Question

___________Deoxygenated________________blood enters the heart from the superior and

inferior _____________________________________. It enters the first of four chambers,
called the ______________________________________. The top of the first chamber is home
of the heart’s natural pacemaker, the ________________________ node. Blood then passes
through first of two atrioventricular valves called the __________________ valve into the
____________________________ (chamber) during a momentary relaxed period of the cardiac
cycle called _______________. From there, it passes through the
__________________________________ valve and enters the
______________________________ artery. After becoming oxygenated in the
_______________, blood returns via the _______________________ veins and enters the
__________________________. Blood is squeezed downward through the second
atrioventricular valve called the _______________________ valve where it enters the
___________________________________. It is pumped during __________________ out
through the _________________________ valve into the ascending _____aorta___________.

Answer 1

The heart has four chambers: two atria and two ventricles. Deoxygenated blood flows into the heart through the superior and inferior vena cava and passes through the atria and ventricles to be pumped to the lungs and the rest of the body. Oxygenated blood returns to the heart and is pumped through the aorta.

Step-by-step explanation:

The heart is divided into four chambers: two atria and two ventricles. Deoxygenated blood enters the heart from the superior and inferior vena cava and flows into the right atrium. It then passes through the tricuspid valve into the right ventricle. From the right ventricle, the blood is pumped through the pulmonary valve into the pulmonary artery and sent to the lungs to be oxygenated.

Oxygenated blood returns to the heart via the pulmonary veins and enters the left atrium. It then passes through the mitral valve into the left ventricle. From the left ventricle, the blood is pumped through the aortic valve into the aorta and distributed to the rest of the body.