Question

Differentiate between cells of:
Fibers of voluntary muscle and cardiac muscle

Answer 1

As we know muscle is a soft tissue that is found in both animals and humans. The cells of the muscles contain protein filaments of actin and myosin that slides past one another, which produces contraction and changes both the length as well as the shape of the cell. Muscles function by producing force and motion.

Complete answer:
Cardiac muscle is a specialized form of muscle that has evolved to continuously and repeatedly contract, thereby providing circulation of blood throughout the body. Cardiac muscle has a regular pattern of fibers which is similar to that of smooth muscles. These muscles consist of the cylindrical, branched fibers and a centrally located nucleus. The T-tubules or also called the transverse tubules are rich in ion channels and are found in the atrial muscle cells.

Voluntary muscles are the muscles that are under our conscious control while muscles that are not under your conscious control are called involuntary muscles.
There are mainly three types of muscles, which are;
a) Skeletal or striated muscles
b) Cardiac muscles
c) Smooth muscles
Based on the muscle action, muscles are further categorized into:
a) Voluntary muscles
b) Involuntary muscles

Properties	Voluntary muscle	Cardiac muscle
Shape	Cylindrical and long	Branched and short
Nucleated	Multinucleated	Uninucleated
Striation	Voluntary muscle is striated and contracts quickly and powerfully but tires quickly.	Cardiac muscle is striated and contracts powerfully throughout the life without tiring.
Nature	Under the person’s control	Not under anyone’s control.
Example	Legs, Arms, neck	Heart

Note: Cardiac muscles are found only in the heart and are considered to be self-stimulating. It has an intermediate speed of contraction and energy requirement and is not part of the musculoskeletal system. Voluntary muscles are made of cylindrical fibers and are attached to bones and the skin. They play an important role in allowing the body to move by contracting and relaxing and their actions are mainly under the control of the somatosensory nervous system.