Houston Community College - Northwest
Anatomy & Physiology I
Pro: Manhal Chbat, MD

Self Quiz Ch10

 1. How does muscle tissue contribute to homeostasis?
 A) by generating heat that helps maintain body temperature
 B) by moving materials through the body
 C) by pulling on bones to move the body
 D) A and B are correct.
 E) A, B and C are correct.

 2. Skeletal muscle
 A) is striated.
 B) is largely under voluntary control.
 C) is primarily regulated by hormones from the endocrine system.
 D) A and B are correct.
 E) A, B and C are correct.

 3. The ability to respond to stimuli by producing action potentials
 A) is called electrical excitability.
 B) is a property of muscle tissue.
 C) is not exhibited by nervous tissue.
 D) A and B are correct.
 E) A, B and C are correct.

 4. The ability of a muscle tissue to stretch without being damaged is called
 A) electrical excitability.
 B) contractility.
 C) extensibility.
 D) irritability.
 E) elasticity.

 5. A muscle fiber (myofiber) is a muscle
 A) contractile unit.
 B) cell.
 C) protein.
 D) sarcomere.
 E) A and B are correct.

 6. An adult has more muscle mass than a child. How did that increase in muscle mass occur?
 A) atrophy
 B) dysplasia
 C) hyperplasia
 D) dystrophy
 E) hypertrophy

 7. The sarcoplasmic reticulum of muscle tissue
 A) stores Ca2+ ions required for muscle contraction.
 B) is called rough endoplasmic reticulum in other tissues.
 C) is part of the transverse tubule.
 D) is a thread of protein running the length of the muscle cell.
 E) removes Ca2+ from the sarcoplasm so that an action potential can be generated.

 8. Muscular atrophy
 A) is in increase in muscle mass due to increased numbers of myofibrils.
 B) is an increase in muscle mass due to increased numbers of myofibers.
 C) is a decrease in muscle mass due to loss of myofibrils.
 D) is the result of overuse of muscles.
 E) is always reversible, no matter what the cause.

 9. Thick filaments
 A) are composed primarily of myosin.
 B) are able to convert mechanical energy into chemical energy.
 C) are primarily regulatory proteins.
 D) are primarily structural proteins.
 E) are composed of different types of proteins that appear as beads on a string.

 10. Thin filaments
 A) are composed of titin.
 B) are connected to the M lines.
 C) are able to convert chemical energy to mechanical energy.
 D) are composed of actin, troponin and tropomyosin.
 E) are the proteins that anchor thick filaments to the Z discs.

 11. A neuromuscular junction (NMJ)
 A) is the synapse of a motor neuron with a muscle fiber.
 B) includes the synaptic end bulbs of the muscle fiber.
 C) includes the motor endplates of the motor neuron.
 D) uses Na+ as a neurotransmitter.
 E) All of the above are correct.

 12. Place the events at the neuromuscular junction (NMJ) in the order in which they occur:
     1. release of acetylcholine (ACh)
     2. activation of ACh receptors on motor endplate
     3. termination of ACh activity by acetylcholinesterase (AChE)
     4. arrival of an action potential at the synaptic end bulb 
     5. diffusion of ACh across the synaptic cleft
     6. opening of Na+ channels in the motor endplate
     7. production of muscle fiber action potential
 A) 4, 1, 2, 5, 6, 7, 3
 B) 4, 1, 5, 6, 2, 7, 3
 C) 4, 1, 5, 2, 7, 6, 3
 D) 4, 1, 5, 2, 3, 7, 6
 E) 4, 1, 5, 2, 6, 7, 3

 13. How do muscle fibers produce ATP?
 A) from creatine phosphate
 B) through anaerobic cellular respiration
 C) through aerobic cellular respiration
 D) A and B are correct.
 E) A, B and C are correct.

 14. Aerobic cellular respiration
 A) converts the pyruvate from glycolysis into CO2, H2O, heat and ATP.
 B) occurs in the mitochondria.
 C) requires O2, which can be obtained from hemoglobin or myoglobin.
 D) is required for muscle activities lasting longer than one minute.
 E) All of these are correct.

 15. Smooth muscle tissue
 A) may be stimulated to contract by hormones.
 B) has briefer contractions than skeletal muscle tissue.
 C) uses calmodulin to remove Ca2+ from the cytoplasm.
 D) A and C are correct.
 E) B and C are correct.

Use the following to answer questions 16-18.
Choose the answer that best matches the description or term.
A) contractility
B) elasticity
C) electrical excitability
D) extensibility
E) thermogenic

 16. property allowing muscle tissue to return to its original shape

 17. function of muscle; heat generation

 18. property allowing muscle to shorten forcefully when stimulated by an action potential

Use the following to answer questions 19-20.
Choose the answer that best matches the description or term.
A) A band
B) H zone
C) I band
D) M line
E) Z discs

 19. site where thick and thin filaments overlap each other

 20. site where support proteins attach to thick filaments to each other

Answer Key - Untitled Exam-3

 1. E 
 2. D 
 3. D 
 4. C 
 5. B 
 6. E 
 7. A 
 8. C 
 9. A 
 10. D 
 11. A 
 12. E 
 13. E 
 14. E 
 15. D 
 16. D
 17. E
 18. A
 19. A
 20. D