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**E.g. long and segmented, short and squat etc.
**E.g. long and segmented, short and squat etc.
*Hairs sometimes present
*[[Hair - Anatomy & Physiology|Hairs]] sometimes present
*Aristae (bristles) sometimes present
*Aristae (bristles) sometimes present
*Insects usually posess two pairs of wings
*Insects usually posess two pairs of wings
*Diptera have a reduced second pair of wings called halteres for balance
*Diptera have a reduced second pair of wings called '''halteres''' for balance
*Membranous outgrowth of the integument
*Membranous outgrowth of the integument
*Strengthened by a network of veins comprising breathing tubes (trachea) and blood vessels
*Strengthened by a network of veins comprising breathing tubes ([[Trachea - Anatomy & Physiology|trachea]]) and [[Vascular System - Anatomy & Physiology|blood vessels]]
*The wing venation can be used for identification
*The wing venation can be used for identification
====Respiratory System====
====Respiratory System====
*Branching trachea strengthened by spial thickenings in the walls
*Branching [[Trachea - Anatomy & Physiology|trachea]] strengthened by spial thickenings in the walls
*Trachea communicate with outside via spiracles
*[[Trachea - Anatomy & Physiology|Trachea]] communicate with outside via spiracles
**Spiracles on side of body
**Spiracles on side of body
**Chitinous openings
**Chitinous openings
*Foregut:
*Foregut:
**Oesophagus
**[[Oesophagus - Anatomy & Physiology|Oesophagus]]
**Crop for temporary food storage
**[[Crop- Anatomy and Physiology|Crop]] for temporary food storage
**Proventriculus
**[[The Proventriculus - Anatomy & Physiology|Proventriculus]]
**Gizzard present in insects which eat solid food
**[[The Gizzard - Anamtomy & Physiology|Gizzard]] present in insects which eat solid food
***Muscular wall and teeth on inner surface
***Muscular wall and teeth on inner surface
====Circulatory System====
====Circulatory System====
*Heart situated dorsally
*[[Heart - Anatomy & Physiology|Heart]] situated dorsally
**Valves divide heart into compartments
**Valves divide [[Heart - Anatomy & Physiology|heart]] into compartments
**Valves only let blood flow forwards
**Valves only let blood flow forwards
*Aorta
*[[The Aortic Arches - Anatomy & Physiology|Aorta]]
*Branching blood vessels
*Branching [[Vascular System - Anatomy & Physiology|blood vessels]]
*Haemocoele
*Haemocoele
**Equivalent to the capillary circulation in mammals
**Equivalent to the capillary circulation in mammals
*Ostia (openings) in the blood vessel walls allow return of blood to the heart
*Ostia (openings) in the [[Vascular System - Anatomy & Physiology|blood vessel]] walls allow return of blood to the heart
====Nervous System====
====Nervous System====
*Small brain above the oesophagus
*Small brain above the [[Oesophagus - Anatomy & Physiology|oesophagus]]
*Chain of fused ganglia running along the floor of the abdomen and thorax
*Chain of fused ganglia running along the floor of the abdomen and thorax