: Skeletal muscles (striated) are responsible for voluntary movements, while smooth muscles control internal organs and are involuntary.
: Bones grow in length through the division of cartilage cells and in thickness through the periosteum (the outer membrane). Muscular System and Movement gdz po biologii 8 klass r.t opora i dvizhenie onlain sonin
: Bones are made of organic substances (which provide flexibility) and inorganic minerals like calcium (which provide hardness). : Skeletal muscles (striated) are responsible for voluntary
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: Functions as a support frame, protects internal organs, and allows for movement. It consists of the skull, spinal column, rib cage, and the skeleton of the upper and lower limbs.
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: Muscle fatigue is caused by the accumulation of metabolic waste (like lactic acid) and the depletion of energy stores during prolonged physical activity. Health and Posture