Which is the correct order of sequences during the knee-jerk reflex?
Correct answer: A. Patella tendon stretches - sensory neuron - spinal cord - motor neuron - quadriceps contract
- A. Patella tendon stretches - sensory neuron - spinal cord - motor neuron - quadriceps contract
- B. Patella tendon stretches - spinal cord - sensory neuron - motor neuron - quadriceps contract
- C. Patella tendon stretches - sensory neuron - spinal cord -brain - motor neuron - quadriceps contract (reflex bypasses the brain)
- D. Quadriceps stretch - sensory neuron - spinal cord - motor neuron - patella tendon contracts
Explanation
During the knee-jerk reflex, the neural signal is initiated by the stretching of the patella tendon, which is transmitted via sensory neuron to the spinal cord. In turn, the signal is transmitted to the motor neuron, resulting in the contraction of quadriceps. Most importantly, the reflex bypasses the brain, allowing a speedy reaction of the body to the stimulus.
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Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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