Which of the following is not characteristic of smooth muscle?
A) The striations are due to the orderly arrangement of actin and myosin.
B) Neurons that innervate smooth muscles are under involuntary control.
C) Smooth muscle cells are uninucleate.
D) Smooth muscles do not contain sarcomeres.
E) The thin filaments of smooth muscle fibers are attached to dense bodies.
A
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Which joint actions should be used to discern the extensor digitorum longus and fibularis longus from each other?
a. Dorsiflexion and plantarflexion of the foot at the ankle joint b. Inversion and eversion of the foot at the subtalar joint c. Abduction and adduction of the toes at the metatarsophalangeal joints d. Flexion and extension of the leg at the knee joint
The thoracic cage forms a semirigid chamber that can increase and decrease in volume during respiration.
Indicate whether the statement is true or false.
Where is the G-protein complex when a regulatory molecule is not bound to its receptor?
A. The three subunits are together but not attached to the inner surface of the receptor. B. The beta and gamma subunits are attached to the inner surface of the receptor. C. The three subunits are together AND attached to the inner surface of the receptor. D. The alpha subunit is attached to the inner surface of the receptor.
What influences the appearance and function of skeletal muscle?
A) presence of endomysium around muscle cells B) presence of perimysium around fascicles C) arrangement of the pattern of fascicles D) number of muscle cells in a motor unit