
Concept explainers
Match each numbered item with the most closely related lettered item.
skeletal muscle....................................

To review:
Match the term skeletal muscle to the most closely related descriptions given below:
(a) All epithelia.
(b) Single cell layer.
(c) Urinary bladder.
(d) Cell destroyed.
(e) Connective tissue component.
(f) Unicellular, exocrine gland.
(g) Tendon.
(h) Wandering cell.
(i) Lacunae.
(j) Striated.
Introduction:
Skeletal muscles connect to the skeletal system of the body, which help in the movement of various body parts. These muscles are made up of repeated units of the sarcomere, which in turn are made of proteins-actin and myosin fibers. The functional unit of skeletal muscle, which helps in the contraction and relaxation, is sarcomere.
Explanation of Solution
The actin and myosin filaments are thin and thick filaments, respectively, which slide past each other during contraction and relaxation of the skeletal muscles. The line where actin and myosin overlap is called Z lines forming the dark band. The region between these two Z lines is the sarcomere.
The skeletal muscles are considered to be striated because of the presence of these alternating filaments of actin and myosin. Striated muscle is one of the three categories of muscles other than cardiac and unstriated muscles. These muscles are under voluntary control of somatic nervous system and are responsible for movements of our body parts.
Therefore, it can be concluded that skeletal muscles can be correctly matched with option (j) i.e. striated.
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Chapter 3 Solutions
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