PHY2810 Physiology of Human Body Systems Activity of Gastrointestinal Smooth Muscle Worksheet Due by: 2 pm 30th March and 1st April Pre-practical Reading: Vander‚ 12th Edition: Section 6D.4 (pp 175-180)‚ Section 15.2 (pp 521-522)‚ Section 15.4 (pp 528-529‚ 536-538 & 542-543). Name: ________________________________ Student ID: _____________________________ Marks: ________/100______________________ Introduction Give a brief description in your own words of the objectives and aims
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Role of DISC1 and its interactions with Cofilin in pathways leading to Synaptic Plasticity Abstract Cofilin is an actin depolymerization factor responsible for severance of actin filaments in dendritic spines. Cofilin is activated upon de-phosphorylation via slingshot phosphatase (SSH) and deactivated when phosphorylated by LIM-kinase (LIMK). Phosphorylation of Cofilin results in polymerization of F-actin therefore formation of dendritic spines which is associated with LTP. Peptide drugs
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Moorpark College Human Physiology Name: _________________________________ EXERCISE 3 Neurophysiology of Nerve Impulses Laboratory Report Answer the following questions. (3 points each). 1. What is the difference between membrane irritability and membrane conductivity? Membrane irritability is the ability to respond to a stimuli and convert it in to nerve impulses. Membrane conductivity is the ability to transmit that impulse that is created by membrane irritability. 2
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Scleroderma There is a skin disease known as scleroderma that is defined as a chronic connective tissue disorder. Scleroderma is when there is an overproduction of collagen fiber‚ which causes sclerosis (hardening) and fibrosis (scarring) in the skin. Collagen fibers are a type of protein that have great strength and flexibility for certain structures of the body. They are one of the biggest components that make up the connective tissue‚ which is why this disease is known as a connective tissue
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Part I Note: Parts II and III follow below‚ complete all three. Write a 350- to 700-word response to the following: Explain the communication process of neurons in the brain. List some common neurotransmitters and describe their effect on behavior. There are 2 neurons afferent neurons these carry messages to the central nervous system. Efferent neurons carry messages from the central nervous system. Neurons communicate through voltage changes. This can sometimes lead to quick action reaction
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Neurotransmitter Release Lab Report Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. 1. The end of the axon where it contacts a target is called the You correctly answered: c. axon terminal. 2. Neurotransmitter is released into the synaptic gap by You correctly answered: a. exocytosis. 3. Exocytosis of neurotransmitter from the axon terminal is triggered by an increase in the intracellular concentration of You correctly answered: c. Ca2+ . 4. Neurotransmitter
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LABORATORY REPORT (Click on the Save a Copy button on the panel above to save your report) Activity: Name: Instructor: Date: Twitch Contractions and Summation Katrelle Bond Rachel Waite November 7‚ 2014 Predictions Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases contraction force increases. Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases‚ the force of contraction: increases. Materials and Methods Measurement of Threshold
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LABORATORY REPORT Activity 2 Twitch Contractions and Summation Name Instructor Date PREDICTIONS Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases‚ the force of contraction MATERIALS AND METHODS Measurement of Threshold Stimulus 1. Dependent Variable 2. Independent Variable 3. Controlled Variables Effect of Muscle Length on Contraction 1. Dependent Variable 2. Independent Variable
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electrical impulse or signal. The resting potential is around -75 mV. During resting potential‚ the inside of the axon is negative GRADED POTENTIAL ACTION POTENTIAL Action potential is a fleeting reversal of the membrane potential‚ caused by changes in permeability of the plasma membrane of neuron to potassium and sodium ions causing an electrical impulse to be transmitted along the axon. When a stimulus depolarizes the membrane‚ a few of the voltage-gated sodium channels that are found in the
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the cell cannot fire during this refractory period. The action potential travels down the axon as the membrane of the axon depolarizes and repolarizes. Myelin insulates the axon to prevent leakage of the current as it travels down the axon. Nodes of Ranvier are gaps in the myelin along the axons; they contain sodium and potassium ion channels‚ allowing the action potential to travel quickly down the axon by jumping from one node to the next. Action Potential A neuron can receive input from other
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