Week 3 - Internal Organs of an Insect

Question 1

Is responsible for breaking down foods and just a tube within a surrounding tube called the body. It starts
with a mouth and ends with the anus.

Answer 1

Digestive System

Question 2

Component Parts of Food

Answer 2

Carbohydrates - Monosaccharides
Proteins - Amino Acids
Fats - Glycerol and Three Fatty Acids

Question 3

Largest endocrine tissue

Answer 3

Digestive Tract

Question 4

Ingestion, Storage, grinding and transport of food to midgut. Starts from mouth to proventriculus.

Answer 4

Foregut

Question 5

Biochemical breakdown (digestion via secretion of enzymes) and nutrient absorption

Answer 5

Midgut

Question 5

Absorption of water, salts and other important minerals,
elimination of feces through anus

Answer 5

Hind Gut

Question 6

is a section at the end of the esophagus used to store food for a while.

Answer 6

Crop

Question 7

produce saliva and saliva was stored at reservoirs or salivary
bladder.

Answer 7

Salivary Glands

Question 8

starts at the gastric caeca and ends at the venticulus or mesenteron

Answer 8

Midgut

Question 9

Made up of cuticle that protects the inner surface of the gut wall from abrasion and also serves as a barrier to pathogens that may enter via the digestive tract.

Answer 9

Peritrophic membrane

Question 11

serve to increase the surface area of the midgut, thus increasing both its ability to
secrete digestive enzymes and its ability to extract useful products from the partially digested food

Answer 11

Gastric ceaca

Question 11

Responsible for movement of nutrients, salts, hormones, and
metabolic wastes throughout the insect’s body.

Answer 11

Circulatory System

Question 12

absorption of water, salts and other beneficial substances take place before excretion.

Answer 12

Hind gut

Question 13

It encapsulates and destroys internal parasites or other invaders.

Answer 13

Hymolymphs

Question 14

runs longitudinally through the thorax and abdomen. It collects
hemolymph in the abdomen and conducts it forward to the head.

Answer 14

Dorsal Blood Vessel

Question 15

Responsible for delivering oxygen to all cells of the body and for removing
carbon dioxide (CO2)

Answer 15

Respiratory System

Question 15

At least 8 pairs of functional spiracles

Answer 15

Polyneustic Respiratory System

Question 15

In this case there are no functional spiracles

Answer 15

Apneustic Respiratory System

Question 15

1 or 2 pairs of functional spiracles

Answer 15

Oligoneustic Respiratory System

Question 15

Spiracles 10 pairs with 1 mesothoracic, 1 metathoracic and 8 abdominal. Found in mature insect

Answer 15

Holopneustic

Question 16

Spiracles 9 pairs with 1 mesothoracic and 8 abdominal.
Found in cecidomyid larvae.

Answer 16

Perineustic

Question 17

Spiracles 8 pairs with 1 mesothoracic and 7 abdominal.
Found in mycetophilid larvae.

Answer 17

Hemineustic

Question 18

are the larger tubes of
the tracheal system, running inwards from the spiracles and usually breaking up into finer branches.

Answer 18

Trachea

Question 19

are very fine tubes arise from tracheal cells.

Answer 19

Tracheoles

Question 20

balloon-like structures that may store a reserve of air.

Answer 20

Air-sacs

Question 21

are situated on lateral or posterior sides of abdomen

Answer 21

Gills

Question 22

Large, innervate compound eyes and ocelli

Answer 22

Protocerebrum

Question 22

Found beneath protocerebrum, innervate antennae

Answer 22

Deutocerebrum:

Question 23

Bilobed, innervate labrum and foregut. Main sensory centre controlling insect behaviour

Answer 23

Tritocerebrum