51) The desmosome-like structures that attach adjacent cardiac muscle cells are called
A) fasciae adherens.
B) gap junctions.
C) intercalated disks.
D) T tubules.
52) Oxygen-poor blood returns to the heart and enters the
A) right atrium.
B) left atrium.
C) left ventricle.
D) right ventricle.
53) Which structure develops from the embryological chamber called the sinus venosus?
A) sinoatrial (SA) node
B) the right ventricle
C) the left atrium
D) the pulmonary trunk
54) The small cardiac vein is present on the
A) right ventricle.
B) left ventricle.
C) right atrium.
D) left atrium.
55) The epicardium is the same as the
A) visceral layer of serous pericardium.
B) pericardium.
C) endocardium.
D) fibrous pericardium.
56) A specific coronary vessel that lies in the anterior interventricular sulcus is the
A) anterior interventricular artery/Left anterior descending artery (LAD).
B) middle cardiac vein.
C) coronary sinus.
D) circumflex artery.
57) The artery that nourishes the walls of the left atrium is the
A) anterior interventricular.
B) circumflex.
C) posterior interventricular.
D) right coronary.
58) The heart chamber with the thickest wall is the
A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.
59) A specific coronary vessel that lies in the coronary sulcus is the
A) posterior interventricular artery.
B) right coronary artery.
C) small cardiac vein.
D) right marginal artery.
60) The heart chamber that pumps oxygenated blood around the systemic circuit is the
A) right atrium.
B) left atrium.
C) right ventricle.
D) left ventricle.