Muscle Structure and Function

Which protein is responsible for forming the thin filaments in muscle fibers?

• Myosin
• Actin
• Troponin
• Elastin

The basic functional unit of skeletal muscle tissue is the:

• Myofibril
• Sarcomere
• Z-line
• Muscle fiber

Which type of muscle tissue is found in the walls of blood vessels?

• Cardiac muscle
• Skeletal muscle
• Smooth muscle
• Striated muscle

The sliding filament theory explains:

• How ATP is produced in muscles
• How muscles store calcium
• How muscles contract and relax
• How tendons attach to bones

Which muscle type is under conscious control?

• Smooth muscle
• Cardiac muscle
• Involuntary muscle
• Voluntary muscle

Myosin molecules form what are known as:

• Z-lines
• Thick filaments
• Thin filaments
• I-bands

What type of muscle tissue has intercalated discs?

• Smooth muscle
• Cardiac muscle
• Skeletal muscle
• Voluntary muscle

Tendons primarily consist of:

• Muscle tissue
• Nervous tissue
• Collagen fibers
• Blood vessels

Which muscle type is found in the digestive tract?

• Skeletal muscle
• Striated muscle
• Smooth muscle
• Cardiac muscle

During muscle contraction, which statement is true?

• The H zone increases in size
• The I band gets wider
• The A band length stays constant
• The sarcomere lengthens