Homeostasis Cases Read through each case. Fill in the blanks/spaces below based on the content of the cases. Case #2: A woman is in labor. The size of the fetus

Homeostasis Cases Read through each case. Fill in the blanks/spaces below based on the content of the cases. Case #2: A woman is in labor. The size of the fetus combined with the contractions of the uterine muscular layer stretches the uterine wall, stimulating stretch receptors in the cervix. Signals from these receptors are conducted through nerves to the hypothalamus/posterior pituitary. The hypothalamus/posterior pituitary releases oxytocin. The oxytocin travels through the blood and stimulates the smooth muscle layer of the uterus. Oxytocin has two effects on the uterine smooth muscle: It directly stimulates the smooth muscle to contract more frequently and more forcefully. It causes the uterine wall to release prostaglandins, which increase the frequency and force of the contractions even more. These effects push the fetus more forcefully into the cervix, stimulating the stretch receptors further. The receptors send additional impulses to the hypothalamus/posterior pituitary. The increased activation of the hypothalamus/posterior pituitary stimulates the release of additional oxytocin, which further stimulates the uterus. This cycle of activation continues until the fetus is expelled from the uterus. is the stimulus of this control loop?______________ is the control center?__________________________ is the effector? _______________________________ This is an example of __________ (positive / negative) feedback. How could you tell?

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