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2240 Cardiovascular system > Blood flow and electrical stuff of heart > Flashcards

Blood flow and electrical stuff of heart Flashcards

1
Q

The pulminary circuit carries __ blood to the ___

A

Co2, Lungs

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2
Q

What is the average resting heart rate?

A

~ 75 bpm

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3
Q

What system sets the resting heart rate?

A

Intrinsic conduction or the nodal system

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4
Q

Define pacemaker cells

A

Non contractile cardiac muscle cells that spontaneously depolorize

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5
Q

Which cardiac muscle cells are responsible for contraction?

A

Contractile Cells

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6
Q

What are the pacemaker cells?

A

Sinoatrial Node
Atrioventricular node
atrioventriuclar bundle
Right and Left bundle branches
Purkinje fibers

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7
Q

What is the Lub sound when the heart beats caused by?

A

When atrioventricular valves close

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8
Q

What is the Dub sound when the heart beats caused by?

A

When the semilunar valves close

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9
Q

What causes an adult heart murmur

A

A defective heart valve

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10
Q

What does the vagus nerve do in terms of contraction of the heart?

A

It decreases the rate of contraction

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11
Q

The right vagus nerve affects which pacemaker cells?

A

Sinoatrial node

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12
Q

The left vagus nerve affects which pacemaker cells?

A

Atrioventricular node

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13
Q

Which nerve increases rate of contraction of the heart?

A

Spinal nerves T1-4

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14
Q

What does an EKG do?

A

Records electrical events in the heart

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15
Q

What does the P wave represent?

A

Represents the Sinoatrial node depolorizing and atria contraction

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16
Q

What does the P-R interval represent?

A

The time it takes for the depolorization to reach the atrioventricular node
this is the delay period

17
Q

What does QRS interval represent?

A

Represents the contraction of the ventricles and atrial relaxation

18
Q

What does the T wave represent?

A

Relaxation of the ventricle

19
Q

Systole

A

Contraction

20
Q

Diastole

A

relaxation

21
Q

What is the general order of the heartbeat?

A

Atrial Contraction and Ventricular filling
Isovolumetric contraction
Ventricular ejection
Isovolumetric relaxation
Atrial Relaxation and ventricular filling

22
Q

What happens in Atrial Contraction and Ventricular Filling?

A

The ā€œPā€ wave
Sinoatrial node depolorizes
Atria contract and Ventricles get filled w blood
AV valves open, SL closed
Atrial and Artery pressure is greater than Ventricular pressure

23
Q

What happens during isovolumetric contraction?

A

2240 Cardiovascular system (4 decks)

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