, Bio 227 Lab 2 Exam Cory Hanley; Questions
and Answers 100% Correct
Sternoleidomastoid Answer-Flexes neck, rotates head toward shoulders
Mentalis Answer-Wrinkles chin
Sarcomere Answer-Single unit of contraction, Z-disc to Z-disc
Thin filaments are made of? Answer-Actin
Thick filaments are made of? Answer-Myosin
I-band of sarcomere Answer-Light,
A-band of sarcomere Answer-Dark
H-zone Answer-M-line located in the middle, when muscle contracts this disappears
Myofibrils Answer-Composed of two myofilaments (actin and myosin)
Epimysium Answer-Connective tissue that goes around whole muscle
, Bio 227 Lab 2 Exam Cory Hanley; Questions
and Answers 100% Correct
Fascicle Answer-Groups of individual muscle fibers (cells), wrapped in perimysium
Neuromuscular Junction Answer-The junction between a nerve fiber (specifically an
axon) and a muscle cell.
Synaptic cleft Answer-Space between axon terminal and muscle fiber
Motor Unit Answer-One neuron that branches very extensively contacting many different
muscle fibers
Agonists Answer-Muscle producing the movement
Antagonists Answer-Muscles that oppose movement
Synergists Answer-Muscle that stabilizes movement
Pectoralis major Answer-Flexes, adducts and medially rotates arm
Serratus anterior Answer-Rotates scapula
Deltoid Answer-Abducts arm
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