External Anatomy
Internal Anatomy
Cardiac Cycle
Cardiac Muscle
Other
100
The aorta arises from this chamber of the heart
Left ventricle
100
This is the thicker (more muscular) ventricle
The left ventricle
100
These valves open during contraction of the heart
The aortic and pulmonic valves
100
This is the fundamental motor unit
The sarcomere
100
This is a test that checks the electrical activity of the heart
EKG
200
The pulmonary veins enter this chamber of the heart
Left atrium
200
This valve lies between the right atrium and ventricle
The tricuspid valve
200
The closure of these valves make the first heart sound
The tricuspid and mitral valves
200
This is known as the thick filament
Myosin filament
200
This node is the master pacemaker of the heart
SA node
300
The fibrous sac that encloses the heart
The pericardium
300
This is the number of semilunar valve cusps that make up the aortic valve
Three
300
These valves are closed during ventricular filling
The aortic and pulmonic valves
300
What is the most important ion for cross-bridge formation
Calcium
300
The great vessels of the heart emerge from this location of the heart (base or apex)
The base
400
This vein travels in the coronary sulcus and empties into the right atrium
The coronary sinus
400
These muscles attach to the chordae tendineae and help prevent the atrioventricular valve from being everted into the atrium
The papillary muscles
400
This is the phase of the cardiac cycle when the heart contracts to pump blood into the aorta
Systole
400
What energy molecule is required to detach the myosin head from the actin filament
ATP
400
This is the number of heart tubes that eventual fuse during development
Two
500
The apex of the heart is located under this intercostal space
5th left intercostal space
500
This is the remnant of the foramen ovale
The fossa ovalis
500
This wave represents atrial depolarization on the EKG
P wave
500
These tubules help transmit action potentials to the center of the muscle cell
T-tubules
500
This congenital heart defect is characterized by 4 classic heart malformations
Tetralogy of Fallot
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