1. INSECT CIRCULATORY SYSTEM
DORSAL VESSELS(SALUR DARAH)
HEMOCOEL
HEMOLYMPH
OPEN CIRCULATORY SYSTEM
The organ sits in open cavity (haemocoel) filled with insect blood called ‘HAEMOLYMPH’
No arteries, veins or capillaries

2. The function of circulatory system
Transport nutrients to various cells, tissues and organs
To carry waste products to the excretory system (malphigian tubules)
Provide immunity to harmful organism that enters insect body
DOEST NOT TRANSPORT OXYGEN

3. HEMOLYMPH Consists of: 1) 90% PLASMA:
a watery fluid: usually clear, sometimes greenish or yellowish
high concentrations of amino acids, proteins, sugars, and inorganic ions.  
1) 10% HEMOCYTES:
various cell types
involved in the clotting reaction, phagocytosis, and/or encapsulation of foreign bodies.  
does NOT contain hemoglobin (or red blood cells).  
Oxygen is delivered by the tracheal system, not the circulatory system.

4. MECHANISM OF HEMOLYMPH FLOWS

5. DORSAL VESSELS (SALUR DARAH)
HEART
divided segmentally into chambers
that are separated by valves (ostia) to ensure one-way flow of hemolymph.  
A pair of alary muscles are attached laterally to the walls of each chamber.  
Peristalsis: these muscles force the hemolymph forward from chamber to chamber
AORTA
In front of the heart,
lacks valves or muscle.  
continues forward to the head and empties near the brain.  
Hemolymph bathes the organs and muscles of the head as it emerges from the aorta
then back over the alimentary canal,through the body until it reaches the abdomen and re-enters the heart.

6. CIRCULATORY PATH HAEMOLYMPH FROM BODYENTER OSTIA
( HEART MUSCLE RELAX)
PERISTALSIS
BATHES HEAD
AND ALL ORGANS
& BACK TO
ABDOMEN
AORTA
(LACK MUSCLES & VALVE)
MOVE FORWARD
CHAMBERS
(MUSCLE COTRACT)

7. REMEMBER!!!! DOES NOT CARRY OXYGEN!!!
So blood flow is not critical like us human

8. INSECT CIRCULATORY SYSTEM
CLICK THE YELLOW BOX
The roles
hemolymph
Open circulatory system
hemocoel
Dorsal vessel
aorta
Heart
ostia