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Is anus the site of initiation of the defecation reflex?
Yes. The anus is actually composed of a few different elements that contribute to the defecation reflex. First, the anal canal is at the lower end of the rectum and is the temporary storage place for feces. When enough feces is in the canal, the pressure triggers the internal anal sphincter (circular muscle) to send a signal to the brain that you need to defecate. If it is not convenient to do so at the time, the external anal sphincter prevents the feces from exiting the anus and suppresses the urge to defecate. This may occur several times until the inevitable happens and the external sphincter has to allow the internal to let go, and voila, another defecation occurs.
Where does occur the the autonomic reflex centers?
The autonomic reflex centers are located in the brainstem and spinal cord. The brainstem houses important autonomic centers such as the medulla oblongata and pons, which regulate functions like heart rate and respiration. The spinal cord contains reflex arcs that control activities like urination and defecation.
What are the promoter and initiation site?
The promoter is a specific DNA sequence located upstream of a gene that serves as a binding site for RNA polymerase and transcription factors, initiating the transcription process. The initiation site, often referred to as the transcription start site (TSS), is the precise location on the DNA where RNA polymerase begins synthesizing RNA. Together, the promoter and initiation site ensure that genes are expressed at the right time and in the right amount.
During the initiation step of translation the fMet charged tRNA assembles in which site of the ribosome?
During the initiation step of translation, the fMet-charged tRNA assembles in the P site of the ribosome. This site accommodates the first aminoacyl-tRNA, which carries the modified methionine (fMet) in prokaryotes. The initiation complex then facilitates the proper alignment of the mRNA and the start codon, allowing translation to commence.
What triggers defecation reflex?
The internal anal sphincter is governed by involuntary control, so it is reflexive. It is what triggers the feeling that you have to defecate. However, the external sphincter is under voluntary control. So, if you feel that you have to defecate, you can continue to hold your external sphincter shut, until the urge to defecate diminishes. Then, when it is convenient to do so, the internal sphincter again activates the urge to defecate. The anal sphincter has an internal involuntary part, and an external voluntary part. The internal sphincter has an involuntary reflex which gives your the urge to defecate. If it is not convenient to defecate, then the external sphincter, which is under voluntary control, keeps the anus shut, and after a while, the urge to defecate can subside until a later time when it is convenient to defecate.
Is anus the site of initiation of the defecation reflex?
Yes. The anus is actually composed of a few different elements that contribute to the defecation reflex. First, the anal canal is at the lower end of the rectum and is the temporary storage place for feces. When enough feces is in the canal, the pressure triggers the internal anal sphincter (circular muscle) to send a signal to the brain that you need to defecate. If it is not convenient to do so at the time, the external anal sphincter prevents the feces from exiting the anus and suppresses the urge to defecate. This may occur several times until the inevitable happens and the external sphincter has to allow the internal to let go, and voila, another defecation occurs.
When feces are forced into the rectum by mass movements and the wall of the rectum becomes stretched what reflex is initiated?
The defecation reflex is initiated by stretching of the wall of the rectum. This reflex facilitates expulsion of feces through the anus.
The integration centers for defecation and urination reflexes are in the?
The integration centers for the defecation reflex are in the sacral region of the spinal cord and involve the parasympathetic nervous system. The integration centers for the urination reflex are in the spinal cord and brainstem, coordinating signals between the bladder, urethra, and brain to control the process of urination.
What is the duodenocolic reflex?
The duodenocolic reflex is a gastrocolic reflex that occurs when food enters the duodenum, triggering a reflex response in the colon to promote defecation. This reflex helps facilitate the movement of waste through the digestive system by increasing colonic motility.
Which of the following is a feature of the muscular actions of digestion?
Peristalsis begins first in the stomach upon the initiation of the swallowing reflex
Is defecating a form of positive feedback?
Answered by, Respicius Rwehumbiza at the University of DodomaYes, defecating a form of positive feedback.Rectal contraction at defecation is suggested to be maintained by positive anorectal feedback evoked by continuous passage of stool through the rectal neck. This feedback appears to be affected through an anorectal excitatory reflex (ARR), which produces rectal contraction upon stimulation of anal stretch receptors. Abortion of this reflex by anal anesthetization seems to result in failure of the rectum to contract and in excessive straining to achieve rectal evacuation. ARR thus is suggested to be a second defecation reflex necessary to continue defecation, whereas the rectoanal inhibitory reflex is the primary reflex.
Where does occur the the autonomic reflex centers?
The autonomic reflex centers are located in the brainstem and spinal cord. The brainstem houses important autonomic centers such as the medulla oblongata and pons, which regulate functions like heart rate and respiration. The spinal cord contains reflex arcs that control activities like urination and defecation.
Do moles defecate in their own tunnels underground?
Yes, they have their own designated 'site of defecation'. Sort of like a restroom.
During the initiation step of translation the fMet charged tRNA assembles in which site of the ribosome?
During the initiation step of translation, the fMet-charged tRNA assembles in the P site of the ribosome. This site accommodates the first aminoacyl-tRNA, which carries the modified methionine (fMet) in prokaryotes. The initiation complex then facilitates the proper alignment of the mRNA and the start codon, allowing translation to commence.
What triggers defecation reflex?
The internal anal sphincter is governed by involuntary control, so it is reflexive. It is what triggers the feeling that you have to defecate. However, the external sphincter is under voluntary control. So, if you feel that you have to defecate, you can continue to hold your external sphincter shut, until the urge to defecate diminishes. Then, when it is convenient to do so, the internal sphincter again activates the urge to defecate. The anal sphincter has an internal involuntary part, and an external voluntary part. The internal sphincter has an involuntary reflex which gives your the urge to defecate. If it is not convenient to defecate, then the external sphincter, which is under voluntary control, keeps the anus shut, and after a while, the urge to defecate can subside until a later time when it is convenient to defecate.
What's the meaning of defecation?
The meaning of defecation is when feces is discharged from the body.
What is the difference between excretion and defecation?
The difference between excretion and defecation is excretion is the removal of waste and defecation is the removal of undigested waste. During defecation, the nutrients are absorbed by the body before being removed from the body.
