After eating a meal high in calcium, blood calcium levels are returned to normal through the use of a negative feedback loop.
- Increased calcium levels in the serum serve as a negative-feedback loop signaling the parathyroid glands to stop the release of PTH.
- The mechanism of PTH in the body is intricate, and the clinical ramifications of irregularities are significant.
It involves regulation of the blood calcium level.
The parathyroid glands secrete parathyroid hormone, which regulates the level of calcium in the blood. If calcium decreases, the parathyroid glands sense the decrease and secrete more parathyroid hormone
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The correct answer is the control variable. For example, if you want to measure how men and women like cats, you would present the same cats to all the people (that;s the constant variables) and gender is your control variable.
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When geologists monitor a fault they look for changes in elevation tilting of land surface and ground movements.
Answer: a. Adaptive radiation of Euprimates.
Explanation:
Adaptive radiation is the swift diversification, from a single common ancestor, of a group of species consisting of members that exhibit a diverse array of adaptations and inhabit different ecological niches.
Climate is an important factor that determines where a species can inhabit or not. Daily and seasonal variations in temperature, annual cycles of precipitation, and larger change in climate shape adaptations of plants and animals may be considered in determining their survival. Changes in global and regional climates seemingly had profound effects on the evolutionary history and adaptive radiation of Euprimates.
A rapid temperature increase about 55 mya created tropical conditions globally that caused the adaptive radiation of Euprimates. Warm climates during the Eocene that resulted in plant diversity, created new environmental niches favorable for primates leading to the record of first major primate group: anthropoids, adapiforms, tarsiers, and omomyiforms.