Chapter 17: The Heart a+p

What vessel delivers oxygenated blood to systemic capillaries for gas exchange?

Aotra

The P wave of a ECG represents the depolarization of cells in the ________.

Atria

Autorhythmicity in the heart if the responsibility of:

Cardiac pacemaker cells

What largely determines preload?

End diastolic volume

What characteristic differentiates cardiac muscle cells from skeletal muscle cells?

Intercalated discs

What surface groove separates right and left ventricles?

Interventricular sulcus

The pulmonary circuit involves blood flow from the heart to the _____?

Lungs

What vessel(s) deliver oxygenated blood into the left atrium?

Pulmonary Veins

What vessel carries oxygenated blood?

Pulmonary vein

What normally serves as the pace maker of the entire heart?

Sinoatrial (SA) node

What two valves are needed in order to calculate cardiac output (CO) for ventricle?

Stroke volume and heart rate

The vessels that deliver oxygen to the tissues of the body are part of the _________.

Systemic circuit

What happens immediately after the P wave?

The atria contract

Which event will immediately follow the phase of the cardiac cycle depicted in the figure?

The atrioventricular valves open

What is afterload?

The force the ventricles must overcome to elect blood into their respective arteries.

The right side of the heart pumps deoxygenated blood into ________.

The pulmonary vein

What wave prevents the backflow of blood from the right ventricle into the right atrium?

Tricuspid valve

Blood from the systemic circuit returns to the heart via the _________.

Venae cavae

During what phase does blood flow from the ventricles into the pulmonary trunk and aorta?

Ventricular ejection phase

The apex of the heart is _______.

inferior

The aortic valve closes when _________.

pressure in the left ventricle falls below aortic pressure