Chapter 15 part 2

What are the two closed circuits included in the Cardiovascular System?

• Pulmonary circuit and Systemic circuit

• Arteries and Veins

• Atria and Ventricles

• Heart and Blood Vessels

What is the function of the myocardium?

• Contracts to pump blood from the heart chambers

• Forms a protective outer covering

• Reduces friction

• Forms inner lining of all heart chambers

What are the three distinct layers of the heart wall?

• Epicardium, Myocardium, Endocardium

• Atria, Ventricles, Valves

• Arteries, Veins, Capillaries

• Fibrous, Parietal, Visceral

What is the role of the SA node in the heart?

• Controls the heart rate

• Pumps blood to the lungs

• Separates the left and right atria

• Prevents backflow of blood

What is the first heart sound (S1) associated with?

• Closing of the AV valves

• Closing of the pulmonary and aortic semilunar valves

• Atrial contraction

• Ventricular relaxation

What is the function of the tricuspid valve?

• Prevents blood from moving from the right ventricle into the right atrium during ventricular contraction

• Prevents blood from moving from the left ventricle into the left atrium during ventricular contraction

• Prevents blood from moving from the aorta into the left ventricle during ventricular relaxation

• Prevents blood from moving from the pulmonary trunk into the right ventricle during ventricular relaxation

What is the normal heart rate controlled by?

What is the definition of arrhythmias?