1. The following is not under voluntary control:
a. Skeletal muscles.
b. Muscles of the face.
c. The muscles of the tongue.
d. Smooth muscles.
2. Endomysium
a. Contains smooth muscle fibers.
b. Surrounds each fascicle of a muscle.
c. Surrounds each muscle fiber.
d. Surrounds the entire muscle.
3. Z lines
a. Are electron lucent lines.
b. Bisect A bands.
c. Two sarcomeres are found between 2 successive Z line.
d. Function to anchor actin filaments.
*Prof. Dr. Azza R. El.Hadidy
100
, Department of Histology
4. Transverse tubules are characterized by all of the
following Except:
a. Are present in smooth muscle.
b. Are extensions of the sarcolemma.
c. Serve to transmit signals to myofibrils within the cell.
d. Form part of the triads found in skeletal muscle.
5. Cardiac muscle cells are characterized by all of the
following Except:
a. Are joined together end to end by intercalated discs.
b. Contract spontaneously (i.e. without external stimulus).
c. Branch.
d. Are not well vascularized.
6. When skeletal muscle contracts
a. The A band decreases in length.
b. The I band remains the same length.
c. The H band remains the same length.
d. The sarcomere decreases in length.
101
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