Question 1

Which of the following is NOT a characteristic shared by all muscle tissue types?

Accepted Answer

Secretion

Question 2

A muscle fiber is best described as:

Accepted Answer

A multinucleate, elongated muscle cell

Question 3

Which connective tissue sheath surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During the sliding filament model of contraction, which event occurs at the sarcomere level?

Accepted Answer

Thin filaments slide past thick filaments

Question 5

Which equation correctly represents the regeneration of ATP from creatine phosphate (CP) in skeletal muscle?

Accepted Answer

$$\mathrm{CP} + \mathrm{ADP} \rightarrow \mathrm{Creatine} + \mathrm{ATP}$$

Question 6

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

ATP is no longer synthesized, preventing cross bridge detachment

Question 7

A motor unit consists of:

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Question 8

Which phase of a muscle twitch corresponds to cross bridge formation and peak tension?

Accepted Answer

Period of contraction

Question 9

Which process allows for smooth, graded contractions in skeletal muscle?

Accepted Answer

Recruitment of additional motor units

Question 10

Which of the following is TRUE regarding isometric contractions?

Accepted Answer

The muscle generates tension but does not change length

Question 11

Which type of skeletal muscle fiber is best suited for endurance activities such as marathon running?

Accepted Answer

Slow oxidative fibers

Question 12

Which of the following is a plausible cause of muscle fatigue during intense exercise?

Accepted Answer

Decreased ATP and increased magnesium interfering with T tubule proteins

Question 13

Excess postexercise oxygen consumption (EPOC) is required for all of the following EXCEPT:

Accepted Answer

Increasing lactic acid production

Question 14

Which of the following best describes the role of the sarcoplasmic reticulum in muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for contraction

Question 15

Which equation best represents the relationship between stimulus intensity and muscle tension?

Accepted Answer

$$T = \sum_{i=1}^{n} t_i$$

Question 16

Which of the following is TRUE about smooth muscle compared to skeletal muscle?

Accepted Answer

Smooth muscle contraction is mainly aerobic

Question 17

Which event occurs first during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Generation of an action potential along the sarcolemma

Question 18

Which of the following is a function of muscle tone?

Accepted Answer

Keeps muscles firm, healthy, and ready to respond

Question 19

Which statement best describes the difference between concentric and eccentric isotonic contractions?

Accepted Answer

Concentric contractions shorten the muscle, eccentric contractions lengthen it

Question 20

Which of the following is TRUE regarding the arrangement of myofilaments in a sarcomere?

Accepted Answer

Actin forms the thin filaments and myosin forms the thick filaments

Muscles and Muscle Tissue – Chapter 09 Study Notes

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