• National University

• DHA 201A

Exercise 30 lab

*The heart is located in a subdivision of the thorax called the MEDIASTINUM.

*The pericardial sac that encloses the heart is a two-layered structure. The outer layer is the fibrous

pericardium.

*How many chambers make up the human heart? 4.

*The major pumping chambers of the heart are BOTH VENTRICLES.

*The shapes and the thickness of the walls of the right ventricle compared to the left are different: L

ventricle is egg-shaped (round in cross section) with thicker walls.

*The mitral valve is located between the left atrium and left ventricle.

*What is true of the semilunar valves? They lie between ventricles and the large arteries that leave

the ventricles on each side of the heart.

*What is true about heart valves? They enforce a one-way blood flow through the heart, operate

passively (no active contraction required), and separate atria from ventricles, and ventricles from

the large arteries that leave them.

*Which side of the heart receives blood from the body and pumps it to the lungs? RIGHT.

*The atrioventricular (AV) heart valves open and close passively, depending on the pressure of the

blood in the atria and ventricles.

*This structure is a remnant of a fetal vessel that connected the pulmonary trunk and the aorta.

ligamentum arteriosum.

*CHORDAE TENDINEAE is/are found in the ventricles, and attach the flaps of the AV valves to papillary

muscle.

*The MODERATOR BAND is/are a bundle of cardiac muscle fibers connecting the interventricular

septum to anterior papillary muscles.

*Which of these vessels returns blood to the left atrium of the heart? PULMONARY VEINS.

*Which of these muscles is particularly associated with anchoring the right and left atrioventricular valves?

papillary muscles.

*The right tricuspid valve prevents backflow of blood from the right ventricle into the RIGHT ATRIUM.

*Pulmonary veins carry oxygenated blood to the left atrium.

*The pulmonary trunk and arteries are color-coded BLUE on models and in pictures, because they carry

OXYGEN-POOR blood.

*Select the sequence that correctly describes blood flow through the heart. left atrium to left ventricle to

body.

*The largest artery in the body, the aorta, leaves the heart from the LEFT VENTRICLE.

*Blood arriving in the right atrium has just come from the venae cavae and coronary sinus.

*Blood has just been discharged into the pulmonary trunk: from which chamber did it exit? the right

ventricle.

*The heart is called a double pump because it is two separate side-by-side pumps serving different

circulations.

*These vessels carry oxygen-rich blood. aorta and pulmonary veins.

*What is the name of the circuit that supplies blood to the brain, heart, and gastrointestinal tract?

systemic circulation.

*Blood passes through the bicuspid (or mitral) valve before entering the left ventricle.

*In the coronary circulation, oxygen-rich blood is provided to the heart muscle by the right and left

coronary arteries.

*Which artery supplies the anterior ventricular walls and laterodorsal part of the left side of the heart?

LEFT CORONARY ARTERY.

*Which of the veins listed here drains directly into the right atrium? ANTERIOR CARDIAC VEIN.

*Which of the following is a branch of the right coronary artery? posterior interventricular artery.

*A blockage in which of these vessels would most likely cause a myocardial infarction in the lateral right

side of the heart? right marginal artery.

*Blood enters the left and right coronary arteries directly from which vessel or chamber? AORTA.

*Cardiac muscle tissue is striated, like skeletal muscle tissue.