The document discusses the cardiovascular system which has two divisions: the lymphatic system which returns tissue fluid to the bloodstream and filters tissue fluid without a pump, and the blood circulatory system. It then focuses on the heart, describing it as the major pumping structure of the circulatory system located in the thoracic cavity. The heart is enclosed in a sac called the pericardium and has an inner lining called the endocardium as well as chambers including the atrium and ventricle.

1. COLLEGE OF NURSING – ARAULLO UNIVERSITY
Cabanatuan City
ANATOMY PHYSIOLOGY HANDOUTS
CARDIOVASCULAR SYSTEM
2 divisions: Lymphatic
return the tissue fluid to the blood stream; filter the tissue fluid
no pump
thymus, spleen, tonsils, lymph nodes
Blood circulatory system
The Heart
major structure in circulatory system
pump for the blood
located in the thoracic cavity within the “mediastinum”
enclosed by sac called pericardium:
parietal – fibrous
visceral or epicardium – attached closely to the cardiac muscle or myocardium
endocardium – the heart’s lining; an endothelial tissue continuous with the blood vessels lining
atrium – thin walled chamber, smalles