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Ch. 13 The Peripheral Nervous System
Amerman- Human Anatomy & Physiology 3e
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
Capitolo 13, Problema 17c

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
c. A flexion reflex is a monosynaptic reflex with only one synapse in the spinal cord.

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1
Understand the definition of a flexion reflex: A flexion reflex is a type of withdrawal reflex that causes a limb to withdraw from a painful stimulus. It is a polysynaptic reflex, meaning it involves multiple synapses in the spinal cord.
Review the term 'monosynaptic reflex': A monosynaptic reflex involves only one synapse between a sensory neuron and a motor neuron, such as the stretch reflex (e.g., the patellar reflex).
Compare the characteristics of a flexion reflex and a monosynaptic reflex: A flexion reflex involves interneurons in the spinal cord, which means it is polysynaptic, not monosynaptic.
Evaluate the statement: The statement 'A flexion reflex is a monosynaptic reflex with only one synapse in the spinal cord' is false because a flexion reflex is polysynaptic, not monosynaptic.
Correct the false statement: The corrected statement is 'A flexion reflex is a polysynaptic reflex that involves multiple synapses in the spinal cord.'

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Flexion Reflex

The flexion reflex is a protective reflex that causes a rapid withdrawal of a limb from a painful stimulus. It involves multiple synapses and is typically classified as a polysynaptic reflex, meaning it includes at least one interneuron between the sensory and motor neurons, allowing for a more complex response.
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3:37
Stretch Reflex

Monosynaptic vs. Polysynaptic Reflexes

Monosynaptic reflexes involve a direct connection between a sensory neuron and a motor neuron, resulting in a quick response, such as the knee-jerk reflex. In contrast, polysynaptic reflexes involve one or more interneurons, which can integrate multiple signals and produce a more coordinated response, as seen in the flexion reflex.
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3:37
Stretch Reflex

Spinal Cord Function

The spinal cord serves as a critical pathway for transmitting signals between the brain and the rest of the body. It plays a key role in reflex actions, where sensory information is processed locally to produce immediate responses without the need for brain involvement, thus facilitating quick reactions to stimuli.
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06:04
Functional Groups
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