I The Pulmonary and Syst Circuits p 659 Fig 181 A The lett o

I. The Pulmonary and Syst Circuits (p. 659; Fig. 18.1) A. The lett of the heart receives oxygen-poor blood returning from body tissues and side pumps it to the lungs to release and pick up blood from the lungs and pumps side of the heart receives 1. The it out to the body to supply oxygen to tissues. 2. The heart has two receiving chambers, the and two pumping chambers, IL Heart Anatomy (pp. 659-671; Figs. 18.2-18.11) A. Size, Location, and orientation (p. 65 Fig. 18.2) and weighs 250-300 grams. 1. The heart is the size of a 2. The heart is found in the mediastinum and two-thirds lies of the midsternal line. shoulder and the apex points toward the hip. 3. The base is directed toward the B. Coverings of the Heart (pp. 660-661; Fig. 18.3) 1. The heart is enclosed in a double-walled sac called the a. The superficial pericardium is the fibrous pericardium. What are its 3 functions? b. Deep to the fibrous pericard um is the serous pericardium, consisting of a parietal layer that lines the inside of the pericardium, and a visceral layer (epicardium) that covers the surface of the heart. 2. Between the visceral and parietal layers is the cavity, containing a film of serous fluid that lubricates their movement against each other. C. Layers of the Heart Wall (pp. 661-662; Figs. 18.3-184) 1. The epicardium is the visceral pericardium of the serous pericardium. 2. The hyp Cardium is composed mainly of cardiac muscle and forms the bulk of the heart. lines the chambers of the heart and is continuous with the 3. The endothelial linings of the vascular system. D. Chambers and Associated Great Vessels (p. 662; Fig. 18.5) 1. There are partitions that separate the heart longitudinally: the septum divides the atria, and between the ventricles lies the septum. 2. The right and left atria are the receiving chambers of the heart and only minimally contract te propel blood into the ventricles. a. Name the three veins that enter the right atrium and their function:

Solution

I (a) :- Since that blood is deoxygeneted, so it will release carbon dioxide and again pick oxygen from the lungs.

1. The right side of the heart receive oxygeneted blood from the lungs and pumps to the different parts of the body.

2. Receiving chambers, ATRIUM and the pumping chambers, VENTRICLES.

II. (A):- The heart is a size of like FIST.

(B) :- The two third of the heart lies in the left of the midsternal line.

(C) :- The base is directed towards the left shoulder and the apex points towards the left hip.

The heart is enclosed in a double walled sac called pericardium.