Question 1

Which process is primarily responsible for the increase in muscle size observed in bodybuilders after resistance training?

Accepted Answer

Hypertrophy, the enlargement of existing muscle fibers

Question 2

Testosterone and human growth hormone stimulate muscle growth by promoting which cellular process?

Accepted Answer

Hypertrophy of existing muscle fibers

Question 3

What is the role of satellite cells in skeletal muscle tissue?

Accepted Answer

They regenerate damaged muscle fibers after injury

Question 4

During embryonic development, skeletal muscle fibers are formed by the fusion of which type of cells?

Accepted Answer

Myoblasts

Question 5

Which structure in a muscle fiber is responsible for conducting action potentials deep into the cell interior?

Accepted Answer

Transverse tubules (T tubules)

Question 6

The sarcolemma of a muscle fiber is best described as:

Accepted Answer

The plasma membrane of the muscle cell

Question 7

Which of the following statements about muscle fiber development is correct?

Accepted Answer

The number of skeletal muscle fibers is set before birth and most last a lifetime

Question 8

A patient suffers a muscle injury. Which cellular process is most likely to be activated to repair the damaged muscle fibers?

Accepted Answer

Activation and division of satellite cells

Question 9

Which of the following best explains why muscle action potentials can rapidly penetrate the interior of a muscle fiber?

Accepted Answer

Deep invaginations of the sarcolemma called transverse tubules

Question 10

If a mutation prevented the formation of myoblasts during embryonic development, which outcome would most likely occur?

Accepted Answer

Muscle fibers would fail to form, leading to severe muscle deficiency

Question 11

Which of the following is a direct result of hypertrophy in skeletal muscle?

Accepted Answer

Enlargement of existing muscle fibers

Question 12

Which structure is the plasma membrane of a muscle cell, and what is its primary function?

Accepted Answer

Sarcolemma; conducts action potentials along the muscle fiber

Question 13

Which of the following best describes the role of T tubules in muscle contraction?

Accepted Answer

They transmit action potentials from the sarcolemma into the cell interior

Question 14

A researcher is studying muscle regeneration after injury. Which cell type should they focus on to understand the repair process?

Accepted Answer

Satellite cells

Question 15

Which hormone is most likely to enhance muscle hypertrophy in athletes?

Accepted Answer

Testosterone

Question 16

Which of the following is NOT a function of the sarcolemma?

Accepted Answer

Storing calcium ions

Question 17

Which statement best describes the relationship between satellite cells and muscle hypertrophy?

Accepted Answer

Satellite cells can differentiate to repair muscle fibers, but hypertrophy is mainly enlargement of existing fibers

Question 18

Which of the following best explains why the number of skeletal muscle fibers is generally fixed before birth?

Accepted Answer

Muscle fibers cannot undergo mitosis after birth

Question 19

Which structure allows muscle action potentials to penetrate deep into the muscle fiber, ensuring coordinated contraction?

Accepted Answer

Transverse tubules (T tubules)

Question 20

Which of the following best describes the process by which muscle fibers are repaired after injury?

Accepted Answer

Satellite cells are activated, divide, and differentiate to repair damaged fibers

Muscle Tissue 2

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