ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
ENDOCRINE ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which is an example of a NEGATIVE feedback loop
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Oxytocin release increases uterine contraction, which results in more oxytocin release. This cycle continues until the baby is born.
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Fruit are signaled to ripen by the production of ethylene gas by the plant. As they ripen, the fruit begin to produce ethylene gas, which, in turn ripens more fruit, causing the relase of more ethylene gas. Eventually all fruit are ripened.
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Blood pressure decreases, which causes the release of aldosterone by the adrenal glands. This hormone causes an increase in sodium levels in the blood. This increase in sodium causes fluid retention. As a result, blood pressure increases, and aldosterone release ceases
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Damage to a blood vessel signals platelets to become active. Active platelets release signals to nearby platelets, telling them to become active, and so on.
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Explanation:
Detailed explanation-1: -The release of aldosterone from the adrenal glands is regulated via the renin-angiotensin II-aldosterone system. This system is initially activated via a decrease in the mean arterial blood pressure to increase the blood pressure.
Detailed explanation-2: -Hyperkalaemia, not hypokalaemia, directly stimulates aldosterone secretion by the adrenal cortex.
Detailed explanation-3: -Aldosterone causes an increase in salt and water reabsorption into the bloodstream from the kidney thereby increasing the blood volume, restoring salt levels and blood pressure.
Detailed explanation-4: -Angiotensin II stimulates the synthesis and release of aldosterone from the zona glomerulosa (renin-angiotensin system).
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