The structural classification system groups joints into three types: synovial, cartilaginous, and fibrous joints, while the functional, or degree of movement, classification system groups joints into diarthrosis, synarthrosis, and amphiarthrosis type joints. Synovial Joints
In summary, thapsigargin treatment markedly attenuates juxtamedullary afferent arteriolar vasoconstrictor responses to Ang II or NE. In addition, depletion of intracellular calcium pools with thapsigargin completely abolishes the response of juxtamedullary efferent arterioles to these vasoconstrictor agents.hese studies were conducted to determine the role of calcium release from the thapsigargin-sensitive intracellular calcium pool on the Ang II-and NE-mediated vasoconstriction of juxtamedullary afferent and efferent arterioles.
Composed of a thick muscular wall, arterioles actively constrict and relax by means of myogenic, hormonal, and pharmacological mechanisms (19, 21). As the major vascular component that controls peripheral resistance, the arterioles are distinct from conduit arteries. The composition of arterioles is not dominated by collagen but by smooth muscle (7, 9), which makes up two thirds of arteriolar wall volume and determines the overall mechanical behavior. Collagen, which typically composes half of the volume of large arteries, has a negligible volume density in arteriolar composition (37). The composition of arteriolar walls has hardly been reported with the exception of the composition of rat cerebral pial arterioles, which have been extensively studied by