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Related Concept Videos

Dietary Connections01:23

Dietary Connections

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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Introduction to Connective Tissues01:11

Introduction to Connective Tissues

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Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in an extracellular matrix (ECM) composed of a ground substance and three main types of protein fibers— collagen, elastic, and reticular fibers. The ground substance of connective tissues can range from a watery and jelly-like consistency to mineralized and hard. The wide variety of cells in the connective tissues include fibroblasts,...
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Classification of Connective Tissues01:30

Classification of Connective Tissues

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The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid connective tissues.
Connective Tissue Proper
Connective tissue proper is the most abundant class of connective tissues. As its name implies, it predominantly connects different tissues in the body. Depending on the cell types, ground substance, viscosity, and fiber types in the ECM, connective tissue proper is further categorized into loose and dense....
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Embryonic Connective Tissues01:20

Embryonic Connective Tissues

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During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development.
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Dense Connective Tissue01:13

Dense Connective Tissue

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Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
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Functions of Connective Tissues01:17

Functions of Connective Tissues

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Connective tissues perform a broad range of functions in the body. Their primary function is to connect and link different tissues in the body and act as packaging material between tissues. The areolar tissue, a connective tissue prototype, commonly cements various tissue types in diverse body organs. In contrast, adipose tissue cushions internal organs while insulating the body from heat loss.
Hard connective tissues, such as bones and cartilage, provide structure and support to the body.
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Related Experiment Video

Updated: Feb 6, 2026

Historical View and Physiology Demonstration at the NMJ of the Crayfish Opener Muscle
11:56

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Darwin and Mendel: The Historical Connection.

Yongsheng Liu1

  • 1Henan Collaborative Innovation Center of Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China; Department of Biochemistry, University of Alberta, Edmonton, AB, Canada.

Advances in Genetics
|August 21, 2018
PubMed
Summary

Charles Darwin

Area of Science:

  • Genetics and Evolutionary Biology
  • Plant Hybridization Studies

Background:

  • Charles Darwin's extensive experiments in plant hybridization laid groundwork for understanding inheritance.
  • Darwin described 'prepotency' (now dominance) and proposed Pangenesis theory.
  • Recent discoveries on small RNAs support Darwin's Pangenesis concept.

Purpose of the Study:

  • To re-evaluate Charles Darwin's foundational contributions to the field of genetics.
  • To highlight the historical influence of Darwin's work on Gregor Mendel.
  • To argue for Darwin's recognition as a key pioneer in genetics.

Main Methods:

  • Review of Darwin's cross- and self-pollination experiments.
  • Analysis of historical records on Mendel's engagement with Darwin's theories.
Keywords:
DarwinDominanceHybridizationMendelPrepotencySmall RNAs

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  • Examination of modern genetic discoveries in relation to Darwin's Pangenesis.

    • Main Results:

    • Darwin's work significantly advanced the knowledge of hybridization and inheritance.
    • Evidence suggests Mendel was influenced by Darwin's 'The Origin of Species'.
    • Darwin's Pangenesis theory finds modern support through small RNA research.

    Conclusions:

    • Darwin's contributions to genetics, including Pangenesis, have been historically undervalued.
    • Mendel's foundational role in genetics is being re-examined in light of Darwin's influence.
    • Charles Darwin should be recognized as a major pioneer in genetics.