Louisiana Horticulture Practice Test 2026 - Free Horticulture Practice Questions and Study Guide

Insects have a body structure that is divided into three distinct regions: the head, the thorax, and the abdomen. This tripartite division is a defining characteristic of their anatomy, setting them apart from other arthropods that may have different body segmentations.

The head houses critical sensory structures such as antennae, compound eyes, and mouthparts, while the thorax is primarily responsible for locomotion and is equipped with legs and, in many cases, wings. The abdomen contains vital organs for digestion, reproduction, and excretion.

This division into three regions is fundamental to understanding not only the physical structure of insects but also their physiology and behavior, which can vary significantly across different species based on adaptations related to these body regions.