Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Ligaments are connective tissues that stabilize joints by linking bones to other bones. Tendons connect muscles to bones.
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Some amphibians have strong regenerative ability, including limb regeneration. This involves coordinated growth, nerves, and tissues rather than simple wound closure.
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Nerve impulses travel rapidly along specific pathways and act on targeted cells. Endocrine signals are often slower and distributed through blood or body fluids.
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Skeletons help support body weight and maintain posture. This is separate from digestion, excretion, or immune memory.
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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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Posture is maintained by skeletal support plus continuous or reflex muscle activity. Bones alone cannot hold normal posture without muscular control.
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Chemical synapses depend on neurotransmitter release from the presynaptic neuron. Without release, the next neuron or effector receives little or no signal.
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Calcium salts are important for mineralization and hardness of vertebrate bone. Poor mineral availability can weaken skeletal strength and normal support.
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In many soft-bodied invertebrates, the integument protects the body and also allows cutaneous gas exchange when it remains moist. It is not only a covering; it contributes directly to physiological exchange with the environment.
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Cilia are cell surface organelles that create movement or water currents by coordinated beating. This differs from movement produced by muscles pulling on skeletons.
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Fish scales form a protective body covering and reduce drag during swimming. Their structure is related to protection and movement efficiency, not digestion, circulation, or immunity production.
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Feathers are integumentary derivatives involved in flight, thermal insulation, waterproofing in many birds, and communication or display. They do not replace the skeleton or act as a blood-clotting system.
