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Exam 9: Muscles and Muscle Tissue

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Question 51

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Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking,breathing,and swallowing.What was his diagnosis?

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Aaron probably has myasthenia ...

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Question 52

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Which of the following describes the cells of unitary smooth muscle?

A) They exhibit spontaneous action potentials.
B) They are used for vision and hair raising.
C) They depend upon recruitment using the autonomic nervous system.
D) They consist of muscle fibers that are structurally independent of each other.

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Question 53

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Only ________ muscle cells commonly branch.

A smooth,sustained contraction from rapid stimulation is called ________.

How is it that norepinephrine (NE)can inhibit smooth muscle action in airways,yet stimulate contractions in smooth muscles everywhere else in the body?

Myoglobin ________.

If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise.Which of the following would you expect to happen?

Cardiac muscle has a limited regenerative capacity.

Although there are no sarcomeres,smooth muscle still possesses thick and thin filaments.

Gary was injured in an automobile accident that severed the motor neurons innervating his quadriceps.Even though he has had extensive physical therapy,he is still suffering muscle atrophy.Why is the therapy not working?

What structure in skeletal muscle cells functions in calcium storage?

A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate.

Which of the following is a factor that affects the velocity and duration of muscle contraction?

The nurse encourages the patient to do his own activities of daily living such as bathing,eating,dressing,and toileting activities.How do these activities promote physical conditioning?