Muscles

The video explains the functions and structures of muscles, highlighting three types: skeletal, smooth, and cardiac. Skeletal muscles are voluntary and striated, with fast and slow twitch types. Smooth muscles line organs and are involuntary, as are cardiac muscles, which power the heart. Each muscle type has unique roles and characteristics.

What are muscles primarily composed of?

• Water and electrolytes

• Vitamins and minerals

• Actin and myosin protein chains

• Carbohydrates and fats

Which type of muscle is responsible for voluntary movements?

• Smooth muscles

• Cardiac muscles

• Involuntary muscles

• Skeletal muscles

What is a characteristic of fast twitch muscles?

• They contract slowly and tire easily

• They contract quickly and tire quickly

• They are responsible for endurance activities

• They are found in the heart

Which muscles are found in the lining of organs and blood vessels?

• Skeletal muscles

• Cardiac muscles

• Smooth muscles

• Voluntary muscles

What is a unique feature of cardiac muscles?

• They are attached to bones

• They work continuously without tiring

• They can tire easily

• They are under voluntary control