Intro to the Heart

Question 1

Outline the blood flow of the heart.

Answer 1

Blood enters the right atrium of the heart through the vena cava and then passes through the tricuspid valve into the right ventricle. It is then ejected through the pulmonary valve and the pulmonary artery into the lungs. Blood enters the left atrium of the heart through the pulmonary veins and then passes through the mitral valve into the left ventricle (left ventricle). It is then ejected through the aortic valve and the aorta into the body.

Question 2

Heart Valves

Answer 2

The aortic and the pulmonary valves are collectively known as the semilunar valves. They are located between the ventricles and the major outflow vessels; aorta and pulmonary artery.

The mitral (bicuspid) and tricuspid valves are collectively known as the atrioventricular valves. They are located between the atria and the ventricles. The mitral valve is in the left ventricle and the tricuspid valve in the right ventricle.

Question 3

The name of the tracts (labelled B) that transmit the electrical signal along the myocardium of the atria.

Answer 3

Internodal/ interatrial tracts

Question 4

The primary pacemaking signal is generated at this node, which is located in the upper wall of the right atrium.

Answer 4

Sinoatrial Node

Question 5

Electrical activation of these fibers results in contraction of the ventricles.

Answer 5

Purkinje

Question 6

Transmission through this node corresponds to the P-R interval in the electrocardiogram (ECG)

Answer 6

Atrioventricular node