Question

How does smooth muscle tissue differ from skeletal muscle? check all that apply. appearance structure function size

Answer 1

Smooth muscle tissue is nonstriated with spindle-shaped cells and a single nucleus, and functions involuntarily in hollow organs. Skeletal muscle tissue has a striated appearance, cylindrical and multinucleated fibers, and controls voluntary movements.

Step-by-step explanation:

Smooth muscle tissue differs from skeletal muscle tissue in several key ways. Appearance-wise, skeletal muscle appears striated due to the regular arrangement of actin and myosin filaments within the sarcomeres, giving it a striped look. This is in contrast to smooth muscle's uniform appearance because it does not contain sarcomeres, and the actin and myosin are not regularly arranged. When it comes to structure, the cells that make up smooth muscle, called myocytes, are spindle-shaped and have a single nucleus, while the fibers of skeletal muscle are multinucleated and cylindrical.

In terms of function, skeletal muscle is involved in locomotion and movements that can be consciously controlled, making it a voluntary muscle. Smooth muscle, however, is found in the walls of hollow organs such as the intestines and blood vessels, and its contractions are not under conscious control, hence it is considered an involuntary muscle.

Skeletal muscle fibers are generally larger in size compared to the smaller myocytes of smooth muscle. This size difference is related to the different functions and locations of these muscle tissues in the body.

Answer 2

Skeletal muscles are striated and under voluntary control, with a regular, striped appearance under a microscope, while smooth muscles control involuntary movements, are found in hollow organs, and appear nonstriated due to the lack of sarcomere arrangement.

Step-by-step explanation:

Skeletal and smooth muscles are two types of muscle tissue with distinct characteristics. Skeletal muscle tissue forms the skeletal muscles that attach to bones or skin, and it is under voluntary control, which means it can be consciously controlled to perform movements. This type of muscle is striated, due to its cells being arranged in a precise, regular pattern that contributes to its striped appearance under a microscope. In contrast, smooth muscle tissue is found in the walls of hollow organs, such as the intestines and stomach, and it controls involuntary movements. Smooth muscle is not striated because its cells are not arranged in the same regular pattern as skeletal muscle, resulting in a uniform, nonstriated appearance under a microscope. Myocytes, the cells of smooth muscle, have myofibrils with actin and myosin filaments that cause contractions without the striated organization of sarcomeres found in skeletal muscles.