A reflex is a rapid, involuntary response to a stimulus. A reflex arc is the pathway traveled by the nerve impulses during a reflex.
Most reflexes are spinal reflexes with pathways that traverse only the spinal cord. During a spinal reflex, information may be transmitted to the brain, but it is the spinal cord, and not the brain, that is responsible for the integration of sensory information and a response transmitted to motor neurons.
Information is sent to the brain but that takes awhile longer. It is best if you remove your hand from the fire as fast as possible and not wait until the brain yells "hot, hot!".
knee jerk aka patellar reflex is an example of a stretch reflex
knee-jerk reflex
Reflex
the knee-jerk reflex
The knee-jerk reflex is a common example of a reflex. It occurs when the knee is tapped and the leg kicks out involuntarily in response.
knee jerk reflex
Patellar reflex is an involuntary, deep tendon and myotatic reflex
Stretch reflex that helps keep your knees from buckling
The patellar reflex is a type of stretch reflex that involves tapping the patellar tendon to elicit a contraction of the quadriceps muscle and extension of the knee. This reflex helps to maintain balance and stability.
The statement "The patellar knee jerk reflex is controlled by the brain" is not correct. The patellar knee jerk reflex is actually a spinal reflex, meaning it does not involve the brain in its initial response.
The knee-jerk reflex is controlled by the interneurons in the spinal cord.
The simplest reflex is a monosynaptic reflex, which involves only two neurons: a sensory neuron and a motor neuron. An example of this is the knee-jerk reflex, where tapping the knee causes a quick, automatic extension of the leg.