Histology Week 1

Question 1

What are these characteristics of:

-Dense, fibrous connective tissue
-Lined by endothelium
-Bases attached to annuli fibrosi

Answer 1

valves

Question 2

Do atrial and ventricular muscles directly connect?

Answer 2

no

Question 3

layers of heart

Answer 3

1. Endocardium (includes endothelium and subendothelium)
2. Myocardium (muscular layer, thickest)
3. Epicardium (outermost fatty layer, includes visceral pericardium, nerves and vessels are here)

Question 4

3 cell types in Myocardium

Answer 4

1. Contractile (working cells)
2. Impulse generating (Nodal cells)
3. Impulse conducting (Purkinje)

They are all muscle cells but look different

Question 5

Where do T tubules lie in cardiac tissue versus skeletal tissue?

Answer 5

Cardiac: over z discs

Skeletal: AI junctions

Question 6

Know histology pictures

Answer 6

know histology pictures

Question 7

What 3 things make up intercalated discs?

Answer 7

1. Adherent junction (zonular)- holds cells together at junctional site
2. Desmosome- holds cells together in irregular patches
3. Spot connections allows ions to pass from one cell to another

Question 8

Are purkinje cells faster or slower than normal cardiac muscle

Answer 8

faster

Question 9

What is AV node’s role in heart conduction?

Answer 9

slows down impulse from SA node and atrial contraction