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17 August, 02:22

Childbirth in mammals is an example of endocrine-controlled negative feedback, because the production of oxytocin during childbirth results in additional oxytocin being synthesized by the posterior pituitary gland. A. True B. False

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Answers (2)
  1. 17 August, 02:45
    0
    False

    Explanation:

    Negative feedback mechanisms act like a thermostat in the

    home. As the temperature rises (deviation from the ideal normal

    value), the thermostat detects the change and triggers the air-

    conditioning to turn on and cool the house. Once the

    temperature reaches its thermostat setting (ideal normal value),

    the air conditioning turns off.

    In negative feedback, the response will reverse or cause the

    opposite effect of the original stimulus. Negative feedback can

    be explained with the process of insulin production and

    release. After a meal the blood sugar level will be elevated due

    to the absorption of sugars from the digestive tract. This

    triggers the release of insulin from pancreas. Insulin converts

    sugar into cells and hence the blood sugar level drops. This

    low blood sugar level will result in the cessation of insulin

    release. This insulin response is a negative feedback. Most

    endocrine glands are under the control of negative feedback

    mechanisms

    Positive feedback mechanisms are rare. It amplifies changes

    rather than reversing them. The release of oxytocin from the

    posterior pituitary gland during labor is an example of positive

    feedback mechanism. Oxytocin stimulates the muscle

    contractions that push the baby through the birth canal. The

    release of oxytocin result in stronger or augmented contractions

    during labor. The contractions intensify and increase until the

    baby is outside the birth canal. When the stimulus to the

    pressure receptors ends, oxytocin production stops and labor

    contractions cease.

    Positive feedback mechanisms control self-perpetuating events

    that can be out of control and do not require continuous

    adjustment. In positive feedback mechanisms, the original

    stimulus is promoted rather than negated. Positive feedback

    increases the deviation from an ideal normal value.
  2. 17 August, 02:45
    0
    B. False

    Explanation:

    Child-birth in mammals is not an example of endocrine-controlled negative feedback, because the production of oxytocin during childbirth doesn't result in additional oxytocin being synthesized by the posterior pituitary gland.

    Oxytocin is the enzyme which is necessary at the time of birth in order to contract the walls of the uterus and expel the baby out of the body. Oxytocin levels rise at the onset of labour, causing regular contractions of womb and abdominal muscles. Oxytocin induced contractions become stronger and more frequent without the influence of progesterone and estrogen, which at high levels prevent labour.
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