Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Tendons contain dense collagen fibers. This structure resists tension and transfers force from muscles to bones or other hard parts.
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Large terrestrial animals need strong support systems to resist gravity, maintain posture, and permit locomotion. Skeletons distribute mechanical loads across the body.
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The axon carries nerve impulses away from the neuron cell body. Dendrites mainly receive signals, while synapses allow communication with other cells.
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Jointed appendages permit controlled walking and balance in arthropods. Losing a leg disrupts mechanical coordination even if other systems continue working.
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Annelids rely on fluid-filled compartments and muscle contractions, whereas arthropods rely on a rigid external cuticle with jointed appendages.
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The femur is an internal bone of the vertebrate endoskeleton. Fish scales are external protective structures, not limb bones.
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Myelin forms an insulating sheath around many axons and allows faster saltatory conduction. Damage to myelin slows or disrupts nerve signaling.
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Hydrostatic skeletons use fluid pressure inside body cavities to support soft tissues. Annelids are a standard example because their coelomic fluid works with muscles during movement.
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Many limb movements depend on antagonistic muscle pairs. One muscle shortens while the opposing muscle relaxes, allowing controlled movement in opposite directions.
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Vertebrate bone stores calcium salts and phosphate, which give hardness and structural strength. Mineral storage is an additional skeletal function.
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Reflex arcs can process information through the spinal cord or local neural circuits, producing rapid protective responses before conscious perception.
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Tendons are tough connective tissues that attach muscles to bones. They transmit contractile force so bones move at joints.
