Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Information Processing in Sensory Neuron
You have previously seen that the sensory neuron transmits the information it receives, as an action potential along its axon. We describe them an impulse. The intensity of the stimulus is transmitted along the nerve fibre through changing frequency. A stimulus of greater intensity will result in greater frequency of firing along the axon, one of lower intensity will comprise lower frequency. Let us see what happens when one of the first pair of legs of a cockroach is touched. Stimulation of the mechanoreceptors of the first leg of a cockroach by touch will be perform by the axon to neurons in the first thoracic ganglion where it makes connection, in simplest case, through synapse, along with a motor neuron directly. In more complicated cases, the motor neuron may be informed by one or more association neurons. These neurons may be receiving at similar time a number of other stimuli from a large number of presynaptic fibres. Some of them might be excitatory and some of them may be inhibitory, So carrying opposing instructions.
This type of connection also enables higher centers of the central nervous system to exert control over the action, so that, if unsuitable, it can withhold from exercising the reflex, like running away. Thus the postsynaptic cell receiving frequently contradictory messages, decides whether to fire or not, on the basis of all the instructions it receives. In case the neuron 'decides' to fire, the stimulus can result in the release of neurotransmitter at its terminals making the concerned muscle to contract, causing movement of the leg and the animal run away. This type of receptor-effector loop is the lowest level of information processing via central nervous system and is called a reflex. In lower animals this constitutes their whole behavior. However, in higher animals particularly in those like cephalopods and insects, with a well developed central nervous system, varying degrees of higher levels of control are exerted on the reflexes along with increasing hierarchy of the central nervous system exerting its influence. These animals comprise larger and complex type of brains by invertebrate standards; their large eyes and other sense organs feed a range of stimuli into the brain. There are various motor centres in the central nervous system finally controlling activities through various motor centres. We must not forget that most animals have as well the capacity of learning. Learning provides the animal with a record of information on which it can draw and act. The memory gives this information and the central nervous system can select the motor activity best suited for the animal's life.
Endocrine Regulation of the Cycle - Reproduction You have learnt above that the reproductive cycles are governed by the interplay of pituitary and gonadal hormones. According
What were coopers views on nature (particularly in regard to human progress and resource use)? And Is there any thought about rights of nature or conservation of resources in her w
What is the function of the iris and of the pupil? The iris works like the diaphragm of a photographic camera as it has muscles that contract or relax varying the pupil diamete
What is the basic structure of the HIV virus? What is the function of the glycoproteins of its envelope? HIV is an RNA virus. In its core there are two strands of RNA and reve
Autochory - Dispersal of Seeds This mechanism of self-dispersal is based on forceful expulsion of the seed from the fruit because of desiccation or turgidity of the cells of
How does the universality of the genetic code make the recombinant DNA technology possible? The universality of the genetic code refers to the fact that all living beings have
What are the main interspecific ecological interactions? The major harmonious interspecific ecological interactions are: protocooperation, mutualism and commensalism. The major
Genetics of Nitrogen-fixation The genetics of nitrogen-fixation is known in detail in Klebsiella pneumoniae. There are twenty genes required in organising the complete N 2 -fi
Describe the process of biosynthetic phase of photosynthesis occurring in the chloroplast. Explain the process of development of root nodules in a leguminous plant. Name the ox
Classification of Enzymes It has been a long tradition of giving enzymes names ending in 'ase'. The only major exception to this 'ase' is the proteolytic enzymes, whose names
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd