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Reflex arcs are formed in which part of the nervous system?
Medulla
Fore brain
Spinal cord
Cerebellum
Spinal cord
Reflex arcs are formed in the spinal cord, which allows for immediate, involuntary responses to stimuli without having to wait for processing by the brain. This rapid pathway involves a sensory neuron, an interneuron (in most cases), and a motor neuron.
Reflex arcs are formed in the spinal cord, which allows for immediate, involuntary responses to stimuli without having to wait for processing by the brain. This rapid pathway involves a sensory neuron, an interneuron (in most cases), and a motor neuron.
Touching a hot iron causes you to instantly pull your hand away even before your brain registers the sensation of pain; this fast detour happens entirely through the spinal cord.
Remember the path: 'Sensory goes In, Motor goes Out' (SIMO).
Receptor \rightarrow Sensory Neuron \rightarrow Spinal Cord \rightarrow Motor Neuron \rightarrow Effector
When a sensory receptor is stimulated, it generates an electrical impulse that travels via sensory (afferent) neurons to the spinal cord. Within the gray matter of the spinal cord, the signal is transmitted directly or via interneurons to motor (efferent) neurons. The motor neuron carries the impulse to an effector organ (such as a muscle or gland) to produce a quick, automatic response.
Reflex actions are sudden, involuntary responses to external stimuli.
The pathway taken by nerve impulses in a reflex action is called a reflex arc.
Most reflex arcs are processed in the spinal cord to minimize reaction time and prevent severe injury.
The brain is informed of the reflex action simultaneously or after the response has already occurred.
Extremely fast response time protecting the body from immediate harm
Reduces the load on conscious brain processing for routine survival reactions
Lacks conscious control or prior deliberation
Knee-jerk reflex
Withdrawal reflex from hot surfaces or sharp objects
Pupillary light reflex
Medulla: Controls involuntary actions like breathing, heartbeat, and blood pressure, but not reflex arcs.
Forebrain: Main thinking part of the brain; handles voluntary actions, sensory processing, and learning.
Cerebellum: Responsible for precision of voluntary actions and maintaining posture and balance.
C is correct тАФ Reflex arcs are formed in the spinal cord for rapid, involuntary responses.
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