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Cardiovascular System > Electrical Activity Of The Heart > Flashcards

Electrical Activity Of The Heart Flashcards

1
Q

What is the physical connection between cardiac muscle cells

A

Desmosomes

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2
Q

What is the electrical connectionz between cardiac muscle cells

A

Gap junctions

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3
Q

Why can’t cardiac muscle exhibit tetanus (sustained contractions)

A

Cardiac muscle has a long refractory period

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4
Q

What is a synctium

A

A fusion of cells, in the heart by intercalated discs

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5
Q

Action potential time of cardiac Vs skeletal muscle

A

250ms

2ms in skeletal

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6
Q

How can Ca entry from outside the cell regulate contraction

A

Troponin is not fully saturated so contraction strength can be varied

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7
Q

Cells with unstable resting potentials

A

Act as pacemaker cells, rely on the increase of L-type Ca ions instead of Na ions as they have little Na channels

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8
Q

Effect of Ca channel blockers on heart

A

Decrease force of contraction

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9
Q

Effect of cardiac glycosides on the heart

A

Increase force of contraction

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10
Q

Effect of body temperature on the heart

A

Increases 10 beats per minute per degrees

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11
Q

Effect of hyperkalemia and hypokalemia on the heart

A

Fibrillation and heart block

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12
Q

Effect of hypercalcaemia on the heart

A

Increased heart rate and force of contraction

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13
Q

Effect of hypocalcemia on the heart

A

Decreased heart rate and force of contraction

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13
Q

Effect of hypocalcemia on the heart

A

Decreased heart rate and force of contraction

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14
Q

The sinoatrial node

A

First pacemaker and start of contraction. Conducts at 0.5m/s and is in the right atrium

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15
Q

The annulus fibrosus

A

The gap between the atriums and ventricles, stops conduction so that the only connection is the atrioventricular node and bundle of His

16
Q

The atrioventricular node

A

A delay box. Only conducts at 0.05m/s to allow blood to be pumped

17
Q

The bundle of His

A

Connection between right atrium and ventricles

18
Q

Purkinje fibres

A

Rapid conduction system in the ventricles. Conducts at 5m/s

Cardiovascular System (33 decks)

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