Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Stretch receptors and proprioceptors give feedback about muscle length and body position. This information helps maintain coordinated movement.
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The inner ear contains balance organs that detect head movement and position. Damage can disrupt equilibrium and coordination.
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Sensory adaptation is reduced responsiveness during continuous stimulation. It allows animals to remain sensitive to new or changing stimuli.
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Sensory cells generally require a minimum stimulus intensity before producing a receptor potential strong enough to signal the nervous system.
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In aquatic environments, vibrations and water movements can reveal prey even in darkness. A lateral line is specialized for this mechanosensory task.
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The lateral line detects water displacement, allowing fishes to respond quickly to pressure waves from predators, prey, or obstacles.
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The central nervous system receives and integrates sensory signals, then coordinates behavior and physiological responses through motor pathways.
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Annelids have a more centralized nervous system with ganglia and nerve cords. This supports coordinated segmental movement and sensory responses.
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Cnidarians have diffuse nerve nets rather than highly centralized brains. This arrangement coordinates simple movements and responses in radially symmetrical bodies.
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At many neuromuscular junctions, acetylcholine transmits the signal from motor neuron to muscle. Blocking its receptors prevents normal contraction.
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Action potentials involve voltage-gated ion channels that change sodium and potassium movement across the axon membrane. This produces a traveling electrical signal.
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Resting membrane potential depends on unequal ion distribution and selective membrane permeability. Sodium-potassium pumps help maintain these gradients.
