NWHSU Histology 2 Test 1 - Circulatory System
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| Which specialized cardiac muscle fibers are smaller, have fewer gap junctions and fewer intercalated discs than regular cardiac muscles fibers? | AV Node
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| How would these specialized cells (AV Node) function differently than regular cardiac muscle? | SLOWER conduction speed through the AV node (.01 m/sec vs. 0.3 m/sec for working atrial muscle)
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| Name the blood vessel described: primary factor in maintenance of normal arterial blood pressure | Arteriole
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| Name the blood vessel described: Endothelium usually the most responsive to histamine and so is very important in the inflammatory response | Venules
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| Name the blood vessel described: Often associated with phagocytic cells | Discontinuous sinusoids
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| The Atheromatous plaque begins in the A_________(layer) of the B._________ (vessel) | A. Tunica Intima B. Arteries (is not found in veins)
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| What type of capillaries would be expected in an endocrine gland? | Fenestrated capillaries
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| Compared to a medium sized artery, a medium sized vein has more A.______ and less B. ________ | A. Collagen B. Smooth muscle and elastic
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| Which cells of the heart secrete angiopeptins? | Atrial myocytes
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| Which group of cardiac muscle cells has the SLOWEST transmission speed? | AV Node
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| Give the components of the parietal pericardium. | Outer dense fibrous layer and Inner serous layer
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| Calcific Valve disease usually affects the ________ valve. | Aortic valve
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| What are the two main consequences of atheroma in the coronary arteries? | Impaired blood flow and Thrombus formation (blood clot)
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| Describe the parietal pericardium: The outer layer is composed of A. ______ and the inner layer is composed of B.________ | A. Dense fibrous CT membrane B. Inner Serous Layer
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| What type of capillary would most likely be found in endocrine organs? | Fenestrated capillary
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| In most people, the sinoatrial (SA) node in the pacemaker. What makes it the pacemaker? | Greatest rate of intrinsic depolarization
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| The atrial and ventricular muscles are connected by the _______ | Cardiac skeleton
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| Describe the tunica media of an elastic artery. | Alternating sheets of smooth muscle and elastic
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| What portion of the conducting system pierces the cardiac skeleton? | AV Bundle
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| What would happen if this structure was damages? | There would be no conductance to the ventricles
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| How does the cytology of purkinje fibers differ from that of regular cardiac muscle fibers? | Larger cells, more gap junctions, more intercalated discs, increased glycogen, decreased myofibrils
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| The parietal pericardium is non- distensible. Describe why? | Due to the dense fibrous connective tissue in it.
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| Which cells of the arteriole would likely secrete a product which inhibits platelet aggregation? | Endothelial cells in the tunica intima
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| Describe the structure of the least permeable capillary | Continuous endothelium and basil lamina w/occluding junctions
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| Which cells of the heart secrete a product which causes relaxation of vascular smooth muscle and the loss of sodium and water through the kidney? | Atrial myocardial cells (myocyte) secrete atrialpeptins
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| Choose the items below which describe an elastic artery. Put all correct. A. is primarily responsible for the maintenance of normal arterial blood pressure | false (arterioles are responsible for pressure)
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| Choose the items below which describe an elastic artery. Put all correct. B. has a pronounced internal elastic lamina | true
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| Choose the items below which describe an elastic artery. Put all correct. C. has abundant elastic in its tunica media D. has abundant smooth muscle in its tunica media | true
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| How does the structure of the lacteal relate to its function? | Discontinuous basal lamina, large molecules
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| In the heart, elastic tissue is an important component of the ______. | atrial myocardium
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| Painful red streaks radiating from a puncture wound would suggest inflammation of the ______. | lymphatic vessels
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| What type of capillary contributes to the blood-air barrier in the lung? | continuous epithelium
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