Question

defineee heart!!!!!!​

Answer 1

Answer:

The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.

Answer 2

Answer:

Heart is a hollow muscular organ that pumps the blood through the circulatory system by rythmic contraction and dilation. in vertebrates there may be up to four chambers ,(in humans), with two atria and two verticles.