41-1/Which of the following changes occurs during defecation? Select one: a. Predominance of segmentation contractions _ b. Contraction...

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41-1/Which of the following changes occurs during defecation?
Select one:
a. Predominance of segmentation contractions _
b. Contraction of external anal sphincter
C. Reduction of intra-abdominal pressure
d. Relaxation of internal anal sphincter

2/When does the process of spermatogenesis start? Select one:_
a. At puberty
b. After the first division of spermatogonia
C. In the mother's womb
d. Immediately after birth

3/Which of the following thalamic nuclei is the site ofsynapse between second and third order neurons in somatic sensationpathways?
Select one:
a. Anterolateral nucleus
b. Ventral posterior nucleus
c. Dorsolateral nucleus
d. Lateral geniculate body

4/Which of the following physiological parameters willdecrease in a young man who is exercising for 2 hours outside inhot summer weather?
Select one: _
a. Heart rate _
b. Urination
C. Cutaneous blood flow
d. Metabolic rate

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3.8 Ratings (525 Votes)

answer 411 option b during defaecation feacal matter store in rectum ampullaas rectum got full of waste materialit expand and activate stretch receptor of rectal wallswhich stimulate desire to defaecate which cause contraction of rectal muscle relaxaation of internal anal sphincter and initial contraction of external anal sphincterif this urge wont fulfill reverse peristalsis occur and water absorbed faecal matter stored till next peristalsis when next peristalsis See Answer

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