Explain the three positive feedback loops in the female reproductive system
What will be an ideal response?
Ans:
a. The hormone Estradiol, a form of estrogen starts rising as follicle develops in the ovaries, during the menstrual cycle. Progesterone also rises up. After the 14th day of the cycle , the estrogen hormone has a positive feedback effect, where it doesnt suppress the gonadotropin release.This results in increase in LH levels, leading to egg release.
b. The hormone oxytocin secreted by posterior pituitary, stimulates the contractions in labor. The hormone oxytocin stimulates the secretion of prostaglandins, in a positive feedback loop, which stimulates the secretion of prostaglandins from fetal membranes. These prostaglandins also enhance uterine contractions ,during child birth.
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a. True b. False Indicate whether the statement is true or false
What structure contains the receptor cells for hearing?
What will be an ideal response?
Suppose you are on a spinning ride at an amusement park. As you whirl around and around with your eyes closed, you sense the rotation by means of which of the following?
A. Cochlea B. Macula sacculi C. Semicircular ducts D. Organ of Corti E. Macula utriculi
ANS: B Merkel cells possess intracellular vesicles that resemble those of synapses and furthermore contact sensory nerve endings adjacent to the stratum basale. They have been shown to react to mechanical stimulation
a. Labial glands b. Palatine glands c. Parotid glands d. Sublingual gland e. Submandibular gland