Muscle Questions - Set #1

1) Define Tone in muscles.
2) What do we call a motor unit?
3) How do you define smooth muscle movements?

4) What occurs when a muscle sheath is depolarized?
a) The membrane allows nutrients to enter the cell.
b) The cytoplasm is flooded with calcium ions
c) The H-line lengthens and the muscle tone is increased.

5) T/F – Functional unit of a skeletal muscle is called a sarcolemma.

6) The boundaries of a functional unit of a skeletal muscle is called:
a) A-Line
b) I-Line
c) Z-Line
d) H-Line

7) T/F – Muscles create heat by aerobic respiration in mitochondria.

8) Muscles can be named by their shapes. Give the Latin term that would indicate the following shapes of muscles:
a) Long
b) Lateral
c) Diagonal
d) Triangular
e) Saw-toothed
f) Diamond
g) Circular

9) Which is more mobile – insertion or origin of the muscle?
10) What is another name for rhomboidus major?
11) When naming a muscle by the origin and insertion, which begins the name – origin or insertion?
12) T/F – As you age, the number of muscle cells increases.
13) T/F –The type and number of muscle cells is determined by your diet and exercise patterns.
14) T/F –If a muscle is cut, it will become flaccid and atrophy.
15) T/F –If you do exercises that contract your muscles without changing the length, you are doing isotonic exercises.
16) T/F – One muscle can have areas of contractions and relaxations occur at the same time.

17) The number of mitochondria in the average muscle cell is:
a) 1000
b) 250
c) 500
d) 300
e) 3500

18) T/F – Smooth muscles contain sarcomeres.

19) A neuromuscular unit consist of :
a) Fused myoblasts with peripheral nuclei
b) Satellite cells and muscle cells
c) Muscle cell and nerve cell
d) Tensor and relaxor nerves
e) Extensors and adductors

20) T/F – Quadraceps femoris extends the knee.