2. Cardiac Cycle Flashcards Preview

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Flashcards in 2. Cardiac Cycle Deck (12):
1

What is the definition of convection?

Mass movement of fluid caused by pressure difference

2

What are the components of convection in the human body?

• Heart – driving force (creates large pressures)
• Arteries – distribution (alter blood flow)
• Capillaries – exchange (huge numbers - thin)
• Veins – reservoir (2/3rd of blood volume)

3

1st stage of electrical conduction through the heart?

Electrical activity generated in the SA nodes spreads out via gap junctions in the atria

4

2nd stage of electrical conduction through the heart?

At AV node, conduction is delayed to allow correct filling of ventricles

5

3rd stage of electrical conduction through the heart?

Conduction occurs rapidly through bundle of His into ventricles

6

4th stage of electrical conduction through the heart?

Conduction through Purkinje fibres spreads quickly throughout the ventricles

7

What does the P wave represent?

Atrial depolarisation

8

What does the PR segment represent?

AV nodal delay

9

What does the QRS complex represent?

Ventricular depolarisation (atria repolarising simultaneously).

10

What does the ST segment represent?

Time during which the ventricles are contracting and emptying

11

What does the T wave represent?

Ventricular repolarisation

12

What does the TP interval represent?

Time during which ventricles are relaxing and filling