divided into four chambers: upper left and right atria; and lower left and right ventricles. source
The heart is divided into four chambers: upper left and right atria; and lower left and right ventricles.
The heart functions as a pump in the circulatory system to provide a continuous flow of blood throughout the body. source
The heart functions as a pump in the circulatory system to provide a continuous flow of blood throughout the body.
The right heart collects deoxygenated blood from two large veins, the superior and inferior venae cavae. source
The right heart collects deoxygenated blood from two large veins, the superior and inferior venae cavae.