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Hemolymph, or haemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues. It is composed of a fluid plasma in which hemolymph cells called hemocytes are suspended. In addition to hemocytes, the plasma also contains ...
The main function of insect blood, hemolymph, is that of transport and it bathes the insect's body organs. Making up usually less than 25% of an insect's body weight, it transports hormones, nutrients and wastes and has a role in osmoregulation, temperature control, immunity, storage (water, carbohydrates and fats) and skeletal function.
Like other insect species, beetles have hemolymph instead of blood. The open circulatory system of the beetle is driven by a tube-like heart attached to the top inside of the thorax. Different glands specialize for different pheromones produced for finding mates.
In reflex bleeding, insects dispel their blood, hemolymph, or a mixture of exocrine secretions and blood as a defensive maneuver. As previously mentioned, the discharged blood may contain toxins produced within the insect source or externally from plants that the insect consumed.
Danny Camacho's forearms are covered with red welts, in the clustered pattern distinctive to the bite of the Cimex lectularius. Camacho lets bed bugs feast on his blood bimonthly. The 55-year-old ...
The dorsal blood vessel circulates the hemolymph, arthropods' fluid analog of blood, from the rear of the body cavity forward. [64] [65] Hemolymph is composed of plasma in which hemocytes are suspended. Nutrients, hormones, wastes, and other substances are transported throughout the insect body in the hemolymph.
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Coccinellid haemolymph (blood) contains toxic alkaloids, azamacrolides and polyamines, as well as foul-smelling pyrazines. [66] Coccinellids can produce at least 50 types of alkaloids. When disturbed, ladybirds further defend themselves with reflex bleeding , exuding drops from their tibio-femoral (knee) joints, effectively presenting predators ...