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  • Human muscle system | Functions, Diagram, Facts | Britannica
    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, smooth muscle, and cardiac muscle
  • skeletal system - Kids | Britannica Kids | Homework Help
    The collection of bones in an animal’s body is called a skeletal system, or skeleton Mammals, birds, reptiles, amphibians, and fish have skeletal systems inside their…
  • Diaphragm | Definition, Function, Location | Britannica
    Diaphragm, dome-shaped, muscular and membranous structure that separates the thoracic and abdominal cavities in mammals; it is the principal muscle of respiration Contraction of the diaphragm increases the internal height of the thoracic cavity, thus lowering its internal pressure and causing inspiration of air
  • iron - Students | Britannica Kids | Homework Help
    Iron cores are used in electromagnets for telephones, motors, and other equipment Iron in the Human Body About 0 004 percent of the total weight of a person is iron, or about one tenth of an ounce (3 grams) in the average-sized adult Iron is in every body cell and also helps cells oxidize food by iron-containing enzymes called cytochromes
  • Lymphatic system | Structure, Function, Facts | Britannica
    Lymphatic system, network of vessels and other tissues, including the tonsils, spleen, and thymus, that maintains fluid balance and fights infection Extracellular fluid in the lymphatic system is known as lymph Lymph contains disease-fighting cells called lymphocytes, which are supplied by the lymphatic system
  • Heart | Structure, Function, Diagram, Anatomy, Facts | Britannica
    The heart is an organ that serves as a pump to circulate the blood It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds
  • Human skeleton | Parts, Functions, Diagram, Facts | Britannica
    The human skeleton is the internal framework for the human body It consists of many individual bones and cartilages, as well as bands of fibrous connective tissue—the ligaments and the tendons—which serve in intimate relationship with the parts of the skeleton
  • Latissimus dorsi | Back, Shoulder, Arm | Britannica
    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
  • Smooth muscle | anatomy | Britannica
    Smooth muscle, muscle that shows no cross stripes under microscopic magnification It consists of narrow spindle-shaped cells with a single, centrally located nucleus Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically It constitutes much of the musculature of
  • Gastrocnemius muscle | Calf Muscle, Plantar Flexion, Movement . . .
    gastrocnemius muscle, large posterior muscle of the calf of the leg It originates at the back of the femur (thighbone) and patella (kneecap) and, joining the soleus (another muscle of the calf), is attached to the Achilles tendon at the heel Action of the gastrocnemius pulls the heel up and thus extends the foot downward; the muscle provides the propelling force in running and jumping





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