Which is the correct sequence of the components of a reflex arc?
A. Receptors à Muscles à Sensory neuron à Motor neuron àSpinal cord
B. Receptors à Motor neuron à Spinal cord à Sensory neuron àMuscle
C. Receptors à Spinal cord à Sensory neuron à Motor neuron à Muscle
D. Receptors àSensory neuronàSpinal cordà Motor neuron à Muscle
Answer:D
Which is the correct sequence of the components of a reflex arc?
A. Receptors à Muscles à Sensory neuron à Motor neuron àSpinal cord B. Receptors à Motor neuron à Spinal cord à Sensory neuron àMuscle C. Receptors à Spinal cord à Sensory neuron à Motor neuron à Muscle D. Receptors àSensory neuronàSpinal cordà Motor neuron à Muscle
Explanation: A stimulus received by the receptors present on skin, is transmitted to the sensory neuron which carries it to the central nervous system (the spinal cord and brain). A motor neuron carries the message from the central nervous system to the effector which could be a muscle, a gland or both.