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23 Cards in this Set

  • Front
  • Back
What is an intercalated disk?
Consists of fascia adherens, desmosomes, and gap jxns.
Continuous Capillaries:
Most frequent
present in skeletal muscle, connectice tissue, lung, brain

Uninterrupted barrier to macromolecules
Describe Cardiac Myocytes
1)Contract through intrinsic action potentials that are passed to neighbors via GAP JXN
2)Contain a Diad which is a T-tubule flanked by one terminal cisterna
3) Intercalated disks
Describe the adventitia (3)
1) Fibroblasts
2) Type I collagen
3) Some elastic fibers
What does epicardium consist of?
Connective tissue and a layer of mesothelium. (Visceral layer of the pericardial sac)
Arterioles are different in tunica media why?
1)The tunica media consists of only 1 -2 layers of smooth muscle cell.
2)Plays a major role in reg. blood pressure.
Are purkinje myocytes neurons?
NO, they arejust modified myocytes
Describe the intima. (4)
1)Consists of endothelium,
2)basal lamina,
3)loose connective tissue,
4)internal elastic membrane
What is endocardium lined with?
Endothelium on top of subendocardial layer that is continuous with the tunica intima of blood vessels
What makes muscular arteries different?
Tunica intima with a PROMINENT internal elastic lamina and a tunica media with a PROMINENT smooth muscle cell component
Can cardiac muscle be repaired?
No, the muscles cannot regenerate, but the injury is usually replaced with connective tissue.
Lymphatic Vessels:
Lymph capillaries are blind ended and resemble sinusoids.

They may show three distinct TUNICS.

Have many closely spaced valves.
What is in the subendocardial later?
Blood vessels, nerves and purkinje fibers.
Tubes of endothelium reinforced by a basal lamina. Cross sectional area is 800 times that of aorta. Site of exchange of nutrients.

1) continuous
2) fenestrated
3) sinusoidal
What are the three tunics of blood vessels (b.v)?
Tunica intima
Tunica media
Tunica adventitia
Describe the media (4)
1)smooth muscle cells
2)Type III collagen
3)Elastic fibers
4)external elastic lamina
Large Veins:
I: thicker with scattered bundles of longitudinal SM (Internal elastic membrane?)
M: Thin lacks SM
A: THICKEST with connective tissue and longitudinal SM
Intima: only an endothelium
Media: Thin (1-2 layers of muscle, few elastic fibers
Adventitia: Slightly thicker than media and made of longitudinally arranged collage fibers
Sinusoidal Capillaries:
Gaps are present between endothelial cells allowing passage of large molecules and cells
What makes Elastic Arteries so great?
Have tunica media with a prominent elastic fiber component that responds to the high systolic pressure
Fenestrated capillaries:
Endothelial cells are perforated by pores. These holes allow very large molecules to cross the endothelium
Small to medium veins:
Intima: endo alone, or together with elastic fibers and bundles of longitudinal smooth muscle
Media: Thin --alternating plates of SM and networks of collagen and elastic fibers
Adventitia: well developed fibroelastic coat
How do you identify a vein?
It is with an accompanying artery.