summary on insect circulatory system
DESCRIPTION
Summary on circulatory system of most insectsTRANSCRIPT
The Insect Circulatory System
0 Insects have an open circulatory system.
0 The hemocoel is filled with hemolymph that bathes the organs
0 Insects have local pulsatile organs at the bases of appendages that pump hemolymph
0 It does not carry oxygen along its circulation.
Insect Circulatory Organs
DORSAL VESSEL
0 principal organ responsible for blood circulation
0 lies along the dorsal midline of the insect body
HEMOCOEL
0 the compartmentalized structure of this cavity is due to the presence of one or two fibromuscular septa
Insect Circulatory Organs
HEART
0 usually closed at its posterior end and bears a number of valvular openings (ostia)
ALARY MUSCLES
0 fibromuscular innervated structures attached laterally to the body wall and vary in number from 1-13 pairs
Insect Circulatory Organs
HEMOLYMPH
0 Colorless liquid that bathes the insect tissues
0 Only about 10% are hemocytes and the rest of the hemolymph content is watery plasma
0 Known functions:
- phagocytosis
- coagulation
- encapsulation of foreign objects
- wound healing
Insect Circulatory Organs
HEMOLYMPH COMPOSITION:
0 90% Water
0 Inorganic ions
0 Nitrogenous wastes
0 Carbohydrates
0 Lipids
0 Proteins and enzymes
0 Pigments
0 Hormones
Insect Circulatory Organs
HEMOLYMPH FUNCTIONS:
0 Lubricant for tissues and internal organs
0 Hydraulic medium (caterpillars, wing expansion, etc.)
0 Transport medium for nutrients, wastes and hormones
0 Storage (amino acids, water, and glycerol)
0 Heat exchange
0 Immune response
Circulation
0 When the heart contracts, the valves of the ostia are closed by the pressure and the hemolymph is moved forward and dumped into the head area.
0 Alary muscles aid the contractions of the heart.
Circulation
0 The blood circulation is also aided by the presence of the dorsal and ventral diaphragms, which consists of sets of muscles that divide the hemocoel into various sinuses.
The Insect Circulatory System
Overview
VERTEBRATES
INSECTS
0 Closed circulatory system
0 Blood
0 Heart
0 Oxygen Transportation
0 Open circulatory system
0 Hemolymph
0 Dorsal Vessel
0 Transport of other substances
References
http://home.sandiego.edu/~gmorse/2010BIOL348/Biol348_Website/Lectures/2010_02_15_lecture_4.pdf
http://www.faculty.ucr.edu/~insects/pages/teachingresources/stoffolano/2.pdf
http://insects.about.com/od/morphology/ss/internalanatomy_4.htm