7.0 Muscular System

What is the term for a bundle of muscle fibers?

• Myofibrils

• Myofillament

• Fascicle

• Sarcomere

Role of ATP?

• ATP binding with Myosin is essentially to release cross-bridge

• Bruno Mars and Rose

• ATP supplies Ca²+ to myosin

• ATP Block Actin from binding with Myosin

Which type of muscle contraction involves multiple wave summation?

• Eccentric contraction

• Isometric contraction

• Tetanus

• Muscle twitch

What structure connects skeletal muscles to bones?

• Tendon

• Epimysium

• Perimysium

• Endomysium

What shape are smooth muscle cells?

• Spindle-shaped with a single nucleus

• Flat and irregular shape

• Branched shape with striations

• Cylindrical shape with multiple nuclei

What is the role of calcium ions during muscle contraction?

• To expose binding sites on actin for myosin interaction

• To stabilize the myosin heads during contraction

• To block the binding sites on actin

• To provide energy for muscle contraction

What is the function of the endomysium in muscle tissue?

• To surround bundles of muscle fibers

• To connect muscle to bone

• To support and protect individual muscle fibers

• To provide blood supply to the muscle

What neurotransmitter diffuses across the synaptic cleft at the neuromuscular junction?

• AcH

• Dopamine

• Norepinephrine

• Serotonin

Which type of muscle has striations and multiple nuclei?

• Smooth muscle

• Cardiac muscle

• Skeletal muscle

• Striations muscle

What phase follows the lag phase during a muscle twitch?

• Relaxation phase

• Latent phase

• Tetanus phase

• Contraction phase