● `color{violet}("Human circulatory system,")` also called the `color{violet}("blood vascular system")` consists of a `color{violet}("muscular chambered heart")`, a network of `color{violet}("closed branching blood vessels")` and blood, the fluid which is circulated.
● `color{brown}("Heart, the mesodermally derived organ")`, is situated in the `color{violet}("thoracic cavity,")` in between the two `color{violet}("lungs, slightly tilted to the left.")`
● It has the size of a `color{violet}("clenched fist.")`
● It is protected by a double walled membranous bag, `color{brown}("pericardium")`, enclosing the `color{violet}("pericardial fluid.")`
● Our heart has four chambers, two relatively small upper chambers called `color{brown}("atria")` and two larger lower chambers called `color{brown}("ventricles.")`
● A `color{violet}("thin, muscular wall")` called the `color{brown}("interatrial septum")` separates the right and the left atria, whereas a thick-walled, the `color{brown}("inter-ventricular septum,")` separates the left and the right ventricles.
● The `color{violet}("atrium")` and the `color{violet}("ventricle")` of the same side are also separated by a thick `color{violet}("fibrous tissue")` called the `color{brown}("atrio-ventricular septum.")`
● `color{violet}("Human circulatory system,")` also called the `color{violet}("blood vascular system")` consists of a `color{violet}("muscular chambered heart")`, a network of `color{violet}("closed branching blood vessels")` and blood, the fluid which is circulated.
● `color{brown}("Heart, the mesodermally derived organ")`, is situated in the `color{violet}("thoracic cavity,")` in between the two `color{violet}("lungs, slightly tilted to the left.")`
● It has the size of a `color{violet}("clenched fist.")`
● It is protected by a double walled membranous bag, `color{brown}("pericardium")`, enclosing the `color{violet}("pericardial fluid.")`
● Our heart has four chambers, two relatively small upper chambers called `color{brown}("atria")` and two larger lower chambers called `color{brown}("ventricles.")`
● A `color{violet}("thin, muscular wall")` called the `color{brown}("interatrial septum")` separates the right and the left atria, whereas a thick-walled, the `color{brown}("inter-ventricular septum,")` separates the left and the right ventricles.
● The `color{violet}("atrium")` and the `color{violet}("ventricle")` of the same side are also separated by a thick `color{violet}("fibrous tissue")` called the `color{brown}("atrio-ventricular septum.")`