Using your hands and forearms to push against--but not move--a brick wall involves which of the following?
A) isotonic contraction
B) concentric contraction
C) isometric contraction
D) eccentric contraction
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Question 2) Lifting a 25-lb barbell by flexing your forearm requires ________.
A) the biceps brachii to contract concentrically and the triceps brachii to contract eccentrically
B) eccentric contraction of both the biceps brachii and triceps brachii
C) the biceps brachii to contract eccentrically and the triceps brachii to contract concentrically
D) Isometric contraction of the biceps brachii and concentric contraction of the triceps brachii
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Question 3) Of the activities listed below, which relies primarily on isometric contractions?
A) answering the telephone
B) bending down to pick up a textbook
C) throwing a ball
D) sitting in an upright position
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Question 4) The range of motion at a joint is called ________.
A) static flexibility
B) flexibility
C) muscle fatigue
D) dynamic flexibility
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Question 5) The activation of increasing numbers of motor units is known as ________.
A) motor unit recruitment
B) muscle fatigue
C) muscle tension
D) threshold stimulus
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Question 6) After a period of intense exercise, the build-up of lactic acid leads to ________.
A) oxygen debt
B) glycolysis
C) the Cori cycle
D) muscle fatigue
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Question 7) How do dynamic and static flexibility differ?
A) Dynamic flexibility considers resistance to a motion as well as the difficulty of a movement.
B) Dynamic flexibility only measures range of motion.
C) Static flexibility considers resistance to a motion as well as the difficulty of a movement.
D) There is no difference between the two.
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Question 8) Static flexibility is measured with a ________.
A) yard stick
B) protractor
C) ruler
D) goniometer
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Question 9) Production and accumulation of ________ in muscle cells leads to muscle fatigue.
A) lactic acid
B) ATP
C) glucose
D) glycogen
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Question 10) A motor neuron and all the muscle fibers it controls is called a ________.
A) neuromuscular junction
B) threshold stimulus
C) motor nerve
D) motor unit
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