a reflex action is an automatic, involuntary, and quickresponse that is done without the interference of the brain. This reflex is adapted to a goal which is to escape any danger. it is for protection.
pathway of reflex action
stimulus --> sense organ: receiving surface (receptors) --> spinal cord --> effector organ: a muscle or a gland --> response
label the following reflex arc
the sensory neuron is a unipolar neuron and the motor neuron is a multipolar neuron
the cell body of the sensory neuron is located in the spinal ganglion. and the spinal ganglion is located in the posterior root
the sensory nerve fiber is a dendrite and the motor nerve fiber is an axon
to differentiate between a dendrite and an axon, the reference is the cell body.
to differentiate between sensory and motor pathways, the reference has to be the spinal cord.
sensory= towards
motor= away
the cell body of the motor neuron is located in the anterior root in the grey matter.
motor end plate is the gap between the motor neuron and the muscle
interneuron connects the sensory neuron to the motor neuron. its located in the gray matter of the spinal cord
the elements that make up a reflex arc:
receptor
sensory neuron
spinal cord (reflex center)
motor neuron
muscle
nervous message is unidirectional means that it propagates in one direction.
