Anatomy & Physiology: Current Research
Open Access

Abstract

The Physiology of the Human Microbiome and Host Interactions

Wei Chen

The human body exists as a complex biological ecosystem in which trillions of microorganisms coexist with host cells to maintain physiological balance. The human microbiome includes bacteria, microorganisms viruses, distributed fungi, across archaea different and other anatomical locations, particularly the gastrointestinal tract, skin, oral cavity and respiratory system. Recent advances in high throughput sequencing and computational biology have revealed that these microbial communities are not merely passive inhabitants but essential contributors to human physiology, influencing metabolism, immune function, development and disease susceptibility [1]. The gastrointestinal microbiome represents one of the most extensively studied microbial ecosystems due to its significant influence on host physiology. Intestinal microorganisms participate in digestion, nutrient metabolism, vitamin synthesis, and maintenance of intestinal barrier integrity. Microbial fermentation of dietary fibers produces Short Chain Fatty Acids (SCFAs), including acetate, propionate and butyrate, which serve as energy sources for intestinal cells and regulate immune responses [2]. These metabolites also influence glucose metabolism, lipid regulation and inflammatory pathways, demonstrating the importance of microbial activity in systemic physiology. Host microbiome interactions are mediated through continuous molecular communication between microbial communities and host tissues.

Published Date: 2025-10-01; Received Date: 2025-09-01