The contraction phase of a muscle twitch has a shorter duration than the relaxation phase.
Answer the following statement true (T) or false (F)
True
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Atoms or molecules which carry a charge are called ________
A) Ions B) Elements C) Protons D) Neutrons
Fast fibers
A) have low resistance to fatigue. B) rely on aerobic metabolism. C) have many mitochondria. D) have twitches with a very brief contraction phase. E) have low resistance to fatigue and quick twitches.
What characteristic do simple diffusion and facilitated diffusion share?
A. Both require cellular energy for the transport of substances. B. Both move a substance from a region of higher concentration to one of lower concentration without using cellular energy. C. Both move water across a semipermeable membrane. D. Both require a special carrier molecule to move substances across the membrane.
In which layer does one find numerous blood capillaries that supply oxygen and glucose to muscle cells?
A. Endomysium B. Perimysium C. Epimysium D. Fascia E. Sarcolemma