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  • Calcitonin
    A hormone produced by the thyroid that plays a role in regulating calcium levels.
  • Cerebellum
    That part of the brain concerned with fine motor coordination and body movement, posture, and balance; is part of the hindbrain and is attached to the rear portion of the brain stem.
  • Cerebrum
    The part of the forebrain that includes the cerebral cortex; the largest part of the human brain.
  • Channels
    Transport proteins that act as gates to control the movement of sodium and potassium ions across the plasma membrane of a nerve cell.
  • Chemical Equilibrium
    The condition when the forward and reverse reaction rates are equal and the concentrations of the products remain constant.
  • Chromatin
    A complex of DNA and protein in eukaryotic cells that is dispersed throughout the nucleus during interphase and condensed into chromosomes during meiosis and mitosis.
  • Chromosomes
    Structures in the nucleus of a eukaryotic cell that consist of DNA molecules that contain the genes.
  • Cilia
    Hair-like organelles extending from the membrane of many eukaryotic cells; often function in locomotion (sing.: cilium).
  • Circulatory System
    One of eleven major body organ systems in animals; transports oxygen, carbon dioxide, nutrients, and waste products between cells and the respiratory system and carries chemical signals from the endocrine system; consists of the blood, heart, and blood vessels.
  • Clavicle
    The collar bone.
  • Clitoris
    A short shaft with a sensitive tip located where the labia minora meet; consists of erectile tissue and is important in female sexual arousal.
  • Coenzymes
    Chemicals required by a number of enzymes for proper functioning; also known as enzyme cofactors.
  • Cohesion
    The force that holds molecules of the same substance together.
  • Compact Bone
    The outer dense layer that forms the shaft of the long bones; made up of concentric layers of mineral deposits surrounding a central opening.
  • Compound
    A substance formed by two or more elements combined in a fixed ratio.
  • Connective Tissue
    Animal tissue composed of cells embedded in a matrix (gel, elastic fibers, liquid, or inorganic minerals). Includes loose, dense, and fibrous connective tissues that provide strength (bone, cartilage), storage (bone, adipose), and flexibility (tendons, ligaments).
  • Coronary Arteries
    Arteries that supply the heart's muscle fibers with nutrients and oxygen.
  • xxx Central Nervous System (CNS)
    The division of the nervous system that includes the brain and spinal cord.
  • xxxCervix
    The lower neck of the uterus that opens into the vagina.
  • Cerebral Cortex
    The outer layer of gray matter in the cerebrum; consists mainly of neuronal cell bodies and dendrites in humans; associated with higher functions, including language and abstract thought.

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