Med Term Chapter 3 Review A

The tough, fibrous external layer of the membrane covering the heart is called the _

Pericardium

The outer surface of the heart itself is covered with a layer called the _

Epicardium

The muscle of the heart is called the _

Myocardium

The chambers of the heart are lined with a layer called the _

Endocardium

The two thin-walled receiving chambers of the heart are the _

Artia

The thicker-walled chambers into which they feed are called _

Ventricles

The left atrioventricular valve is called the _ valve

Mitral (Bicuspid)

The right atrioventricular valve is called the _ valve

Tricuspid

Backflow of blood from the arteries to the ventricles is prevented by the _valves

Semilunar

The pacemaker of the heart is also called the _ node

Sinoatrial (SA)

It produces electrical impulses that spread to the _ node

Atrioventricular (AV)

They also go through the _ fibers to stimulate contraction of the ventricles

Purkinje

Heart rate is influenced by two branches of the _ nervous system

Autonomic

The _ division slows heart rate.

Parasympathetic

The _ division increases heart rate

Sympathetic

Small arteries are called _

Arterioles

Small veins are called _

Venules

The tiny vessels that connect them are called _

Capillaries