Unit 1 – Anatomy
Assignment 3 – Cardiovascular System
, Labelled diagram of the heart
The heart has four chambers, the left and right atrium, and the left and right ventricles. The
walls of the heart are made up of three layers.
Endocardium – this is the innermost layer of heart tissue; therefore it lines the cavities & the
chambers of the heart. It is composed of loose connective tissue and simple squamous epithelial
tissue. The Endocardium regulates the contractions of the heart, aids cardiac development, and
may regulate the composition of the blood that feeds the tissues of the heart.
Myocardium - this is composed of cardiac muscle and is located between the Epicardium and
Endocardium. It is responsible for the contractions of the heart, which occur without conscious
thought. These contractions allow blood to enter the atria and pump blood out of the ventricles.
Epicardium – this layer is located on the outside of the heart. A continuous piece of muscle, this
tissue performs a protective role, helping hold the other muscles close together. The heart is
responsible for pumping blood through the blood vessels, causing it to circulate throughout the
body.
Superior Vena Cava
Aorta
Right Pulmonary Veins
Pulmonary Artery
Right atrium
Left Pulmonary Veins
Left atrium
Pulmonary Valve
Bicuspid Valve
Tricuspid Valve Aortic valve
Chord Tendineae
Endocardium
Myocardium Left ventricle
Epicardium
Septum
Inferior Vena Cava
Right ventricle
Aorta
Assignment 3 – Cardiovascular System
, Labelled diagram of the heart
The heart has four chambers, the left and right atrium, and the left and right ventricles. The
walls of the heart are made up of three layers.
Endocardium – this is the innermost layer of heart tissue; therefore it lines the cavities & the
chambers of the heart. It is composed of loose connective tissue and simple squamous epithelial
tissue. The Endocardium regulates the contractions of the heart, aids cardiac development, and
may regulate the composition of the blood that feeds the tissues of the heart.
Myocardium - this is composed of cardiac muscle and is located between the Epicardium and
Endocardium. It is responsible for the contractions of the heart, which occur without conscious
thought. These contractions allow blood to enter the atria and pump blood out of the ventricles.
Epicardium – this layer is located on the outside of the heart. A continuous piece of muscle, this
tissue performs a protective role, helping hold the other muscles close together. The heart is
responsible for pumping blood through the blood vessels, causing it to circulate throughout the
body.
Superior Vena Cava
Aorta
Right Pulmonary Veins
Pulmonary Artery
Right atrium
Left Pulmonary Veins
Left atrium
Pulmonary Valve
Bicuspid Valve
Tricuspid Valve Aortic valve
Chord Tendineae
Endocardium
Myocardium Left ventricle
Epicardium
Septum
Inferior Vena Cava
Right ventricle
Aorta
