B3.3 Muscle & motility

What is the sliding filament model of muscle contraction primarily based on?

• The role of titin protein

• The sliding of actin and myosin filaments

• The movement of calcium ions

• The contraction of antagonistic muscles

Which protein helps sarcomeres to recoil after stretching?

• Titin

• Calcium

• Myosin

• Actin

What type of skeleton do arthropods possess?

• Exoskeleton

• Hydrostatic skeleton

• Cartilaginous skeleton

• Endoskeleton

What is the primary role of antagonistic muscles?

• To stabilize joints

• To provide energy for contraction

• To allow for muscle relaxation

• To exert force when they contract

What is the function of synovial fluid?

• To connect bones

• To provide nutrients to muscles

• To store energy

• To lubricate joints

What is the primary function of the internal and external intercostal muscles?

• To stabilize the spine

• To facilitate internal body movements

• To support the ribcage

• To assist in digestion

What is a key adaptation for swimming in marine mammals?

• Development of lungs

• Streamlining of body shape

• Increased muscle mass

• Longer limbs

What is the role of motor units in skeletal muscle?

• To connect muscles to bones

• To transmit signals from the brain

• To facilitate muscle contraction

• To store energy

What is the primary reason for locomotion in animals?

• To maintain body temperature

• To escape from danger

• To enhance digestion

• To find shelter

What is the structure that connects motor neurons to muscle fibers?

• Synapse

• Neuromuscular junction

• Tendon

• Ligament