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CSCS Practice Test
Exercise Sciences
CSCS
Exercise Sciences Practice Test
Question 1 of 3
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The basic unit of muscle called:
A
sarcomere
B
myocyte
C
myofibril
D
myofiber
A sarcomere is the basic unit of a muscle. Muscles are composed of tubular muscle cells (myocytes or myofibers) which are made up of tubular myofibrils. Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as dark and light bands. Sarcomeres are composed of long, fibrous proteins that slide past each other when the muscles contract and relax.
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