It is located in the thoracic cavity medial to the      ventricle of the heart are the pumping
lungs and posterior to the sternum.                     chambers for the systemic circulation loop.
The bottom tip of the heart, known as its apex,         LYMPHATIC             SYSTEM       or   Immune
is turned to the left, so that about 2/3 of the         System
heart is located on the body’s left side with the
other 1/3 on right.                                         It is a network of tissues and organs that
                                                             help rid the body of toxins, waste and
The top of the heart, known as the heart’s                   other unwanted materials.
base, connects to the great blood vessels of the            It is our body’s defense system against
body: the aorta, vena cava, pulmonary                        infectious pathogenic viruses, bacteria,
trunk, and pulmonary veins.                                  and fungi as well as parasitic animals and
                                                            The primary function of the lymphatic
                                                             system is to transport lymph, a fluid
                                                             containing infection-fighting white blood
                                                             cells, throughout the body.
                                                            The lymphatic system primarily consists
                                                             of lymphatic vessels, which are similar to
                                                             the circulatory system"s veins and
                                                             capillaries. The vessels are connected to
                                                             lymph nodes, where the lymph is filtered.
                                                             The tonsils, adenoids, spleen and thymus
                                                             are all part of the lymphatic system.
                                                        Red Bone Marrow
Circulatory Loops                                           It is a highly vascular tissue found in the
                                                             spaces between trabeculae of spongy bone.
The pulmonary circulation loop and the
                                                            It is mostly found in the ends of long
systemic circulation loop are 2 primary
                                                             bones and in the flat bones of the body.
circulatory loops in the human body.
                                                            It is a hematopoietic tissue containing
Pulmonary            circulation        transports           many stem cells that produce blood cells.
deoxygenated blood from the right side of the
                                                        Lymph Capillaries
heart to the lungs, where the blood picks up
oxygen and returns to the left side of the heart.       As blood passes through the tissues of the
The pumping chambers of the heart that                  body, it enters thin-walled capillaries to
support the pulmonary circulation loop are the          facilitate diffusion of nutrients, gases, and
right atrium and right ventricle.                       wastes. Blood plasma also diffuses through the
                                                        thin capillary walls and penetrates into the
Systemic        circulation     carries     highly
                                                        spaces between the cells of the tissues.
oxygenated blood from the left side of the
heart to all of the tissues of the body (with the       Lymph
exception of the heart and lungs). Systemic
circulation removes wastes from body tissues                The interstitial fluid picked up by
and returns deoxygenated blood to the right                  lymphatic capillaries is known as lymph.
side of the heart. The left atrium and left                 It is very closely resembles the plasma
                                                             found in the veins: it is a mixture of about