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2024年5月28日 · human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, posture, and balance. Broadly considered, human muscle—like the muscles of all vertebrates—is often divided into striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle.
atomic number, the number of a chemical element in the periodic system and on the periodic table that equals the number of protons in the nucleus of the atom. The elements are arranged on the table in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the ...
earl. baron. marquess. British nobility, in the United Kingdom, members of the upper social class, who usually possess a hereditary title. The titled nobility are part of the peerage, which shares the responsibility of government. The peerage comprises five ranks, which are, in descending order, duke, marquess, earl, viscount, and baron.
2024年4月21日 · Hugo Weaving in V for Vendetta (2006), wearing a Guy Fawkes mask, which became a symbol for Anonymous. Anonymous, decentralized international movement of digital activists known for generating high-profile cyberattacks against governments, companies, and other institutions. Participants in Anonymous and their supporters (“Anons”) sometimes ...
2024年5月3日 · plant cell, the basic unit of all plants. Plant cells, like animal cells, are eukaryotic, meaning they have a membrane-bound nucleus and organelles. The following is a brief survey of some of the major characteristics of plant cells. For a more in-depth discussion of cells, see cell.
2024年5月2日 · chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. Every substance, whether naturally occurring or artificially produced, consists of one or more of the hundred ...
2 天前 · Islam, major world religion promulgated by the Prophet Muhammad in Arabia in the 7th century ce. The Arabic term islām, literally “surrender,” illuminates the fundamental religious idea of Islam—that the believer (called a Muslim, from the active particle of islām) accepts surrender to the will of Allah (in Arabic, Allāh: God).
