BTEC Muscle Contraction

What is the primary function of muscles in the body?

• To store energy

• To produce hormones

• To facilitate movement

• To protect organs

How are muscle cells adapted for their function?

• They have a single nucleus

• They are short and wide

• They contain many mitochondria

• They lack a cell membrane

What is anaerobic respiration?

• Respiration using oxygen

• Respiration without oxygen

• Respiration in plants

• Respiration in the presence of light

What is a multinucleate fibre?

• A fibre with a single nucleus

• A fibre containing many nuclei

• A fibre without any nuclei

• A fibre with two nuclei

What is the main feature of skeletal muscle fibers?

• Non-striated, spindle-shaped, and uninucleated

• Striated, tubular, and multinucleated

• Striated, branched, and uninucleated

• Non-striated, tubular, and multinucleated

Where are smooth muscles usually located?

• Attached to the skeleton

• Covering walls of the heart

• Covering walls of internal organs

• In the brain

Which type of muscle is voluntary?

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

• All of the above

What is the basic unit of a muscle fibre?

• Sarcoplasm

• Sarcomere

• Sarcolemma

• Myofibril

Which type of muscle fibre helps you move faster but for shorter periods?

• Slow-twitch muscle fibres

• Fast-twitch muscle fibres

• Myofibril fibres

• Myofilaments

What type of energy system do slow-twitch muscle fibres use?

• Anaerobic energy system

• Aerobic energy system

• Glycolytic energy system

• Phosphagen energy system