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BMS165 > Cardiac muscle and conduction WK8 L1 > Flashcards

Cardiac muscle and conduction WK8 L1 Flashcards

1
Q

WHAT DOES THE SYMPATHETIC NERVE SUPPLY DO FOR THE HEART?

A

CAN RISE HEART RATE TO 230 BPM -

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2
Q

HOW ARE THE SYMPATHETIC NERVES CONNECTED TO THE HEART?

A

UPPER THORASIC SPINAL CHORD THROUGH SYMPATHETIC CHAIN TO CARDIAC NERVES - DIRECTLY TO VENTRICULAR MYOCARDIUM

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3
Q

WHAT DOES THE PARASYMPATHETIC NERVE SUPPLY DO FOR THE HEART?

A

SLOWS HEART RATE TO 70-80 BPM -

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4
Q

HOW ARE THE PARASYMPATHETIC NERVES CONNECTED TO THE HEART?

A

RIGHT VAGUS NERVE TO SA NODE - LEFT VAGUS NERVE TO AV NODE - NO VAGAL INNERVATION TO VENTRICULAR MYOCARDIUM

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5
Q

WHAT ARE MYOCYTES?

A

SHORT BRANCHES CELLS WITH ONE CENTRAL NUCELUES

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6
Q

WHAT DOES SARCOPLASMIC RETICULUM AND T-TUBULES DO?

A

ALLOW THE FLOW OF Ca2+ FROM EXTRACELLULAR FLUID

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7
Q

WHY DO INTERCALATED DISCS JOIN TO MYOCYTES?

A

INTERDIGITATING FOLDS FOR INCREASED SURFACE AREA - HOLDS CELLS TOGETHER FOR STRUCTURAL SUPPORT - ELECTRICAL JUNCTION FOR GAP JUNCTION TO ALLOW IONS TO FLOW BETWEEN CARDIOMYOCYTES - FATIGUE RESISTANT

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8
Q

WHAT IS SYSTOLE?

A

VENTRICULAR CONTRACTION

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9
Q

WHAT IS DIASTOLE?

A

VENTRICULAR RELAXATION

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10
Q

HOW IS THE SINUS RYTHM SET?

A

BY THE SA NODE

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11
Q

HOW IS THE NODAL RYTHM SET?

A

BY THE AV NODE

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12
Q
A

NORMAL SYNUUS RYTHM

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13
Q
A

SECOND DEGREE (PARTIAL) BLOCK

DELAY IN CONDUCTION BETWEEN ATRIAL AND VENTRICAL

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14
Q
A

ATRIAL FIBRILATION

SIGNALS IN ATRIA ARE CHAOTIC - AV NODE THEN BOMBARDED WITH SINGALS TRYING TO GET THROUGH TO THE VENTRICLES

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15
Q
A

VENTRICULAR TACHYCARDIA

FASTER CONTRACTION OF VENTRICLES THAT DOES NOT ALLOW VENTRICLES TO FILL AND SQUEEZE ENOUGH BLOOD TO BODY

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16
Q
A

VENTRICULAR FIBRILATION

CHAOTIC HEART SIGNALS CAUSE VENTRICLES TO FIBRILATE AND CANNOT PUMP BLOOD

17
Q

WHAT IS THE ACTION POTENTIAL THRESHOLD FOR NODE POTENTIALS?

A

-40

18
Q

HOW IS THE ACTION POTENTIAL THRESHOLD REACHED?

A

SLOW RELEASE OF SODIUM IONS INTO THE CELL

19
Q

WHAT HAPPENS WHEN THE ACTION POTENTIAL THRESHOLD IS REACHED?

A

ACTION POTENTIAL TRIGGERED AND FAST CALCIUM INFLOW INTO THE CELL

20
Q

WHAT HAPPENS DURING THE REPOLARISATION PAHSE OF ACTION POTENTIAL?

A

FAST POTASSIUM OUTFLOW OUT OF THE CELL UNTILL ACTION POTENTIAL HITS -60

21
Q

WHAT CREATES A HEARTBEST?

A

EACH REPOLARISATION

22
Q
A

ATRIAL DEPOLARISATION BEGINS

23
Q
A

ATRIAL DEPLOARIZATION COMPLETE (ATRIA CONTRACTED)

24
Q
A

VENTRICLES BEIGN TO DEPOLARIZE A APEX - ATRIA REPOLARIZED (ATRIA RELAXED)

25
Q
A

VENTRICULAR DEPOLARIZATION COMPLETED (VENTRICLES CONTRACTED)

26
Q
A

VENTRICLES BEGIN TO REPOLARIZE AT APEX

27
Q
A

VENTRICULAR REPOLARIZETION COMPLETE (VENTRICLES RELAXED)

BMS165 (39 decks)

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