By Robert Klein, George Enders
This distinctive try out prep consultant allows you to try your wisdom of crucial anatomy, histology and phone biology suggestions for the USMLE Step 1; perform with 500 USMLE Step 1-style questions with referenced solutions; evaluate motives for correct and incorrect answers;and construct self belief, talents, and data.
Read or Download Anatomy, Histology, and Cell Biology PreTest Self-Assessment and Review, Third Edition (PreTest Basic Science) PDF
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Additional info for Anatomy, Histology, and Cell Biology PreTest Self-Assessment and Review, Third Edition (PreTest Basic Science)
The process originates with a clathrincoated pit that invaginates to form a coated vesicle that fuses with an endosome. , uptake of cholesterol). Endosomes subsequently fuse with lysosomes. Internalized receptor/ligand complexes may be conserved, degraded, or recycled. EPITHELIUM Epithelial cells line the free external and internal surfaces of the body. Epithelia have a paucity of intercellular substance and are interconnected by junctional complexes. Components of the junctional complex include the zonula occludens (tight junction), which prevents leakage between the adjoining cells and maintains apical/basolateral polarity; zonula adherens, which links the actin networks within adjacent cells; and macula adherens (desmosome), which links the intermediate filament networks of adjacent cells.
In contrast, the pancreas has both exocrine (acinar cells) and endocrine (islet cells) components that synthesize pancreatic juice and blood sugar–regulating hormones, respectively. The exocrine pancreas is primarily regulated by the hormones cholecystokinin (CCK) and secretin, which primarily regulate acinar and ductal secretion, respectively. The liver is also a dual-function gland whose exocrine product is bile, synthesized by hepatocytes, and transported by a duct system to the gallbladder for storage and concentration.
Skeletal muscle is a syncytium, while cardiac muscle consists of individual cells connected by intercalated disks. The organization of striated muscle is shown below: Extrafusal muscle fibers generate the force of contraction while intrafusal fibers (both IA and II-type fibers (receptors) serve as sensory detectors signaling muscle location (proprioception) and the rate of contraction. High-Yield Facts 23 Smooth muscle contraction closely resembles the cell motility exhibited in other cell types.
Anatomy, Histology, and Cell Biology PreTest Self-Assessment and Review, Third Edition (PreTest Basic Science) by Robert Klein, George Enders