Question

Wall of internal organs (stomach, intestine, blood vessels) contain muscles
A. Striped
B. Cardiac
C. Smooth
D. None of the above

Answer 1

Hint: In the human body, muscles are classified into three types namely skeletal/striped, smooth and the cardiac muscles. The skeletal muscles contain multiple nuclei and have characteristic stripes on them, that is why they are called striated muscles. Smooth muscles lack the stripes and contain one nucleus. Cardiac muscles are striped and contain one nucleus.

Complete answer:
Let us see the features and the locations where each of the muscles in the options are present.
The first one is striped muscles or skeletal muscles. Skeletal muscles as the name suggests are present attached to the skeleton or the bones. These muscles are considered to be voluntary and they can be controlled by the individual. The main function of these muscles is movement of the body.
The next is the cardiac muscles. Cardiac muscles are involuntary muscles that cannot be controlled by humans voluntarily. These muscles are found on the walls of the heart and are involved in contraction and relaxation of the heart and are responsible for the pumping action. They are the strongest muscles and do not fatigue easily as the heart needs to be functioning throughout life.
The last muscle given is the smooth muscle. Smooth muscles are present in the hollow parts of the body such as intestines, stomach, oesophagus, blood vessels etc. They are involuntary muscles meaning they are not in the control of the individual. The smooth muscles help in contraction and relaxation of the stomach and intestine helping in pushing the food down the alimentary canal from mouth to the anus.

Hence, the right answer is option C – Smooth muscles.

Note:
When muscles fail to contract normally it leads to a disorder called muscle failure. If this happens you will not be able to move or do things normally and can also lead to paralysis. This happens mostly during accidents when the muscles are damaged very badly. When the heart muscles fail, the heart is unable to pump blood efficiently and the remaining organs are unable to receive enough blood.