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Related Concept Videos

What is Homeostasis?01:16

What is Homeostasis?

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Maintaining homeostasis requires that the body continuously maintain its internal conditions. Each physiological condition has a particular set point, from body temperature to blood pressure to levels of certain nutrients. A set point is the physiological value around which the normal range fluctuates. A normal range is a restricted set of values that is optimally healthful and stable. For example, the set point for normal human body temperature is approximately 37°C (98.6°F).
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pH Homeostasis01:31

pH Homeostasis

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Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
Respiratory...
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Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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What is Population Genetics?01:25

What is Population Genetics?

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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Population Growth00:57

Population Growth

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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Revealing Electromechanical Control of Tissue Homeostasis Using a Two-Layer Microfluidic Device
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Population homeostasis.

J H Koeslag

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |February 11, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Subtle environmental and social factors, not just survival of the fittest, regulate animal and human population sizes. Research explores these less obvious population control mechanisms.

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    Area of Science:

    • Ecology
    • Demography
    • Behavioral Ecology

    Background:

    • Traditional views emphasize 'survival of the fittest' in hostile environments as the primary population control.
    • Mechanisms regulating animal population dynamics are a recent focus of scientific inquiry.
    • Understanding population control is crucial for ecological and societal balance.

    Purpose of the Study:

    • To examine the subtle, non-survival-driven forces that control population size.
    • To explore recently discovered mechanisms of population control in animal populations.
    • To investigate potential natural controls on human population dynamics.

    Main Methods:

    • Review of ecological and behavioral studies on animal population regulation.
    • Analysis of demographic data and trends.
    • Examination of theoretical models of population control.

    Main Results:

    • Population size is influenced by factors beyond direct environmental pressures.
    • Social behaviors and resource availability play significant roles in population regulation.
    • Evidence suggests complex interplay of factors, not solely natural selection, governs population dynamics.

    Conclusions:

    • Human population control likely involves intricate ecological and social mechanisms.
    • Further research is needed to fully elucidate these subtle regulatory forces.
    • Understanding these controls is vital for predicting future population trends.