Anatomy and Physiology Terms. Intro. to Anatomy and Physiology.
ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
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ANA T OMY AND PHYSIOLOGY OF THE CONDUC TION SYS TEM
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Transcript of ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
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ANATOMY AND PHYSIOLOGY OFTHE CONDUCTION SYSTEM
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Dream House
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STAIRCASE
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Hallway
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Toilet
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Bathtub
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Dinning Room
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Door
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TOPIC OUTLINE
ANATOMY OF THE HEART
ELECTRICAL CONDUCTION SYSTEM
ACTION POTENTIAL
ECG COMPLEX
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Your heart.
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Heart Walls
ENDOCARDIUM
MYOCARDIUM
EPICARDIUM
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PERICARDIUM
VISCERAL
PERICARDIAL
CAVITY
PARIETAL
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CORONARY ARTERIES
Right Coronary Artery
Left Coronary Artery
Left AnteriorDescending Artery
Left Circumflex Artery
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The Heart
It pumps blood Cardiac Output
±Amount of blood pumped by the heart per
minute
CO= SV x HR
± Stroke Volume- amount of blood pumped
by the heart per contraction
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The Heart
Neural Control Autonomic Nervous
System
±
Excitability ±Rate of Pacemaker Discharge
±Speed of Conduction
±Sympathetic fibers
±Parasympathetic fibers
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Electrical Conduction of the Heart
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`SA Node
Dominant pacemaker
located in upper portion of right atrium
Intrinsic rate 60100 bpm.
`AV Node
Slows conduction, creating a slight delaybefore impulses reach ventricles.
Intrinsic rate 4060 bpm.
Conduction system
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CONDUCTION SYSTEM
`Bundle of His
Transmits impulses to bundle branches.
Located below AV node.
`Purkinje fibers
Spreads impulses rapidly throughout
ventricular walls. Located at terminals of bundle branches.
Intrinsic rate 2040 bpm.
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ELECTROLYTES IN CELLULAR
PHYSIOLOGY
ACTION POTENTIAL
±Electrical process that stimulates eachmuscle cell in the heart to contract
POTASSIUM
±Major cation inside the cell at rest
SODIUM AND CALCIUM
±Major cations outside the cell at rest
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CARDIAC ACTION POTENTIAL
PHASE 4- movement of Ions while muscle
cells are at rest
PHASE 0 sodium and calcium enter the cell
± Stage of DEPOLARIZATION
±ATRIA- P WAVE ±VENTRICLES- QRS COMPLEX
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CARDIAC ACTION POTENTIAL
PHASES 1, 2,3- repolarization phenomenon
± Restoration of polarity
± PHASES OF REPOLARIZATION
± PHASE 1- fast Na channels suddenly close»Slow Ca channel remains open
± PHASE 2-plateau phase; flow Ca is balance with K
»ST SEGMENT
± PHASE 3 Ca Channel close but K continues to leak
»T Wave
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ACTION POTENTIAL
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CARDIAC CYCLE
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THE ECG COMPLEX
P WAVE
±Depolarization of atrial muscle cells
± First positive deflection
±Height- less than 3mm; Width 0.06-0.12
sec.
Q RS COMPLEX
±Depolarization of ventricular muscle cells
±Height- less than 25 mm; Width 0.06-0.10
sec.
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ECG COMPLEX
PR INTERVAL
±Beginning of the P wave to the beginning of QRS complex
±Duration is 0.12-0.20 sec.
Q T INTERVAL
±Total time required for depolarization andrepolarization of the ventricles
±Duration is 0.35-0.45 sec.
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ECG strip
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Standard Limb leads
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Augmented Limb Leads
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Chest lead placement
