ANATOMY

Detailed explanation-1: -A person would be unable to move or even stand up straight if they didn’t have any muscles. The heart would not be able to beat and the digestive tract could not do its job. There are basically three different types of muscles in the human body, notably smooth, cardiac and skeletal muscles.

Detailed explanation-2: -Disuse (physiologic) atrophy is caused by not using your muscles enough. If you stop using your muscles, your body won’t waste the energy it needs to take care of them. Instead, your body will start to break your muscles down, which causes them to decrease in size and strength.

Detailed explanation-3: -Muscles pull on the joints, allowing us to move. They also help the body do such things as chewing food and then moving it through the digestive system. Even when we sit perfectly still, muscles throughout the body are constantly moving.

Detailed explanation-4: -Definition of involuntary muscle: Involuntary muscles are the ones that do not move or contract under the conscious control of a person, i.e., these muscles work automatically. These muscles line the organs like the urinary bladder, blood vessels, stomach, intestine, etc.