CSC Cardiac Anatomy & Physiology Flashcards
6 cards from real CSC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CSC Cardiac Anatomy & Physiology flashcards as text
Which layer of the heart wall contains the cardiac muscle cells responsible for contraction?
Answer: Myocardium
The myocardium is the middle muscular layer of the heart wall and is responsible for the contractile force of each heartbeat.
The sinoatrial (SA) node is located in the:
Answer: Right atrium near the superior vena cava
The SA node, the heart's primary pacemaker, is located in the right atrium near the junction with the superior vena cava.
Preload is best defined as:
Answer: End-diastolic volume or ventricular filling pressure
Preload refers to the ventricular end-diastolic volume (or pressure), representing the stretch on myocardial fibers before contraction.
Afterload refers to:
Answer: The resistance the ventricle must overcome to eject blood
Afterload is the resistance (primarily systemic vascular resistance) that the ventricle must overcome to eject blood into the aorta.
The interventricular septum separates:
Answer: The right and left ventricles
The interventricular septum is the muscular/membranous wall dividing the right and left ventricles.
Which structure prevents backflow of blood from the aorta into the left ventricle?
Answer: Aortic valve
The aortic valve prevents backflow from the aorta into the left ventricle during diastole by closing when aortic pressure exceeds ventricular pressure.