Lab Quiz: 3

The ----, a cone-shaped organ approximately the size of a -----, is located within the mediastinum of the thorax.

It's more pointed -------- extends slightly to the left and rests on the diaphragm, approximately at the level of the fifth intercoastal space.

Its broader -----, from which the great vessels emerge, lies beneath the second rib and points toward the right shoulder.

The loose-fitting superficial part of the sac is the ------------ ---------

Deep to it is the ---------- ----------, which lines the internal surface of the fibrous pericardium as the ------ --------.

The ---------- is an integral part of the heart wall.

-----------: The outer layer, which is also the visceral pericardium

------------: The middle layer and thickest layer, which is composed mainly of cardiac muscle. It is reinforced with dense fibrous connective tissue, the cardiac skeleton, which is thicker around the heart valves and at the base of the great vessels leaving the heart.

------------: The inner lining of the heart, which covers the heart valves and is continuous with the inner lining of the great vessels. It is composed of simple squamous epithelium resting on areolar connective tissue.

The heart is divided into ----- chambers: two superior -------, and two inferior -------.

The septum that divides the heart longitudinally is referred to as the ------------ ----- where it separates the atria, and the ------------ -------- where it separates the ventricles.

The atria are receiving chambers and are relatively ------------ as pumps.

Four -------- enforce a ----way blood flow through the heart chambers.

The atrioventricular (--) valves are located between the atrium and the ventricle on the left and right side of the heart.

-------- --------: The right AV valve has three flaplike cusps anchored to the --------- ---------- of the ventricular wall by tiny, white collagenic cords called ---------- ---------.

Mitral valve (---------- --------): The left AV valve has two flaplike cusps anchored to the pupillary muscles by chordae tendineae.

The semilunar (--) valves are located between a ventricle and a great vessel.

----------- -----: has three pocketlike cusps located between the right ventricle and the pulmonary trunk.

---------- --------: has three pocketlike cusps located between the left ventricle and the aorta.

The major function of the ---------- --------- is --------.

The right side of the heart pumps ---------- blood.

The left side of the heart pumps ------------- blood.

The function of the pulmonary circuit is strictly to provide for ----- -----------