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Using examples of invertebrate nervous systems how can the process of evolutionary cephalization be described?
Considering the instance of invertebrates it is observed that evolution makes the enhancing of the complexity of the organisms to be accompanied by convergence of nervous cells to special structures for controlling and commanding: the ganglia and the brain. In easy invertebrates, like cnidarians, the nervous cells are not concentrated but they are found dispersed in the body. In platyhelminthes a starting of cephalization with the anterior ganglion concentrating neurons is already verified. In annelids and arthropods the existence of a cerebral ganglion is evident. In cephalopod molluscs the cephalization is even big and the brain commands the nervous system.
Blood from the fetus circulates through the placenta. a) What substances pass (i) from the maternal to the fetal blood, (ii) from the fetal to the maternal blood?
EMERGENC E OF CONTEMPORARY BIOLOGY - 1 . Aristotle (384-322BC) - Greek Classified animal species and arranged them in hierarchies. Formulated 'Great chain of
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How to increase in the amount of glucokinase in liver Consumption of a meal rich in carbohydrate or administration of insulin initiate an increase in the amount of glucokin
A diploid cell contains four pairs of homologous chromosomes designated C1 and C2, M1 and M2, S1 and S2, and W1 and W2. Predict the number of different haploid cells that could be
Question 1 A patient is admitted to the hospital with suspected pneumococcal pneumonia. How would you confirm this initial diagnosis? Answer the following questions a) Which is
Define Surgery Process for Head and Neck Tumor? Treatment mostly involves combination of surgery and radiation. Chemotherapy is also used in some cases, we will learn about the
fish liver oil is rich in which vitamin ???
Q. Direct use values of biodiversity? Direct use values are for those goods that are ensured directly e.g. food and timber. Maintaining a wide range of components of biological
Sex Determination - Reproduction Sex, whether an individual will be a male or a female is determined at fertilisation, and this directs and controls all the later processes i
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