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IMSK Exam 2 > Introduction to the Heart > Flashcards

Flashcards in Introduction to the Heart Deck (19):
1

What covers the heart?

Pericardium

2

What are the two layers of the pericardium?

Fibrous layer
Serous layer

3

What is cardiac tamponade?

Increased fluid in between serous and fibrous layer

4

What does the fibrous skeleton of the heart do?

Anchors valves
Does not conduct electricity

5

What do spiral and circular layers do?

Wring the blood out with apex contracting (found shared between ventricles)

6

What is the serous pericardium also known as?

Epicardium (visceral layer)

7

What is unique about the size of cardiac cells?

Cardiac cells are the same size in all mammals to increase SA and oxygen diffusion

8

Which coronary arteries get the majority of blood flow?

Left and right coronary arteries

9

What does the left main coronary artery branch into?

Left anterior descending coronary artery
Circumflex coronary artery

10

Where in the heart does the PSNS have receptors?

AV and SA node

11

Where are the sympathetic nerves in the heart found?

Throughout

12

What type of ryanodine receptors are found in the heart?

RyR2

13

What are the types of calcium channels in the heart?

Ca (T) and Ca (L)

14

What are Ca (T) channels?

Calcium channels with transient quick depolarization allows for opening of Ca (L) channels

15

What are Ca (L) channels?

Calcium channels that stay open for longer

16

What does the cytoskeleton do?

Provides mechanical support to the myocyte

17

What do costameres do?

Transmits tension from the contractile apparatus to the extracellular matrix; keeps sarcomere anchored to contractile apparatus

18

What are the three purposes of the cytoskeleton?

Tension sensor
Signal transductor
Scaffolding structure

19

Which ventricle contracts first?

The left ventricle