trend toward bilateral symmetry and cephalization * Invertebrate Nervous Organization * In simple animals‚ such as sponges‚ the most common observable response is closure of the osculum (central opening) * Hydras (cnidarians) have a nerve net that is composed of neurons * Planarians‚ (flatworms) have a ladderlike nervous system * In annelids (earthworm)‚ arthropods (crab)‚ and molluscs (squid) the nervous system shows further advances * Cephalization - concentration
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The Ionic mechanism and propagation of action potentials. The action potential is the result of a large‚ sudden increase in sodium permeability of the membrane. The resulting rush of sodium ions into the membrane and accumulation of positive charge on its inner surface drives the potential towards Ena. This is followed by repolarisation‚ whereby there is a large increase in the membranes permeability to potassium ions‚ hence the membrane returns to Ek. Explanation of the (ionic) mechanisms underlying
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Membrane Behavior Lab Abstract: Introduction: The permeability of a cell to solutes in an aqueous medium depends upon the physical and chemical make–up of the membrane. The maintenance of the living cell depends upon the continued presence and functioning of a selectively permeable membrane. If the nature of the membrane is changed or altered in any way‚ this may well affect its permeability and thus the properties of the cell of which it is a part. Irreversible changes in the permeability
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The Brain and Cranial Nerves Chapter 14 Notes 14.1 Brain Organization‚ Protection‚ and Blood Supply * brain: a portion of the CNS made of neurons and neuroglia * control center for registering sensations and correlating them together and with stored information to make decisions and take action * center for intellect‚ emotions‚ behavior and memory * neural tube: brain and spinal cord develop from the ectodermal tube * anterior part expands * inner
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Cell Membrane The Cell Membrane- The cell membrane is a semi-permeable membrane that surrounds the cytoplasm of a cell; the cell membrane is made up of phospholipids‚ proteins and carbohydrates. Its function is to protect the integrity of the interior of the cell allowing certain substances into the cell‚ while keeping other substances out. The phospholipids form a thin‚ flexible sheet while the proteins float in the phospholipid sheet like an ice berg‚ and the carbohydrates extend out from the
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Abstract Pyromania is an impulse control disorder categorized by the DSM-5 as “deliberate and purposeful fire-setting on more than one occasion” combined with “tension or affective arousal”‚ “pleasure‚ gratification or relief when setting fires or when witnessing or participating in their aftermath” (American Psychiatric Association‚ 2013). Also‚ those diagnosed with pyromania aren’t setting fires for monetary gain‚ to conceal crimes‚ as an expression of emotion or ideology‚ or because of impaired
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anything covered in lecture may appear on the exam. Membrane Transport 1. Describe the cell permeability and membrane transport. What can enter/exit the cell on its own? What requires assistance? Why? 2. Describe membrane potential. What is it? How is it established? How does it influence the transport of charged molecules? What are the components of the electrochemical gradient? 3. What are the different types of membrane transport? Describe each in detail. Which move solutes
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Classification of Body Membranes Laszlo Vass‚ Ed.D. Version 42-0010-00-01 Lab repOrt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent
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The readership that Ellen Hopkins targets in her novel Impulse would be teenagers and up‚ since the story follows three teens (who are nearly eighteen years old). I think within that‚ she targets readers who maybe can relate. Impulse deals with a lot of heavy topics‚ most notably suicide‚ and I think Hopkins targets a readership that can relate to what these teens are going through. The readership could even be those who have similar issues in their lives. Her target readership could also be people
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sciatic nerve‚ speed of transmission and degree of myelination can all have an effect on the sciatic nerve and therefore the peak contractile force of B. Marinus. The diameter of the axon in the sciatic nerve would impact how fast the action potential is conceived down the axon to the synaptic cleft and muscle (Firmin‚ L. 2014). If one of the toads had a smaller axon diameter it would allow for resistance to movement to occur due to friction. The diameter of the axon in the sciatic nerve would therefore
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