Muscle Function and Control

The video tutorial explains the muscular system, starting with a fictional example of skeletons. It describes how muscles are essential for movement, highlighting that bones cannot move without them. The tutorial covers the importance of muscles, noting that they make up about half of the body's weight and are crucial for various activities like running, jumping, and even breathing. It distinguishes between voluntary muscles, which can be controlled, and involuntary muscles, which function automatically, such as those in the heart and stomach.

Why can't bones move on their own?

• They lack muscles.

• They are part of the skeleton.

• They are too heavy.

• They are connected to joints.

What happens when you tighten the muscles in your arm?

• The arm becomes longer.

• The arm changes color.

• The bones in the arm move.

• The arm becomes heavier.

Approximately how many muscles are there in the human body?

• 500

• 800

• 650

• 1000

What percentage of body weight is made up of muscles?

• About 25%

• About 75%

• About 50%

• About 90%

What is the main function of muscles in the human body?

• To provide structure

• To facilitate movement

• To protect organs

• To produce blood cells

Which type of muscles can you control?

• Voluntary muscles

• Smooth muscles

• Cardiac muscles

• Involuntary muscles

What is a characteristic of involuntary muscles?

• They are only found in the arms and legs.

• They are responsible for facial expressions.

• They work automatically without conscious thought.

• They require conscious thought to move.

Which of the following is an example of a voluntary muscle action?

• Heart beating

• Picking up a box

• Breathing

• Digesting food

Which muscles are responsible for keeping the heart beating?

• Involuntary muscles

• Skeletal muscles

• Voluntary muscles

• Facial muscles

What role do stomach muscles play in digestion?

• They are not involved in digestion.

• They digest food automatically.

• They help in chewing food.

• They require conscious effort to digest food.