blink reflex nerve

The defecation reflex was a reflex action of the internal organs. When the feces fell into the anus, it would stimulate the wall of the anus. Through reflex, it would cause a series of wriggling movements in the descending colon, sigmoid colon, and anus. At the same time, it would relax the internal and external constrictors of the anus canal and contract the abdominal wall muscles, thus expelling the feces. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were two main aspects of the neural reflex process involved in farting. On the one hand, muscle contraction and pressure changes led to the nervous reflex when gas was discharged. When people laughed, the abdominal muscles contracted and the pressure changed. This change could push the gas in the intestine to the anus and discharge it. During this process, the nervous system regulated the muscle contraction and pressure changes, so that the gas in the intestine was discharged. On the other hand, the nerve reflex mechanism causes the anus to relax. Laughter, as an emotional response, can activate the autonomous nervous system, which may cause the muscles of the anus to relax, making it easier for the gas in the intestines to be discharged, resulting in farting. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Not all reflexes were located in the brain. Simple reflexes such as the knee jerk reflex had a low-level nerve center located in the gray matter of the spinal cord. The nerve center of complex reflexes was mainly located in the brain. The nerve center of conditioned reflexes was mainly located in the cerebral cortices and subcortices because these parts were the high-level nerve centers that participated in complex reflex activities. In the central nervous system, the nerve center was formed by the collection of nerve cells with the same function. Its role was to regulate the corresponding physiological activities of the human body. For some complex physiological functions, such as learning and quenching thirst, it required the high-level centers of the brain (such as the prefrontal lobe and limbic system of the cerebral cortexes) to participate in the transmission of nerve signals, analysis and synthesis, so as to connect the originally unrelated stimulation with a specific response. Therefore, the nerve center of complex reflexes was located in the brain. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Yes. The nerve center was distributed in various parts of the central nervous system, including the brain, spinal cord, marrow, pontine, midbrain, upper and lower hypochondrium, cerebrum, and other different nerve tissues. Reflex activity required the participation of the nerve center, so the nerve center of reflex was the brain. For example, the respiratory center existed in many parts of the brain, such as the oblongata, pontine, and even the cerebral cortices. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The adjustment reflex and the pupil's light reflex were two important physiological reflexes. The reflex of accommodation was a series of changes in the eyes in order to see nearby objects, such as the bulging of the lens, the narrowing of the pupils, and the convergence of the eyes. The pupil's light reflex was even more interesting. When light shone on one side of the eye, the illuminated pupil would shrink. This was the pupil's light reflex. It could protect the eyes from strong light and regulate the amount of light entering the eyes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>