Chapter 17 - Cardiac Heart

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

aorta

The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the:

atria

Which hormone decreases cardiac output by decreasing blood volume and preload?

atrial natriuretic peptide (ANP)

Autorhythmicity in the heart is the responsibility of:

carciac pacemaker cells

The apex of the heart is:

inferior

What characteristic differentiates cardiac muscle cells from skeletal muscle cells?

intercalated discs

Unlike skeletal muscle action potentials, cardiac muscle action potentials __________________________.

involve calcium voltage-gated channels

Which of the following vessels carries oxygenated blood?

pulmonary vein

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

pulmonary veins

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

stroke volume (SV) and heart rate (HR)

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

system circuit

Which of the following happens immediately after P wave?

the atria contract

The aortic valve closes when ________________________________.

the pressure in the left ventricle falls below aortic pressure

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 aortic valve opens at:

B