Biology 110 Student Self Assessment Chapter 6
1. The muscle tissue that is classified as involuntary is (are) _______.
a. cardiac muscle only
b. smooth muscle only
c. skeletal muscle only
d. cardiac and smooth muscle
e. cardiac and skeletal muscle
2. The muscle tissue that consists of single, very long, cylindrical, multinucleate cells with very
obvious striations is ________.
a. cardiac muscle only
b. smooth muscle only
c. skeletal muscle only
d. cardiac and smooth muscle
d. cardiac and skeletal
3. Which of the following groupings is INCORRECT?
a. striated muscle, cylindrical cells, attached to the skeleton, involuntary
b. smooth cells, single nucleus, walls of hollow organs, involuntary
c. striated muscle, intercalated discs, branching cells, heart
d. cardiac muscle, slow contraction speed, rhythmic, uninucleated
e. skeletal muscle, arrhythmic, variable contraction speed, multinucleated
4. Which of the following connective tissues surrounds an individual muscle cell?
a. perimysium
b. endomysium
c. epimysium
d. fascicle
e. sarcolemma
5. Which of the following is NOT a function of the muscular system?
a. producing movement
b. maintaining posture
c. stabilizing joints
d. generating heat
e. hematopoiesis
6. A sarcomere is _______.
a. the nonfunctional unit of skeletal muscle
b. the area between two Z lines
c. the area between two intercalated discs
d. the wavy lines on the cell, as seen in a microscope
e. a compartment in a myofilament
7. Which of the following is (are) composed of myosin?
a. thick filament
b. thin filament
c. all myofilaments
d. Z lines
e. light bands
8. Which of the following groups of terms is placed in order from largest to smallest?
a. myofilament, myofibril, fiber, fascicle
b. fiber, myofibril, myofilament, fascicle
c. fascicle, fiber, myofilament, myofibril
d. fascicle, fiber, myofibril, myofilament
e. fiber, myofibril, fascicle, myofilament
9. A motor unit consists of _____.
a. a skeletal muscle and all the neurons that supply it
b. a nerve and all of the skeletal muscles supplied by it
c. all of the neurons that stimulate a single action
d. all of the skeletal muscles that accomplish a single movement
e. a neuron and all of the skeletal muscle fibers that it stimulates
10. The mechanical force of contraction is generated by ______.
a. shortening of the thick filaments
b. shortening of the thin filaments
c. a sliding of thin filaments past thick ones
d. the “accordian-like” folding of thin and thick filaments
e. the temporary disappearance of thin filaments
11. Acetylcholine is ______.
a. an ion pump
b. a source of energy for muscle contraction
c. a component of thick myofilaments
d. an oxygen binding protein
e. a neurotransmitter
12. An elaborate network of membranes in skeletal muscle cells that function in calcium storage
is the __________.
a. sarcolemma
b. mitochondria
c. intermediate filament network
d. myofibrillar network
e. sarcoplasmic reticulum
13. The striations of a skeletal muscle cell are produced, for the most part, by ____.
a. a difference in the thickness of the sarcolemma
b. the arrangement of myofilaments
c. the sarcoplasmic reticulum
d. the T tubules
e. the “cocked” positions of the heads of the thick filaments
14. A muscle twitch differs from a tetanic contraction in that _____.
a. the tetanic contraction is considered abnormal, while the twitch is a normal muscle
response
b. the tetanic contraction is caused by single stimulus, while the twitch is caused by
very rapid multiple stimuli
c. the muscle twitch is prolonged and continuous while a tetanic contraction is brief
and “jerky”
d. the muscle twitch occurs only in small muscles while a tetanic contraction occurs in
large muscle groups
e. the muscle twitch is a brief and “jerky” movement, while the tetanic contraction is
prolonged and continuous
15. The condition of muscle fatigue can be best explained by _______.
a. the all-or-none law
b. the inability to generate sufficient quantities of ATP due to feedback regulation
of synthesis
c. insufficient intracellular quantities of ATP due to excessive consumption
d. a total lack of ATP
16. Observe the list of muscle actions below. Which of them would NOT be classified as an
ISOTONIC contraction?
a. pushing against a stationary wall b. lifting a glass of water to one’s mouth
c. writing a letter
d. tying one’s shoe
e. throwing a ball
17. Muscle tone is _______.
a. the feeling of well-being following exercise
b. the ability of a muscle to maintain a contraction against an outside force
c. the condition of athletes after intensive training
d. a state of sustained partial muscular contraction that is vital for the health of muscles
e. the result of increased neuromuscular system coordination and increased metabolic rate
18. Creatine phosphate functions in the muscle cell by _______.
a. forming a temporary chemical compound with myosin
b. forming a chemical compound with actin
c. inducing a conformation change in the myofilaments
d. storing energy that will be transferred to ADP to resynthesize ATP as needed
e. storing energy that will be transferred to ATP to resynthesize ADP as needed
19. After nervous stimulation of the muscle cell has ceased, the calcium _______.
a. is destroyed by cholinesterase
b. is chemically bound to the filaments
c. is reabsorbed into the sarcoplasmic reticulum
d. is actively pumped into the extracellular fluid for storage until the next contraction
e. leaves the cell by diffusion
20. In muscle contraction, calcium apparently acts to _______.
a. increase the action potential transmitted along the sarcolemma
b. release the inhibition on Z lines
c. expose myosin binding sites on the actin
d. cause ATP binding to action
e. bind to regulatory proteins on the myosin filaments, changing both their shape
and their position on the thick filaments