In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
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Question: When it interacts with ryanodine receptors, this element upregulates its own release, and this compound forms the cell plates of coccolithophores. Stimulation of Gq ("g-sub-q") opens a channel that allows for this ion's movement, and proteins that bind this ion have an EF hand motif. Cellular concentrations of this ion are regulated by IP3. Parafollicular cells of the (*) thyroid produce a compound that reduces the concentration of this ion in blood, and its intestinal absorption requires vitamin D. This ion interacts with Troponin to stimulate muscle contraction, and the lumens of sarcoplasmic reticula have high concentrations of this ion. For 10 points, name this divalent cation that is stored in bones.

Answer: Science


Question: The highest point in this nation is Phou Bia, just south of the Plain of Jars on the Plateau de Xiangkhoang. Its eastern border is formed by the Annamese Cordillera, which run until meeting the Boloven Plateau in the south. These highlands are the source of many rivers, including the Ou, Kadong, Wa, Kong, and Banghiang, and flow past cities such as Muang Huang, Saravan, Phongsali, and Pakxe into the Mekong, which forms the western boundary with Myanmar and Thailand. FTP, name this landlocked southeast Asian nation with a capital of Vientiane.

Answer: Social Science


Question: Arnold Bax's fifth symphony was heavily influenced by, and dedicated to, this composer. The first movement of this composer's sixth symphony is based on the stepwise ascendancy of the D Dorian mode, which permeates the whole work. This composer's only mature string quartet is subtitled "Voces intimae". His fourth symphony opens with the notes C-D-F sharp-E; that symphony has a third movement Il tempo largo and is quite grim due to its composer's brush with throat cancer. This composer saw the symphony as a musical process in which "profound logic" connects the motifs, whereas Mahler thought it "must be like the world". Willy Burmester vowed to never play this composer's D minor violin concerto after two versions were premiered without him. His seventh symphony is remarkable for only having one movement. For 10 points, identify this composer of many tone poems based on the Kalevala,  as well as Finlandia.

Answer:
Fine Arts