Heart Histology--Downing

Question 1

In which layer do the Purkinje fibers lay?

Answer 1

subendothelial CT of endocardium

Question 2

Endocardium is continuous with

Answer 2

tunica intima of blood vessels

Question 3

Two components of endocardium

Answer 3

endothelium

subendothelial CT

Question 4

What is the fine CT between adjacent cardiac myocytes called?

Answer 4

endomysium

Question 5

Specialized cardiac muscle cells

3 types

Answer 5

attachment to cardiac skeleton

endocrine secretions

impulse generation and conduction

Question 6

Endomysium function

Answer 6

hold together cardiac myocytes to form nice, contractile unit

Question 7

Intercollated discs

Answer 7

where myocytes bump up next to each other

Question 8

What costitutes fibrous epicardium?

Answer 8

loose CT

fat

nerve fibers (phrenic nerves)

arteries and veins (coronary vessels)

Question 9

Pericaridal sac location

Answer 9

between parietal and visceral layers of pericardium

Question 10

Pericarditis pathology

Answer 10

inflammation of pericardial sac

layer between visceral and parietal layers of pericardium

Question 11

Where is the SA node located?

Answer 11

wall of superior vena cava adjacent to junction with right atrium

Question 12

Conduction pathway

Answer 12

SA –> AV –> AV bundle (bundle of his) –> Purkinje fibers

Question 13

Purkinje fibers are made up of what type of tissue?

Answer 13

modified cardiac muscle cells

not neuro cells

Question 14

Impulse supply to papillary muscles

Answer 14

Purkinje fibers

Question 15

Cardiac skeleton is made of what type of tissue?

Answer 15

dense CT