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!
How does our body know 'what to do'
Feeling, knowing, doing anything depends on special structures called nerves. Neuronal cells in the body act as various messengers according to the need involved. We are born with all the nerve cells we will ever have. There are about 100-billion nerve cells in our brain. If any nerve cell is somehow damaged, it will not be replaced by a new cell. Each nerve cell is known as a neuron. We will learn about the morphology of the nerve cell in the next section. The nervous system, as you may recall reading earlier, consists of 100-billion neurons and the glial cells. The whole brain is a collection of neuronal and glial cells. These cells are also responsible for higher functions of the brain like learning, memory, speech etc. This fascinating study of biological function of nervous system is called as neurobiology.
So how does our body get to know, what to do? The terminal endings of the nerves are equipped with sensitive receptors. They generate the impulse in relation to any change in the environment i.e., temperature, pressure, touch and send them to main part of the nerve cell, to be transmitted to the brain. The brain receives such messages from various axonal tips. Further brain decides what information has to be processed. If actions are necessary, brain signals the muscles to carry out the work required. We will learn about this mechanism in greater details later here in this unit. A neuron releases its messages as chemicals. These are capable of changing polarity of cells. This is because of the ionic nature of the chemicals. Since it is achieved through movement of ions, we call them ionic channels. Their movement is termed as gait. The ions which play a major role are Ca++, Na++, K+. They are able to create energy for nerve cells to function in a better manner. This creates some amount of electricity in the cell, which can be measured in volts. This principle was discovered by an Italian scientist Alessandre Volta during his experiment on frog leg muscle. We will understand the functioning of the nerve cell better by first getting to know the morphology of the nerve cell.
What is the rock cycle explain breifly? The rock cycle is the full "life" of a rock from its original formation to its demise through weathering, and rebirth through recrystall
Explain the Hyposecretion or Hypothyroidism in Adult Life Decreased secretion of thyroid hormone results in the development of myxoedema. There is a slowing of mental and physi
compare and contrast the hydra to one of the protozoan observed in class
Management of Water Resources Management: Management of Water Resources Management of water resources means a programme to provide an adequate supply of good quality of water
Gases : Critical temperature is the A substance which has a critical temperature below 50°C, has a vapour temperature above which pressure of more than 3 bars absolute (highly
Factors decide the broad area of scientific activity
what is biological sickness of soil and give mangement measures?
Classification of Fires As explained also. We can say that the four main sources of fire risk in the science laboratory are: i) flammable substances, ii) compressed and
Amino acids are the building blocks of proteins. All proteins consist of a sequence of amino acids, which are compounds containing an amino group (-BIB) and a carhoxyl gro
Personal Protective Devices : We shall now discuss the details of protective devices required for safety in a laboratory. The aim of protective devices is to minimise the risk of
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