Download The Insect Internally

The Insect Internally
Digestive System
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Insects possess a complete tube or
alimentary canal that takes in food
through an anterior mouth & breaks
down this food by enzymatic
hydrolysis.
Enzymes
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H20 + food
wastes
absorable molecules + enegry +
Enzymes
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Enzymes secreted are specific to the
diet of the individual.
Various glands to increase enzyme
production have also evolved.
Food
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Solid form
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Requires grinding prior to ingestion
Chambers are not located within the
insect body but outside. Preoral cavity
Liquid form

Narrowing of the tube & a crop off the
side of the esophagus
Circulatory System
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Insect blood comprising from 5 to 40
percent of weight.
Red blood cells are absent.
The heart is located in the abdomen.
The aorta goes from the heart to the
brain first then to the legs and wings
along the alimentary canal.
Tracheal system & Respiration
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Problem with O2 uptake
A waterproof exoskeleton
O2 molecule is larger than H20
There is insufficient surface area for
effective uptake of Oxygen.
Thus, the surface area for oxygen uptake
comes from an extensive invagination of
tubes – Tracheae
Oxygen enters the body via spiracles into
the tracheae then directly to body tissues.
Muscular System

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Can make up to 60% of the body
Used for all types of movement of the
insect.
Excretory System

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This systems rids the body of all biproduct molecules such as protein
wastes.
They must detoxify wastes to prevent
bodily damage prior to evacuation by
combining them with other substances
unless large amount of water are
present to dilute them.
Nervous System

These are specialized tissue that responds
to stimuli and carries that response through
the body to relay a message for a certain
response to occur.

Nerve impulse, motor neuron, interneuron,
sensory neuron, axon, collateral branch,
ect..
Reproductive System

Not used in the daily activity of the
insect, but needed for the insect to
reproduce.