Circulatory systems of animals
State the various differences between octopuses and mussels with respect to their circulatory systems? How does this difference persuade the mobility of these animals?
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Cephalopod molluscs, such as squids and octopuses, have closed circulatory system having blood pumped under the pressure flowing within the vessels. Bivalve molluscs, such as oysters and mussels, have an open circulatory system also known as lacunar circulatory system, where the blood flows under the low pressure as it falls in the cavities of body and not only circulate within the blood vessels. Molluscs having closed circulatory systems are quite larger, agile and actively move; molluscs having the open circulatory systems are slow, smaller and some are basically sessile.
Phenyl ketonuria is autosomal recessive metabolic genetic disorder characterised by the mutation in the gene of hepatic enzyme phenylalanine hydroxylase,which is an important enzyme to metabolize phenylalanine and tyrosine.Mutation in this gene causes
Besides age composition, there are also changes occurring in gender composition. Women have been entering the workforce in record numbers over last four decades. By 1975 they accounted for approximately 40 percent of the total and at the turn of the century women make up about half the workforce.
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