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Exam 9: Muscles and Muscle Tissue

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Question 21

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Figure 9.2 Using Figure 9.2, match the following: -M line.

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Question 22

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The end of the muscle that typically moves when a muscle contracts is called the ________.

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Figure 9.1 Using Figure 9.1, match the following: -Individual muscle fiber.

Match the following: A) Tetanus B) Muscle tone C) Maximal stimulus D) Wave summation E) Multiple motor unit summation -Continued sustained smooth contraction due to rapid stimulation.

Briefly, what causes rigor mortis?

Figure 9.2 Using Figure 9.2, match the following: -H zone.

What is the functional unit of a skeletal muscle called?

Smooth muscles relax when intracellular Ca²⁺ levels drop but may not cease contractions.

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?

Muscle tone is the small amount of tautness or tension in the muscle due to weak, involuntary contractions of its motor units.

During isometric contraction, the energy used appears as movement.

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

What are caveolae?

An anaerobic metabolic pathway that results in the production of two net ATPs per glucose plus two pyruvic acid molecules is ________.

An increase in the calcium ion level in the sarcoplasm starts the sliding of the thin filaments. When the level of calcium ions declines, sliding stops.

Match the following: A) Acetylcholine B) Acetylcholinesterase C) Creatine phosphate D) Sodium ions E) Calcium ions -Serves as the actual "trigger" for muscle contraction by removing the inhibition of the troponin molecules.

Only ________ muscle cells are always multinucleated.

Muscle tone is ________.

Define physiologic muscle fatigue.

Which of the following would be recruited later in muscle stimulation when contractile strength increases?