Receptor
Explication
Receptors are specialized structures that detect stimuli and convert them into nerve messages, making them fundamental in nervous system functioning. Neurons transmit messages but do not convert stimuli; effectors produce responses, and synapses are junctions for transmission between neurons.
By tracing the transmission of nerve impulses from the cochlea to the auditory cortex to identify where the pathway may be blocked or damaged
Explication
Understanding the auditory pathway's role in transmitting impulses from the cochlea to the auditory cortex allows audiologists to identify where a disruption may occur—whether in the outer ear, middle ear, inner ear, or neural pathways—thus facilitating accurate diagnosis and targeted treatment of hearing impairments.
Discovery of the reflex arc as a neural pathway, understanding of action potentials, then coding stimulus in frequency
Explication
The scientific understanding developed first with the identification of the reflex arc as a neural pathway mediating automatic responses. Later, the generation and properties of action potentials were elucidated, and finally, the concept that the frequency of these impulses encodes stimulus intensity was established. Therefore, the correct chronological order is: discovery of the reflex arc, understanding of action potentials, then coding in frequency.
20 milliseconds
Explication
The content states that the latency time between the stimulus and the muscle response in the myotatic reflex is about 20 milliseconds, which indicates spinal cord mediation without involving the brain.
Inhibitory interneurons suppress motor neuron activity to prevent muscle contraction, while excitatory neurons activate motor neurons to cause muscle contraction.
Explication
Inhibitory interneurons in reflex circuits serve to suppress the activity of motor neurons to antagonistic muscles, thereby preventing unwanted contraction, whereas excitatory neurons stimulate motor neurons to induce muscle contraction. This distinction is fundamental to the coordination of muscle activity during reflexes.
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Nervous system — function?
Transmits signals to coordinate responses.
Auditory pathway — structures?
Outer ear, middle ear, cochlea, auditory nerve.
Reflex arc — purpose?
Enables quick, involuntary responses.
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