Write a short note on open type of circulatory system
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Answer:
Open circulatory systems are systems where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract. Open circulatory systems use hemolymph instead of blood
Answer:
Open circulatory systems are systems where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract.
Open circulatory systems use hemolymph instead of blood. This “hemolymph” performs the functions of blood, lymph, and intestinal fluid – which are three different, highly specialized fluids in animals with closed circulatory systems.
Instead of a complex and closed system of veins and arteries, organisms with open circulatory systems have a “hemocoel.” This is a central body cavity found inside most invertebrate animals where both digestive and circulatory functions are performed. This hemocoel may have “arteries” through which the blood can reach tissues – but these arteries are not closed and do not circulate blood as quickly as closed, muscle-assisted arteries.
Open Circulatroy
Within the hemocoel, hemolymph directly absorbs nutrients from food and oxygen from the lungs or breathing pores. It also contains immune cells – but hemolymph does not have red blood cells like our own. Instead of using hemoglobin to carry oxygen, organisms with open circulatory systems use blue or yellow-green pigments to carry oxygen throughout the body.
Many animals that use open circulatory systems do have a heart – but the heart only pumps hemolymph to different cavities in the hemocoel. From these branches of the central body cavity, blood and the oxygen and nutrients it contains must penetrate the tissues and then return to the heart without the help of highly specialized pathways or muscle-assisted arteries like vertebrates possess.
Open circulatory systems are used by arthropods and most mollusks. This is one or several reasons why there are no giant insects; open circulatory systems are less efficient than closed circulatory systems, and cannot move oxygen efficiently enough to power large bodies.
Interestingly, while octopi and squid are considered mollusks, they have evolved closed circulatory systems. This is why they are able to reach huge sizes – colossal squid are thought to reach almost 50 feet in length, and weigh up to 1,650 pounds!
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