Histo Cardio Flashcards
Consist only of endothelium with no tunica media or adventitia
Capillaries
Form the proximal part of channels called Thoroughfare channels
Metarterioles
Has a very thick tunica media characterized by alternating concentric layers of fenestrated elastic lamellae
Elastic (conducting) Arteries
Tunica media is the thickes layer composed of multiple layers
Tunica intima with prominent internal elastic membrane often wavy
Muscular (distributing) arteries
Type of capillarie with presence of transcellular channels through citoplasm
Where are they found?
Fenestrated capillaries
Found in areas of rapid exchange: endocrine glands and kidney
Type of capillaries that have gaps between endothelial cells, are the most leaky of the capillaries
Location?
Discontinuous (sinusoidal) Capillaries
Bone marrow sinusoids, liver sinusoids and lymph node sinusoids
Are a major site of action of vasoactive agents such as histamine and serotonin
Postcapilary Venules
Are low pressure vessels important for reabsortion of fluids from the CT
Postcapillary Venules
Regions in which theres is a direct connection between and artery and a vein
Arteriovenous Anastomoses (shunts)
Pulmonary circulation consist of what site of the heart
What happens?
Rt ventricle and Rt atrium
Receive returning blood from the inferior and superior vena cava and pump it to the lungs for axygenation
Systemic circulation
Lt atrium and Lt ventricle receive blood from the lungs via the 4 pulmonary trunks and pump it into the aorta
Blood vessels and nerves that supply the heart lie in _______________layer
Epicardium
Layer of the heart that contains the impulse conducting systema of the heart
Subendocardial layer of the encodardium
Thickest layer of the heart and consist of cardiac muscle
Myocardium
Major difference in the atrial vs ventricular cells of myocardium
Ventricular cells may have T-tubules and dyads
Atrial cells may contain atrial GRANULES with a precursor of atrial natriuretic factor
