i would say it means how would organisms would react in an ecosystem. think of everyday life in your backyard perhaps. the grass uses the energy from the sun to grow. another organism, lets say a horse, eats the grass as a main source of food. lets say another grass eater lives there too-like a cow. the cow and the horse would naturally compete as they both rely on the same food source, and the same living space that is close to that food source, and so on as you move up in the food chain.
Myelin can greatly increase the speed of electrical impulses in neurons because it insulates the axon and assembles voltage-gated sodium channel clusters at discrete nodes along its length.so the signal speed might slow down as it got halved
Myelin is the insulating layer, or sheath that forms around the nerves, including those in the brain and in the spinal cord. It is made up of some protein and fatty substances. This myelin sheath is allows electrical impulses to the transmit quickly and efficiently along with the nerve cells. If the myelin is damaged, these impulses slow down.
Myelin is repaired or replaced by the special cells in the brain called as oligodendrocytes. These cells are made from special type of stem cell that found in the brain, called as oligodendrocyte precursor cells (OPCs).
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Answer:
→presence of lot of mucus which blocked the respiratory pathways.
→narrowing of air ways due to inflammation of the epithelial limning.
→inability of the alveolar walls to expel air due to loss of elasticity
Explanation:
When an individual experiences difficulty with breathing,coughed with thick sputum produced,and accompanied with wheezing sounds, there is likelihood of the blockage or obstruction of the respiratory passages to the lungs, which traps air in the lungs and prevents its removal.This condition is called COPD. It is the combination of some pulmonary disease mostly-emphysema and chronic bronchitis, and worsen with time.
Emphysema is the loss of elasticity of the alveolar due to damage to the Elastin tissues(usually by nicotine, tar, in cigarette) which allows the sacs to expand and contracts.Sacs are filled air , but the trapped air can not escape , therefore the lung expands,creating pain for the subject.
The chronic bronchitis is the inflammation of the epithelial lining, which continue to irritate the bronchi, which stimulate immune response and therefore mucus production. it is this mucus that blocked the bronchi given difficulties with breathing (shortness of breath)giving wheezing sounds.
<u>Good lifestyle,intake of medication are measures to cure and prevent this.</u>
