Smooth muscle fibres are:
- cylindrical, unbranched, striated, multinucleate and voluntary
spindle- shaped, unbranched, non-striated, uninucleate and involuntary
- cylindrical, unbranched, non-striated, multinucleate and involuntary
- spindle-shaped, unbranched, striated, uninucleate and voluntary
The Correct Option is B
Approach Solution - 1
There are three types of muscular tissues - cardiac, smooth and skeletal. The smooth muscle fibers are found in the walls of the hollow visceral organs like pancreas, liver and intestine. The main function of the smooth muscle fibers is contraction. They are spindle-shaped and involuntary. The thin and thick filaments in smooth muscle fibers are not arranged into sarcomeres, resulting in a non-striated appearance. These fibers contains only one nucleus. Hence, option B is correct.
Approach Solution -2
The smooth muscle fibers and the tracts of the respiratory, urinary, and reproductive systems are bound to be found in the walls of hollow organs such as the liver, intestines, urinary bladder, and uterus, and in the walls of archways such as the veins and arteries of the circulatory system.
With the binding along with calcium directly to myosin and then rapidly cycling cross-bridges, producing force, contraction is also triggered in the invertebrate smooth muscle. There is a low-calcium and low-energy utilization capture process, which can be comparable to the vertebrate smooth muscle mechanism.
An involuntary, non-striated muscle is a smooth muscle. They are spindle-shaped, have a single nucleus in a central position, and striations are absent.
Therefore, the correct answer is option ‘B’.
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Concepts Used:
The Musculoskeletal System
The musculoskeletal system comprises bones, cartilage, ligaments, tendons, and connective tissues. The skeleton contributes a framework for the muscles and other soft tissues. Together, they hold up our body’s weight, maintain our posture and help us move.
The parts of the musculoskeletal system are:
- Bones: Bones of all shapes and sizes support our body, protect organs and tissues, store calcium and fat, and make blood cells. A bone’s hard outside shell encircling a spongy center. Bones provide structure and form for our bodies. They work with muscles, ligaments, tendons, and other connective tissues to help you move.
- Cartilage: Cartilage cushions bones inside our joints, along our spine, and in our ribcage. Firm, rubbery cartilage secures bones from rubbing against each other. We also have cartilage in our nose, ears, pelvis, and lungs.
- Joints: Bones come together to build joints. Some of the joints have a large range of motion like the ball-and-socket shoulder joint. Other joints such as the knee allow bones to move back and forth but not rotate.
- Muscles: Each muscle is made of thousands of extending fibers. our muscles allow us to move, sit upright and stay still. Some muscles help us to run, dance and lift. We use others to write our name, fasten a button, talk and swallow.
- Ligaments: Made of tough collagen fibers, ligaments attach bones and help stabilize joints.
- Tendons: Tendons associate muscles with bones. Made of fibrous tissue and collagen, tendons are resilient but not very stretchy.