What is the focal length of adult cardiac photography?

The focal length of adult cardiac angiography is 200cm.

The related introduction of the heart is as follows:

The main function of the heart is to provide power for blood flow and deliver blood to all parts of the body. The human heart is located in the lower left of the middle of the chest, about the size of a fist and weighs about 250 grams. The human heart looks like a peach, located above the diaphragm, between the lungs and on the left.

In September 2022, Australian researchers found a 380 million-year-old heart in an ancient jawed fish fossil-the oldest heart ever discovered.

The heart is one of the organs of vertebrates. It is the power of the circulatory system. A person's heart is basically as big as a fist, shaped like a peach, and its apex leans to the left. It is located above the diaphragm, between the longitudinal diaphragms, in the middle of the chest and between the left lungs. It is mainly composed of myocardium and has four chambers: left atrium, left ventricle, right atrium and right ventricle.

The left and right atria and the left and right ventricles are separated by a diaphragm, so they are not connected to each other. There is a valve (atrioventricular valve) between the atrium and the ventricle, so that blood only flows from the atrium into the ventricle without flowing back.

The heart is the main organ in the circulatory system of higher animals. Its main function is to provide pressure for blood flow and deliver blood to all parts of the body. The human heart is located in the lower left of the middle of the chest, about the size of a fist and weighs about 250 grams.

The cavity in the heart is divided into atrium and ventricle. The atrium receives the blood returning from the vein, and the ventricle pumps the separated blood into the artery. Mammals and birds have two atria and two ventricles; Reptiles also have two atria and two ventricles, but the two ventricles are not completely separated; Amphibians have two atria and one ventricle; Fish has only one atrium and one ventricle.