Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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The rib cage protects the heart and lungs. Damage can threaten breathing and circulation because these organs lie within the thoracic cavity.
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The vertebrate skull protects the brain and important sensory organs. Skeletons provide both support and protection of delicate organs.
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Skeletal muscles normally require neural stimulation for contraction. Without nerve impulses, voluntary movement is reduced or absent.
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Movement is coordinated by the nervous system, executed by muscles, and supported by skeletal structures. These systems work together for effective locomotion.
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Jointed areas in the exoskeleton and internal muscle attachments allow arthropods to move appendages rapidly and precisely.
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Scales, feathers, and hair are body coverings derived from or associated with the integument. They illustrate protection and environmental adaptation.
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The integument protects against injury, pathogens, and water loss or gain. Without it, the body cannot maintain stable internal conditions effectively.
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Chitin, scales, and feathers are different body coverings, but all contribute to protection. Some also support movement, insulation, or display depending on the animal.
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Amoeba extends pseudopodia through changes in cytoplasm. This movement also helps engulf food by phagocytosis.
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Amoeboid movement uses cytoplasmic streaming and pseudopodia rather than muscle fibers. It is a cellular locomotion mechanism.
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Bones serve as levers and joints as fulcrums. Skeletal muscles provide the force for movement by contracting and pulling on bones.
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Ligaments are connective tissues that stabilize joints by linking bones to other bones. Tendons connect muscles to bones.
