The chronological order of the response brought about by the nervous system is as follows.
1. Sensory receptors in the arteries detect low oxygen levels.
2. Sensory neurons generate an impulse.
3. The central nervous system relays an impulse to certain brain regions.
4. The brain sends signals through motor neurons.
5. Isabel's breathing rate increases.
The response to a stimulus is called a reflex action and the pathway traveled by the reflex action is called the reflex arch. A reflex action is an automatic involuntary response to a stimulus which minimizes any damage to the body. During conditions of low levels of oxygen in the body, the receptors detect the stimulus of low oxygen levels which could pose a threat to the individual and sensory neurons generate an impulse. It reaches the central nervous system and then the brain. In turn, brain sends signals through the motor neurons that carry a message and help in increasing the breathing rate of Isabel.
The term meaning situated nearest the midline or beginning of a body structure is proximal. Proximal is a medical term frequently used to mention to the distance of a body part such as shoulder, elbow, wrist, hand, fingers etc. in respects to its contiguity from the center of the body, normally the torso. In most circumstances, torso as the center point and the arms and legs as connections that prolong from the center. The further away an attachment or body part is from the center shoulder, elbow, wrist, hand, fingers the more distal it is and the closer the body part is to the center the more proximal it is. Therefore, when looking at the center of the human body, the shoulder is proximal in closer proximity to the torso when related to the elbow which is further away.
