APPLIED RADIOLOGICAL ANATOMY

ANATOMY

MUSCULOSKELETAL AND SOFT TISSUE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Involuntary muscles include which of the following muscle types?
A
Smooth & cardiac muscle
B
Cardiac & epithelial muscle
C
Epithelial & nervous muscle
D
Skeletal & cardiac muscle
Explanation: 

Detailed explanation-1: -Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.

Detailed explanation-2: -Unlike skeletal muscle, smooth muscle is capable of maintaining tone for extended periods and often contracts involuntarily. At a cellular level, smooth muscle can be described as an involuntary, non-striated muscle.

Detailed explanation-3: -Smooth muscle and Cardiac muscles are involuntary muscles which are found in organs where voluntary movement is impossible, like the alimentary canal or the heart.

Detailed explanation-4: -Smooth muscle cannot be controlled consciously and thus acts involuntarily. The non-striated (smooth) muscle cell is spindle-shaped and has one central nucleus. Smooth muscle contracts slowly and rhythmically.

There is 1 question to complete.