Histo Cardio Flashcards

1
Q

Consist only of endothelium with no tunica media or adventitia

A

Capillaries

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2
Q

Form the proximal part of channels called Thoroughfare channels

A

Metarterioles

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3
Q

Has a very thick tunica media characterized by alternating concentric layers of fenestrated elastic lamellae

A

Elastic (conducting) Arteries

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4
Q

Tunica media is the thickes layer composed of multiple layers

Tunica intima with prominent internal elastic membrane often wavy

A

Muscular (distributing) arteries

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5
Q

Type of capillarie with presence of transcellular channels through citoplasm

Where are they found?

A

Fenestrated capillaries

Found in areas of rapid exchange: endocrine glands and kidney

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6
Q

Type of capillaries that have gaps between endothelial cells, are the most leaky of the capillaries

Location?

A

Discontinuous (sinusoidal) Capillaries

Bone marrow sinusoids, liver sinusoids and lymph node sinusoids

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7
Q

Are a major site of action of vasoactive agents such as histamine and serotonin

A

Postcapilary Venules

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8
Q

Are low pressure vessels important for reabsortion of fluids from the CT

A

Postcapillary Venules

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9
Q

Regions in which theres is a direct connection between and artery and a vein

A

Arteriovenous Anastomoses (shunts)

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10
Q

Pulmonary circulation consist of what site of the heart

What happens?

A

Rt ventricle and Rt atrium

Receive returning blood from the inferior and superior vena cava and pump it to the lungs for axygenation

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11
Q

Systemic circulation

A

Lt atrium and Lt ventricle receive blood from the lungs via the 4 pulmonary trunks and pump it into the aorta

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12
Q

Blood vessels and nerves that supply the heart lie in _______________layer

A

Epicardium

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13
Q

Layer of the heart that contains the impulse conducting systema of the heart

A

Subendocardial layer of the encodardium

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14
Q

Thickest layer of the heart and consist of cardiac muscle

A

Myocardium

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15
Q

Major difference in the atrial vs ventricular cells of myocardium

A

Ventricular cells may have T-tubules and dyads

Atrial cells may contain atrial GRANULES with a precursor of atrial natriuretic factor

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16
Q

What causes the stimulation of the sympathetic nerves to the heart rate?

A

Brachycardia

Decreases it by releasing ACETYLCHOLINE en el SA y AV nodes

17
Q

What causes the stimulation of the sympathetic nerves to the heart?

A

Tachycardia

Increase heart rate by secreting NOREPINEPHRINE in the AV & SA nodes