Carotid body A decrease in oxygen partial pressure, an increase in carbon dioxide partial pressure, and a decrease in arterial pH can all cause depolarization of the cell membrane, and they affect this by blocking potassium currents. This reduction in the membrane potential opens voltage-gated calcium channels, which causes a rise in intracellular calcium concentration. This causes exocytosis of vesicles containing a variety of neurotransmitters, including acetylcholine, noradrenaline, dopamine, adenosine, ATP, substance P, and met-enkephalin. These act on receptors on the afferent nerve fibres which lie in apposition to the glomus cell to cause an action potential. The feedback from the carotid
Dynamism of a Human Body: Boxer in any type of motion or fixed presence, but rather in such a way that it would "decompose according to the tendencies of its forces". Despite the abstractness of the painting, the viewer can make out movement by view of the contours and bundles of muscles. In general, the series of Boccioni's dynamisms attempt to document progressive movement through its various elements. The work was part of a forty-six drawing series. These drawings were displayed in the spring of 1914 at Florence. Dynamism of a Human Body: Boxer Dynamism of a Human Body: Boxer is a dynamism drawing created by