Bio Week 11

Which of the following is NOT a recognised function of muscle?

• Produce movement

• Maintain posture

• Maintain body temperature

• Facilitate temporary storage

• Production of red blood cells

The dense layer of connective tissue that surrounds an entire skeletal muscle is called the:

• Tendon

• Epimysium

• Endomysium

• Perimysium

• FascicleFascicle

Muscle cells are ‘excitable’ cells. This means that they:

• Respond to a stimulus and produce an action potential

• Release calcium from the sarcoplasmic reticulum

•  

  Can stretch without damaging the cell

• Return to their original shape after stretching

• Contract (shorten)

Where is the myofibril located in the labelled diagram of skeletal muscle below?

• Structure “A” is the myofibril.

• Structure “C” is the myofibril.

• Structure “G” is the myofibril.

• Structure “E” is the myofibril.

• Structure “F” is the myofibril.

Which of the following movements represents ADDUCTION?

• Movement A.

• Movement B.

•  

  Movement C.

• Movement D.

• Movement E

Which of the following statements about smooth muscle is CORRECT?

• Smooth muscle cells are under voluntary control, are multinucleated and contain sarcomeres.

• Smooth muscle cells are multinucleated, undergo slow wavelike contractions, and lack visible striations.

• Smooth muscle cells are striated, contain a single nucleus and do not contain sarcomeres.

• Smooth muscle cells are under involuntary control, are multinucleated and lack visible striations.

• Smooth muscle cells are under involuntary control, contain a single nucleus, lack visible striations and do not contain sarcomeres.

Skeletal muscle cells differ from  “typical” mammalian cells because:

• They lack a plasma membrane.

• They are very small in size.

• They contain multiple nuclei.

• They contain intercalated discs.

• They lack mitochondria.

Which of the following muscles is under INVOLUNTARY control?

• Muscle A.

• Muscle B.

• Muscle C.

• Muscles B and C.

• Muscles A and C.

Which of the following statements is CORRECT? During muscle contraction,                       :

• Actin (thin) filaments slide over myosin (thick) filaments.

• Actin (thick) filaments slide over myosin (thin) filaments.

• Myosin (thin) filaments slide over actin (thick) filaments.

• Myosin (thick) filaments slide over actin (thin) filaments.

• Myosin filaments become actin filaments.