current into cells‚ decrease calcium efflux from cells‚ increase cellular permeability to calcium‚ or decrease sarcoplasmic reticulum reuptake of intracellular released calcium. Intracellular accumulation of calcium causes the activation of actin-myosin contractile proteins‚ which enhanced vascular tone and total peripheral
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Lab 4 – The Cell Answer Key Procedure 4.3 Draw a picture of a single Elodea cell and label all visible structures. See the diagram in your lab manual. Without staining‚ the only structures that should have been clearly visible should have been the cell walls and the green chloroplasts. Is this cell prokaryotic or eukaryotic? ______Eukaryotic_______________________ What evidence do you have to support this claim? The presence of organelles (chloroplasts) and its large size.
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Muscle contractions tend to be smooth and vary in strengths‚ depending on the demands placed on them. The variations of strength are called graded muscle responses. There are two ways a muscle contraction can be graded‚ either by changing the frequency of stimulation or by changing the strength of the stimulation. When a muscle is responding to a change in stimulus frequency‚ the nervous system will reach a greater muscular force when increasing the firing of motor neurons. This causes a wave or
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myofilament ARRANGMENT OF MYOFILAMENTS A Bands Dark areas‚ w/ thick filaments I Bands Light area‚ w/ thin filaments Z Line Within the I band H Zone Light‚ Middle of each A band M Line Within H zone‚ inside A band Sarcomere Between 2 Z lines PARTS MYOSIN ACTIN THICK THIN Tail Troponin (displaces tropomyosin) Heads Actin Flexible Hinge Region Tropomyosin (covers head) MOTOR UNIT - single alpha motor neuron + muscle fibers that it innervate - FINE: alpha motor neuron innervates FEW muscle fibers; GROSS:
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can go no farther. The contraction is therefore a weak one. On the other hand‚ if a muscle fiber is too stretched before it is stimulated‚ there is relatively little overlap between its thick and thin filaments. When the muscle is stimulated‚ the myosin heads cannot “get a good grip” on the thin filaments‚ and again the contraction is
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Nanoscience vs. Nanotechnology Introduction Student Guide Lesson Overview In this lesson‚ you will learn the differences between “Nanoscience” and “Nanotechnology.” Both are extremely exciting‚ but have distinct differences in what the people in these fields do. Throughout this lesson you’ll be asked to research and discuss what is happening in nanoscience and nanotechnology. A lot is going on in both fields and the potential for a lot more is HUGE. Before coming to class Complete the on-line
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Anatomy & Physiology I Lecture 10: The Muscular System Prof. Magidah Alaudi‚ M.Sc. malaudi@gmail.com The Structural and Functional Organization of Muscles • About 600 human skeletal muscles • Constitute about half of our body weight • Three kinds of muscle tissue – Skeletal‚ cardiac‚ smooth • Specialized for one major purpose – Converting the chemical energy in ATP into the mechanical energy of motion; Contraction and Movement • Myology—the study of the muscular system The Functions of Muscles
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I enjoy my science classes because they satisfy my curious side. I do not just want to know that the deltoid is the muscle found in the upper arm‚ I want to know it works because the myosin and actin fibers contract when nerve impulses are sent from the brain. This curiosity is what I believe will help me complete the proper schooling needed to become a research scientist. In the meantime‚ I can help raise money for the Crohn’s and Colitis
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Nitrogen in the air enters and leaves living systems by way of the nitrogen cycle. Describe the events which take place when atmospheric nitrogen molecules move along a food chain (involving legumes and herbivorous mammals) and eventually return to the atmosphere. In your answer‚ describe the uptake‚ processing and utilization of nitrogen in the bodies of these organisms Atmospheric nitrogen in air enters by diffusion or gaseous exchange and leaves the bodies of most organisms without biotransformation
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Introduction to Myasthenia Gravis Myasthenia Gravis‚ also Known as "grave muscle weakness" is a chronic muscle disease that causes abnormally rapid fatigue of the skeletal muscle system‚ which are the voluntary muscles. The affected muscles tire quickly but regain strength after a period of rest. Myasthenia Gravis is termed an autoimmune disease. The immune system usually makes antibodies to attack bacteria‚ viruses and germs. With the autoimmune disease‚ the immune system makes antibodies
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