Heart Anatomy
This thick middle layer of the heart wall is composed primarily of cardiac muscle.
Myocardium
This specific node in the right atrium serves as the heart's natural pacemaker
Sinoatrial Node
These specific vessels are responsible for carrying blood away from the heart
Arteries
This term refers to the phase of the cardiac cycle when the heart is actively contracting
Systole
This side of the heart is responsible for pumping oxygen-poor blood to the lungs.
Right Side
These two superior chambers are known as the "receiving" rooms of the heart
Atria/Atrium
During this specific part of the cycle, blood flows passively into the ventricles from the atria.
Mid-to-late Diastole
These are the only vessels thin enough to allow for gas and nutrient exchange with tissues.
Capillaries
You calculate this by multiplying Heart Rate by Stroke Volume
Cardiac Output
Blood leaving the right ventricle must pass through this vessel to reach the lungs.
Pulmonary Artery
This specific valve prevents blood from flowing backward into the right atrium
Tricuspid Valve
This occurs when cold temperatures cause blood vessels to narrow.
Vasoconstriction
Unlike arteries, these vessels have the largest lumens and often require skeletal muscle "milking" to move blood.
Veins
A blood pressure reading consistently above 140/90 is medically known as this
Hypertension
After picking up oxygen in the lungs, blood returns to this specific chamber of the heart.
Left Atrium
Found between the left atrium and ventricle, this valve is also commonly called the mitral valve
Bicuspid Valve
These fibers are the final part of the conduction system that triggers ventricular contraction.
Purkinje Fibers
This is the correct structural sequence of the vascular system, starting from the heart and ending back at the heart
Arteries, Arterioles, Capillaries, Venules, Veins
This is the typical range for a healthy adult's systolic blood pressure.
Less than 120 mmHg
This circuit is responsible for carrying blood to the lungs for gas exchange
Pulmonary Circuit
Location of the heart?
Mediastinum/Between lungs
This internal system allows heart muscle cells to contract regularly without needing nerve impulses
Intrinsic Conduction System
This outermost layer of a blood vessel is made primarily of fibrous connective tissue.
Tunica Externa
Pulse is most commonly monitored at "pressure points" where these are close to the body surface
Artery
This is the primary reason the walls of capillaries are only one cell layer thick
To allow for the exchange of gases and nutrients