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Related Concept Videos

Cellular Adaptation I: Introduction and Atrophy01:23

Cellular Adaptation I: Introduction and Atrophy

Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Cellular Adaptation II: Hypertrophy01:26

Cellular Adaptation II: Hypertrophy

Hypertrophy is the increase in the size of individual cells, resulting in the enlargement of a tissue or organ. Unlike hyperplasia, which involves an increase in cell number, hypertrophy is characterized by an increase in cell volume. This process often occurs in response to higher functional demand or hormonal stimulation, leading to the production of more structural proteins and organelles, thereby enhancing the cells' work capacity.There are two primary types of hypertrophy: physiological...
Life Histories01:29

Life Histories

Constrained by limited energy and resources, organisms must compromise between offspring quantity and parental investment. This trade-off is represented by two primary reproductive strategies; K-strategists produce few offspring but provide substantial parental support, whereas r-strategists produce much progeny that receives little care. These strategies are related to an organism’s survival likelihood across its lifespan, which is represented by a survivorship curve. Three general types of...
Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Cellular Adaptation III: Hyperplasia01:26

Cellular Adaptation III: Hyperplasia

Hyperplasia is an increase in the number of cells in a tissue or organ due to enhanced cell division. It is an adaptive, controlled response to stimuli such as injury, hormones, or stress, involving mitosis to produce genetically identical cells and support tissue repair and regeneration.Tissue CapacityCertain tissues, including the epidermis, intestinal epithelium, bone marrow, and fibroblasts, have a high potential for hyperplasia. Others, such as bone, cartilage, and smooth muscle, show...

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Related Experiment Video

Updated: Jun 14, 2026

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
10:08

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

Published on: May 18, 2022

Brain size, body size and longevity.

A Peters1, B Hitze, D Langemann

  • 1Medical Clinic 1, University of Luebeck, Luebeck, Germany. achim.peters@uk-sh.de

International Journal of Obesity (2005)
|March 31, 2010
PubMed
Summary

Body mass index (BMI) reflects body-brain-energy balance, indicating an individual's energy homeostasis. This biological variable suggests that higher BMI may correlate with better long-term health and longevity.

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Published on: October 1, 2011

Area of Science:

  • Integrative biology
  • Clinical medicine
  • Biometry

Background:

  • The relationship between body mass index (BMI) and longevity is a key clinical concern.
  • Body-brain allometry, the study of size relationships between body and brain, is a significant area in comparative biology.

Purpose of the Study:

  • To investigate the novel association between clinical body mass index (BMI) and comparative biological body-brain allometry.
  • To explore if BMI serves as a biological indicator of systemic energy homeostasis and its implications for future health outcomes.

Main Methods:

  • Comparative analysis integrating medical data on BMI and longevity with biological data on body-brain allometry.
  • Evaluation of the body-brain-energy balance as a systemic variable.

Main Results:

  • The study found a direct correlation between body mass index (BMI) and body-brain allometry.
  • Analysis supports the concept that BMI is a direct measure of the body-brain-energy balance.

Conclusions:

  • Body mass index (BMI) is a biological indicator of an individual's ability to maintain systemic energy homeostasis.
  • This homeostasis, reflected by BMI, suggests a positive correlation with an individual's likelihood of performing well and potentially living longer.