Yes, a butterflies has a heart.
The butterfly's heart runs the length of its upper body.
(http://home.vicnet.net.au/~fbpw/but_fly1.htm)
The heart pumps hemolymph (it lacks the red colour of blood) from the rear of the insect forward to bathe its internal organs.
(http://www.kidsbutterfly.org/faq/general/13)
The dog's circulatory system is quite similar to that of humans. The heart has four chambers. The two upper chambers are the left and right atria, while the stronger, lower chambers are the right and left ventricles.
The innermost layer of the heart that is in contact with the blood flowing through its chambers is the endocardium. This layer is a thin membrane that lines the inner surface of the heart chambers and valves, helping to regulate blood flow and prevent clot formation within the heart.
Systole refers to the phase of the heartbeat when the heart muscle contracts and blood is pushed out of the heart chambers. Diastole refers to the phase when the heart muscle relaxes and the heart chambers fill with blood.
The scientific term for the contraction of the heart is "systole." This is when the heart muscle contracts to pump blood out of the heart's chambers and into the circulatory system.
The mitral valve or the tricuspid valve separates the upper and lower chambers of the heart. These valves control the flow of blood between the atria and ventricles, ensuring that blood moves in the correct direction within the heart. Dysfunction of these valves can lead to various heart conditions.
There are 4 chambers to the heart.
Their are 2 heart chambers.
A shark heart has two chambers.
The bird's heart has 4 chambers.
A sheep heart has four chambers.
There are 4 chambers in a bird's heart.
There are four chambers in a human heart.
there are four chambers!
A reindeer, being a mammal, has four heart chambers.
There's 4 heart chambers in a human, which is a mammle
The human heart has four chambers. The atria are the upper chambers, and the ventricles are the lower chambers.
the human heart contains four chambers and it is the ventricles (the two lower chambers) that do the pumping