cardiac muscle
Myocardium, essentially
Cardiac muscle is the specialized tissue forming the walls of the heart.
Unlike skeletal muscle, which you control voluntarily, cardiac muscle contracts rhythmically on its own, pumping blood throughout the body without conscious effort.
Its fibers are interconnected, allowing electrical signals to spread rapidly and the heart to beat as a coordinated unit.
Heart muscle contraction phase
- diastoleCardiac relaxation phase
- pumpFluid-moving machine
- actinCellular contractile protein
- myosinMotor protein enabling contraction
troponin · filament · calcium · relaxation · shortening
Marked with parallel grooves
- involuntaryNot under conscious control
- mitochondriaCell's energy-producing organelles
- aerobic respirationOxygen-using energy production
- nucleiCentral parts of atoms
Rhythmic cardiac contraction
- pulseArterial blood throb
- lub-dubHeart's acoustic signature
- pacemakerDevice regulating heartbeat
- electrocardiogramHeart's electrical activity record
arrhythmia · fibrillation · sinus rhythm · depolarization · repolarization · automaticity
Roofed central hall
- ventricleHollow organ chamber
- coronaryOf heart arteries
- aortaChief arterial trunk
- valveFluid flow controller
septum · artery · vein · capillary · papillary · chordae tendineae
Tissue necrosis from ischemia
- ischemiaInsufficient tissue blood supply
- anginaIschemic chest discomfort
- cardiomyopathyHeart muscle disorder
- stenosisAbnormal bodily narrowing
heart failure · myocarditis · hypertrophy · atrophy · necrosis · fibrosis · echocardiogram · coronary artery disease
systole
Heart muscle contraction phase
myosin · troponin · filament · calcium · relaxation · shortening
striated
Marked with parallel grooves
- involuntaryNot under conscious control
- mitochondriaCell's energy-producing organelles
- aerobic respirationOxygen-using energy production
heartbeat
Rhythmic cardiac contraction
electrocardiogram · arrhythmia · fibrillation · sinus rhythm · depolarization · repolarization · automaticity
atrium
Roofed central hall
valve · septum · artery · vein · capillary · papillary · chordae tendineae
infarction
Tissue necrosis from ischemia
- ischemiaInsufficient tissue blood supply
- anginaIschemic chest discomfort
- cardiomyopathyHeart muscle disorder
stenosis · heart failure · myocarditis · hypertrophy · atrophy · necrosis · fibrosis · echocardiogram · coronary artery disease
- body partsarm, leg, hand, back, chest
- Circulatory Systemheart rate, blood, artery, veins, capillary
- musculoskeletalbone, bones, muscles, joint, joints
- muscle systembiceps, triceps, deltoid, deltoids, quadriceps
- musclesbiceps, triceps, abs, hamstrings, quads
- tissuesadipose, neural tissue, fibrous tissue, bone, connective
muscle, muscular, muscled, muscly, cardiac, cardiologist, cardiology, tachycardia, myocardial