important definitions. γ-Aminobutyric acid‚ also known as GABA is the chief inhibitory neurotransmitter in the mammalian central nervous system. It plays the principal role in reducing neuronal excitability throughout the nervous system. GABA-A receptors are one form of GABA receptors
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BIOLOGY Are eyes enough to enjoy this natural splendour ...? Didn’t you notice the picture drawn by Raju and its caption? What is your opinion about the caption? You too might have got the opportunity to enjoy such scenes from nature. What have your blissful experiences in such situations been? — — — — — Colourful scenes The chirping of birds The gentle pat of the breeze The intoxicating fragrance of flowers The honey-sweetness of mango 7 BIOLOGY Though these are different experiences
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endoderm layers and can put more complex and complicated organ systems in the space. Nematoda rigid cuticle works with the muscles and acts as hydrostatic skeleton and circulatory system as nematodes lack circumferential muscles. While the Circulation of flatworm has a gastrovascular cavity with one opening. It eats small worms‚ insects and microscopic matter. Digestion A flatworm has a simple form and combination digestive and excretory system. It takes food in and gets rid of wastes from the single
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Test 01 - Introduction Receptor cells use chemical transmitters to communicate with relay cells or afferent nerve fibers. In all sensory systems‚ accessory structures modify‚ in some way‚ the stimulus going to the receptor surface. Receptors are electrically polarized cells and therefore have a resting membrane potential. Stimuli produce‚ in the appropriate receptors‚ a change in the electrical properties that is known as the receptor or generator potential. The two ways in which sensory stimuli
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with a sensory experience. This begins when the sensory receptors receive energy from a particular stimulus‚ which trigger receptor cells. The physical energy is converted into electrochemicals‚ then passes along sensory nerves‚ to the central nervous system where the brain receives the energy as a detailed message. However‚ not all physical energy produces a sensation. A minimum intensity‚ termed absolute threshold‚ must be achieved in order to produce a sensation. Perception takes place when the
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A bipolar cell is a type of neuron which has two extensions. Bipolar cells are specialized sensory neurons for the transmission of special senses. As such‚ they are part of the sensory pathways for smell‚ sight‚ taste‚ hearing and vestibular functions They are found in the vestibulocochlear nerve‚ but reference to bipolar neurons is usually to cells in the retina. A unipolar cell is a type of neuron in which only one protoplasmic process (neurite) extends from the cell body. Most neurons are multipolar
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tasted good it was all right for her. Her lack of anxiety (worry) about the diet kept her fit. For a good digestion you need to be perfectly relaxed in what we are eating. Only then‚ the parasympathetic nervous system will help us in good digestion. We should never worry about our diet system when we start to eat. On the other hand if we eat in fear and tension body refuses to co-operate and would suffer from cancer
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DEFINE | ANSWER | psychology | scientific investigation of physical and mental behavior | experimental method | used to text predictions derived from theory | basic science | accumulation of knowledge for knowledge sake (describe‚ predict‚ and explain behavior) | applied science | application of knowledge to solve practical problems (modify behaviour). | Empiricism | knowledge based on observation | Scientific Method | rules for observation‚ experimentation‚ and measurement | Skepticism
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Per the Center for Disease Control and Prevention (CDC)‚ “Benzene works by causing cells not to work correctly. For example‚ it can cause bone marrow not to produce enough red blood cells‚ which can lead to anemia. Also‚ it can damage the immune system by changing blood levels of antibodies and causing the loss of white blood cells.” (CDC‚ 2013) The extend of benzene poisoning depends on length of exposure‚ preexisting medical conditions‚ route‚ and amount. At the Love Canal‚ there was over 6‚900
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Links to pages in the CGP Revision Guide and weblinks Biology Unit B1 - Topic 1 Classification‚ variation and inheritance 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Links Demonstrate an understanding of how biologists classify organisms according to how closely they are related to one another including: a Species – groups of organisms that have many features in common b Genus – contains several species with similar characteristics c Family – comprising of several genera
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