Musculoskeletal Physiology

Welcome to your Musculoskeletal Physiology Quiz. This quiz has 60 multiple choice questions. Make sure to mark an answer for every question! Good luck!
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In a muscle that is contracting:
- Ca2+ is bound to troponin
- Ca2+ is bound to tropomyosin
- Tropomyosin covers the binding sites on actin
- Troponin covers the binding sites on myosin
From an isotonic twitch, the following features are known: the latent period lasts 20 msec the contraction time (crescente) lasts 10 msec the relaxation time (decrescente) lasts 10 msec What does the time between following action potentials need to be in order to change this twitch into an unfused tetanus?
- between 0 and 20 milliseconds
- between 20 and 30 milliseconds
- between 25 and 35 milliseconds
- between 30 and 40 milliseconds
Which of the following events that take place during a muscle contraction, need ATP?
- coupling of actin and myosin filaments
- uncoupling of actin and myosin filament
- alternative a. and b. are both correct
- alternative a) and b) are both incorrect
Which of the following is a feature of a small motor unit (as compared to a large motor unit)? Small motor units:
- have very few motor neurons that innervate them
- have very few muscle fibers in their motor unit
- are found in muscles with coarse movements
- secrete a few packets of acetylcholine in their neuromuscular synapses
Which of the following factors increases the total force in a muscle?
- a decrease in the recruitment of motor units
- an increase in the speed of contraction
- a decrease in the number of fast glycolytic fibers that are used
- an increase in the action potential frequency