During life in utero,oxygenation of the fetus occurs through transplacental gas exchange.When birth occurs,four factors combine to stimulate the respiratory center in the medulla.The initiation of respiration then follows.What are these four essential factors? (Select all that apply. )
A) Chemical
B) Mechanical
C) Thermal
D) Psychologic
E) Sensory

Question

Quizplus · Accepted Answer

The four essential factors that stimulate the respiratory center in the medulla are chemical (changes in blood gases such as increased carbon dioxide levels), mechanical (pressure changes during delivery), thermal (cooling of the newborn after delivery), and sensory (stimulation of tactile receptors during delivery). Therefore, choices A, B, C, and E are correct. Choice D (psychologic) is not directly related to the stimulation of the respiratory center and is therefore not correct.

During Life in Utero,oxygenation of the Fetus Occurs Through Transplacental