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Anatomy 2402 > CH 19 Heart Part 2 > Flashcards

CH 19 Heart Part 2 Flashcards

1
Q

Vagal tone function?

A

Keeps a slow resting heart rate 75BPM

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2
Q

What is the pacemaker potential in nodal cells a result of?

A

Sodium inflow

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3
Q

What is an action potential of nodal cells due to?

A

Calcium ion inflow

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4
Q

What is repolarization of nodal cells due to?

A

Potassium outflow

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5
Q

What role does the medulla oblongata have on the heart?

A

It modifies the heart rate

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6
Q

What is depolarization (action potential) of nodal cells due to?***

A

calcium ion inflow

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7
Q

What is nodal cell repolarization due to?***

A

Potassium ion outflow

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8
Q

What is depolarization of cardiac cells due to?***

A

Large amounts of fast sodium inflow

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9
Q

What is plateau of cardiac cells due to?***

A

Slow calcium inflow at the same time of potassium outflow

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10
Q

What is repolarization of cardiac cells due to?***

A

Potassium outflow

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11
Q

Can the heart go under tetany, why or why not?***

A

No, because of its long refractory period

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12
Q

What happens if you have to much potassium in cardiac cells?

A
  1. Repolarization cant occur

2. Potassium will remain in the cell and cause it to continuously contract until the cell gives out (lethal injection)

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13
Q

Cardiac cycle order?***

A
  1. Atrial contraction and ventricle filling
  2. Isovolumetric contraction
  3. Ventricular ejection
  4. Isovolumetric relaxation
  5. Atrial relaxation and ventricular filling
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14
Q

What is a systole?

A

Contraction

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15
Q

What is a diastole?

A

Relaxation

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16
Q

How do find End Systolic Volume (ESV)?

A

EDV - SV = ESV

130mL - 70mL = 60 mL

17
Q

Cardiac muscle electrical events is order?

A
  1. Depolarization
  2. Plateau
  3. Repolarization
18
Q

Nodal cell electrical events in order?

A
  1. Pace maker potential
  2. Depolarization (action potential)
  3. Repolarization

Anatomy 2402 (33 decks)

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