About sarahb-2014
View all posts by sarahb-2014:
Poetry in Motion #3
Loading...
Reload document 
Open in new tab Poetry in Motion – Sarah & Rayne
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Acknowledgments
Notice, lock, process
Knots, walk, yield
Face, feel, hug
Exhibit, experience, challenge
Act, exchange, guard
Freeze, excuse, damage
Delight, comfort, dance
Bare, care, match
Silence, waltz, kiss.
Neuron Structure and Function
Neurons are specialized cells in the nervous system. They carry and send messages by emitting electrical signals which move along the neuron’s axon. Dendrites are extensions of neurons that receive signals and then conducts them to the cell body. The neurons use synapses to communicate. An action potential is an electrical pulse that travels down an axon caused by the movement of positive ions in and out of the axon. An action potential is an electrochemical signal from a nerve impulse. After moving down the axon, once the AP gets the amount of stimulation it requires, it moves or triggers a neuron impulse. This step is called the threshold. During an action potential you are at about 30 mV, but at resting potential, you are at -70mV. Resting potential means there are more positive ions then negative ones, outside and inside the axon.
Synapse Structure and Function
A synapse is the connection or junction between two nerve cells where impulses travel through. The location is at the ends of the terminal brnaches of an axon, and the end of the dendrites of the receiving nerve cell. Neurotransmitters are produced by the axon terminal button, and stores them in the vesicles. The synaptic vesicles release the neurotransmitters when the action potential reaches the axon terminal. The neurotranmitters are released into the synaptic gap. They then bind to the receptors of the receiving nerve cell which are either considered as inhibitory, which represses the AP, or excitatory, which stimulates the AP.
How did the discovery of DNA prove that Darwin’s theory of evolution was correct and how does it change the way we view evolution today and into the future?
Darwin’s book on evolution was based on natural selection and how organisms will have a variety of changes in their physical and/or behavioural traits over a period of time due to their environment, and the organisms surrounding it. These changes will help the organism survive in it’s habitat. This goes along with when Darwin was looking at the finches and realized they all had different physical and behavioural characteristics. It helped him to realize that even though they are the same species, they will all have very different and unique DNA, and it all depends on the animal’s role in it’s environment and the things it need to do to survive. Over long periods of time these adaptions will be noticeable and will assist the organism in it’s field. This has helped with and altered the way we view evolution today because human’s realized that all species of animals, reptiles, and even plants, are connected in some very important way. Some examples of this is animals acquiring wings to help them fly, feathers or fur to keep them warm, large beaks for food and defense, and webbed feet for easier transportation through water. Because of Darwin’s theory and discoveries, we have been able to make many more of them and explore so many new ideas with evolution and how it is still in process today.
Eubacteria Kingdom
Yersinia pestis – This example of eubacteria can have a deadly effect on humans and animals causing and spreading “the plague” (Bubonic Plague). The Y. Pestis has three main forms; pneumonic, septicemic, and bubonic plagues.
In the lab “Testing for Acids and Bases”, we used 5 different chemical indicators, (phenolphalein, bromthymol blue, methyl orange, blue litmus paper, and red litmus paper) and we added different solutions to them such as vinegar, aspirin, and ammonia, to see how they would react and change colours. We then had to use the pH Scale and look at the information we gathered to identify the solution as acidic, basic, or neutral.
This lab is very important because you can use this skill all through science in school and in your everyday life. It’s good to know what substances are acidic, basic, or neutral.
I learned that litmus paper can sometimes take a little while to change colour, depending on the solution you added to it. Also, some of the solutions that we used, I wouldn’t expect them to be what they are. For example, I would’ve never thought that oven cleaner is a base and that Alka – Seltzer is a neutral solution.
