Describe the hormonal events surrounding parturition
What will be an ideal response
Fetal CRH secretion increases, which causes estrogen to rise as fetal ACTH triggers an increase in cortisol and DHEA. Placenta converts DHEA to estrogen. In turn, estrogen increases oxytocin receptors on uterine smooth muscle fibers and makes them form gap junctions. Oxytocin stimulates uterine contraction, and relaxin dilates the cervix and loosens the pubic symphysis. Estrogen also increases prostaglandins to digest collagen in the cervix. Oxytocin, cervix, and the hypothalamus maintain a positive feedback loop to maintain labor.
You might also like to view...
A sharps container is made of heavy plastic to ________________________________________
Fill in the blank(s) with correct word
The heart valves open and close due to
a. attachment to the heart muscle. b. a pressure difference on the two sides of the valve. c. Na+ and K+ fluxes during ventricular depolarization. d. turbulent flow in the atria and ventricles. e. none of these answers.
The length of the cardiac cycle is normally ________ second(s) in length
A) 2 B) 4 C) 0.8 D) 0.3
The portion of the sternum where CPR is performed is the xiphoid process.
Answer the following statement true (T) or false (F)