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.
Define the Absorption of Amino Acid Proteins are absorbed in the form of amino acids. Amino acid transport occurs 'only in the presence of simultaneous sodium transport. Carrie
the characteristics of the core
Can you please explain gas exchange to me
Making soil from rocks Search some soft rocks in your locality like as shale or weathered limestone. Bring them into the classroom and have the peoples crush and grind them up
Define the parietal area of the Cerebrum The parietal area, as you can see in the Figure, lies behind the post central area and includes greater part of parietal lobes of the c
Describe the structure of the stomach. How is it modified to carry out its functions? How does It compare to that of the fetal pig?
Occurrence and characteristics of earthquakes
To show that expired air contains carbon dioxide The two flasks are linked so that when you breathe by the T piece, all the air bubbles by the lime water in the flasks. One tub
In what layer of the Earths atmosphere does most of our weather occur? Troposphere
I can''t identify which tree this is
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