A graded potential in physiology‚ is described as local changes in membrane potential that occur in varying grades or degrees of magnitude or strength. When compared to graded potential‚ an action potential is described as brief‚ rapid‚ large (100mV) changes in membrane potential during which the potential actually reverses so that the inside of the excitable cell transiently becomes more positive than the outside. As with a graded potential‚ an action potential involves only a small portion of
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Question 1 Question text Neurons _____. Select one: a. transmit neural impulses. b. support and nourish glial cells. c. each have only one dendrite. d. are one kind of neurotransmitter. Question 2 Question text A synapse is the _____. Select one: a. same as the action potential. b. junction where neurons communicate with one another. c. chemical that travels from one neuron to another. d. signal that travels from one neuron to another. Question 3 Question text
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Activity 1 Pre-Lab Quiz K+ inside a cell = 150 mM; K+ outside a cell = 5 mM Na+ inside a cell = 5 mM; Na+ outside a cell = 150 mM Stop & Think question What is the polarity of the resting membrane potential (voltage)? Negative What does it mean that the voltage just inside the membrane is negative? B Membrane of most cells contains K+ leak channels…..b What will happen to the resting membrane potential if the extracellular K+ concentration is increase? Less negative What happens
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Page 429 #’s 1-7 1. List the three major parts of the brain and describe their locations. A. cerebrum- constitutes about 83% of its volume and consists of a pair of half-globes called the cerebral hemispheres. B. cerebellum- lies inferior to the cerebrum and occupies the posterior cranial fossa. C. brainstem- that which remains of the brain if the cerebrum and cerebellum are removed. 2. Gyrus- a wrinkle or fold in the cortex of the cerebrum or cerebellum. Sulcus- a groove in the surface of
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myelin sheath Axon Terminals – the ending fibers of the axon. Terminal Knobs (or buttons or bulbs) – things at the end of each axon terminal which release the neurotransmitters across the synaptic gap (or cleft) upon firing Receptor Sites – crevices located along the dendrites which are designed to receive specific neurotransmitters or ones which resemble them Types of neurons: White Matter – refers to masses of myelinated axon Grey Matter – refers to masses of unmyelinated axon Sensory (or
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Biology of Mind Modules 4‚ 5 and 6 * Everything psychological is simultaneously biological * Plato correctly located the mind in the spherical head * Aristotle believed mind was in the heart * Although heart is the symbol for love‚ psychology has proven that you fall in love using your brain * 1800s Franz Gall (German psychologist) invented phrenology theory that claims that bumps on our skull could reveal our mental ability and character traits * Biological
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A contraction in which the muscle does not shorten but its tension increases is called isometric. 12) T 13) Muscle contraction will always promote movement of body parts regardless of how they are attached. 13) F 14) The effect of the neurotransmitter on the muscle cell membrane is to modify its permeability properties temporarily. 14) T MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 15) Calcium ions bind to the ________ molecule
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Ecstasy or MDMA (3.4 MethyleneDioxyMethAmphetamine) is a stimulant type of drug‚ that comes in a tablet that is often branded. This drug also comes in powder‚ gel capsule‚ or liquid form. Ecstasy has a short history and is first found being used medically‚ until being using an illegal drug. Originally‚ it was developed by Merck pharmaceutical company in 1912‚ and was named MDMA. In 1953‚ Ecstasy is used as psychological warfare tests by the US Army‚ and then revise as a psychotherapy medication to
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that present time [ (Myers‚ 2009) ]. This is done on a subconscious level (even though there is no true subconscious‚ we can use this‚ as it is a common understanding of underlying and genetically programmed thought processes). As chemicals/neurotransmitters pass the blood-brain barrier‚ they change the balance of our brains and invoke emotions‚ such as those given with the ‘fight or flight’ reflex or in our social awareness‚ relative to embarrassment‚ and the reaction factors associated with how
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Its primary role is to connect the central nervous system to the limbs‚ organs‚ and skin to allow for movement of the body. It is made up of different kinds of neurons‚ which communicate with each other through electric signaling and neurotransmitters. There are two categories within the peripheral nervous system‚ known as the autonomic nervous system and the somatic nervous system. The autonomic nervous system is the part of the nervous system that regulates the involuntary activity of the
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