
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Which type of contraction develops more muscle tension: isotonic or isometric?
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- Indicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.arrow_forwardWhy does repeated stimulation of the muscle (at maximum stimulus) before it has completely recovered from the previous contraction lead to increasing force of contractions?arrow_forwardWhat are the structural and functional differences between slow and fast muscle?arrow_forward
- what are the events of muscle contraction at the microscopic and macroscopic level.arrow_forwardWhat type of muscle contraction occurs when cross bridge cycling is occurring but the whole muscle is not changing length?arrow_forwardWhat is the importance of acetylcholinesterase in muscle cell contraction?arrow_forward
- The three key ions in muscular contractions are .... A) sodium, calcium, chloride B) calcium, sodium, phosphate C) calcium, chloride, potassium D) sodium, potassium, calciumarrow_forwardWhat is a significance of the sliding filament mechanism? What is a function of contractile proteins of skeletal muscle sarcomere?arrow_forwardWhat is the steps in the Sliding Filament theory of muscle cell contraction in correct order? Including steps in depolarization and repolarization.arrow_forward
- Which of the following causes ( the state of ) rigor in skeletal muscle ?a) lack of atp b) decrease of intracellular ca2plus c) increase in intracellular ca2+ d) lack of action potential in motor neuronsarrow_forwardDescribe the 2 main types of muscular contractions. Give 3 examples for each type of concentric contractionarrow_forward
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