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BIO201 | Topic 12: Spinal Cord, Spinal Nerves, Brain, and Cranial Nerves

Sarcoplasm is the:

Select one:
a. cytoplasm of a muscle fiber.
b. contractile thread that extends the length of the muscle fiber.
c. plasma membrane of a muscle fiber.
d. protein strand composed of actin or myosin.
e. structural and functional unit of the skeletal muscle fiber.



Answer :

GinnyAnswer

Final answer:

Sarcoplasm is the cytoplasm of a muscle fiber, housing the sarcoplasmic reticulum and essential contractile proteins such as myosin and actin.


Explanation:

Sarcoplasm is the cytoplasm of a muscle fiber. It is where the sarcoplasmic reticulum (SR) is located, a specialized form of endoplasmic reticulum that stores and releases calcium ions. The sarcomere is the smallest contractile unit of a muscle fiber, composed of thick filaments (myosin) and thin filaments (actin) which create the striations in muscle fibers.


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