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 Dynamism of a Human Body: Boxer Dynamism of a Human Body: Boxer is a dynamism drawing created by the futurist Italian artist Umberto Boccioni. The work was intended to show a subject in between a state of motion and stillness. Painter Umberto Boccioni, one of the earliest members of the school of futurism, had in 1912 found an interest in sculpture. During the early stages of his pursuit, Boccioni found himself working on the dynamism of forms. Boccioni wanted to find a single form which would capture all movement, as opposed to having a series of images. Viewing the past