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Unit 3 Chapter 11

Assignment

QuestionAnswer
Which of the following describes twitch summation? A second stimulus arrives at the muscle before complete relaxation of the first contraction, causing the second contraction to have greater tension than the first one.
characteristic of skeletal muscle? Overlapping thin and thick filaments Striations Overlapping myosin and actin proteins Excitability Voluntary
Which of the following is/are a functional requirement of cardiac muscle tissue? Cardiac muscle must be independent of conscious control. Cardiac muscles contract in unison. Cardiac muscle fibers must be able to contract without nervous stimulation.
Which of the following is/are true about the functions of cardiac muscle? CM=cardiac muscle Cardiac muscle almost always utilize aerobic respiration to obtain energy. Cardiac muscle secure some of its Ca ions from the sarcoplasmic reticulum. Autorhythmic cells allow myocytes to contract consistently and regularly, efficiently pumping blood
An action potential enters the depths of a muscle fiber by way of _________blank. the T tubules
Which structure do the calcium ions bind to when muscle contraction is initiated? The troponin molecule
Cross-bridges form between the _________blank and the _________blank. actin filaments; myosin heads
An action potential causes calcium ions to diffuse from the _________blank into the _________blank. sarcoplasmic reticulum; sarcoplasm
Which of the following best describes the role of Ca2+ in muscle contraction? It binds to troponin, moving tropomyosin, so that myosin heads can bind to actin.
During contraction of a muscle, calcium ions bind to the _________blank. troponin molecule
The bond between the active site on actin and the myosin head is broken when an _________blank. ATP molecule binds to the myosin head
The bond between the active site on actin and the myosin head is broken when an _________blank. ATP molecule binds to the myosin head
Muscle contractions are initiated by the binding of _________blank to _________blank. calcium ions; troponin
During muscle contractions, cross-bridges form between the _________blank and the _________blank. myosin heads; actin filaments
Which of the following is the site of ATP binding and hydrolysis? Myosin
The _________blank is described as two strands of actin molecules wrapped together. thin filament
Which of the following happens as actin and myosin filaments slide past each other during muscle contraction? Neither actin nor myosin filaments shorten.
Which of the following statements about the "heads" of the myosin molecules is true? They can attach to different sites on the actin filament.
Created by: Gluis5974
 

 



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