anatomy and physiology Ch 10 and 11

24. Before a muscle fiber can contract, Ca2+ must bind to A) calsequestrin B) the myosin head C) tropomyosin D) troponin E) actin

A) calsequestrin

3. Which of these is NOT a supraphyoid muscle? A) genioglossus B) geniohyoid C) stylohyoid D) mylohyoid E) digastric

A) genioglossus

8. Which of the following muscles does NOT extend the hip joint? A) quadriceps femoris B) gluteus maximus C) biceps femoris D) semitendinosus E) semimembranosus

A) quadriceps femoris

21. To make a muscle contract more strongly, the nervous system can activate more motor units. This process is called A) recruitment B) summation C) incomplete tetanus D) twitch E) concentric contraction

A) recruitment

30. Slow oxidative fibers have all of the following except A) an abundance of myoglobin B) an abundance of glycogen C) high fatigue resistance D) a red color E) a high capacity to synthesize ATP aerobically

B) an abundance of glycogen

1. Which of the following muscles i the prime mover in spitting out a mouthful of liquid? A) platysma B) buccinator C) risorius D) masseter E) palatoglossus

B) buccinator

7. Both the hands and feet are acted upon by a muscle or muscles called? A) the extensor digitorum B) the abductor digiti minimi C) the flexor digitorum profundus D) the abductor hallucis E) the flexor digitorum longus

B) the abductor digiti minimi

2. Each muscle fiber has a sleeve of areolar connective tissue around it called? A) the fascia B) the endomysium C) the perimysium D) the epimysium E) the intermuscular septum

B) the endomysium

23. Before a muscle fiber can contract, ATP must bind to A) a Z disc B) the myosin head C) tropomyosin D) troponin E) actin

B) the myosin head

28. Single-unit smooth muscle cells can stimulate each other because they have A) a latch-bridge B) diffuse junctions C) gap junctions D) tight junctions E) cross-bridges

C) gap junctions

29. A person with high VO2max A) needs less oxygen than someone with a low VO2max B) has stronger muscles than someone with low VO2max C) is less likely to show muscle tetanus than someone with a low VO2max D) has fewer muscle mitochondria than someone with low VO2max E) experiences less muscle fatigue during exercise than someone with a low VO2max

C) is less likely to show muscle tetanus than someone with a low VO2max

22. The functional unit of a muscle fiber is the ______, a segment from one Z disc to the next. A) myofibril B) I band C) sarcomere D) neuromuscular junction E) striation

C) sarcomere

4. Which of these muscles is an extensor of the neck? A) External oblique B) sternocleidomastoid C) splenius capitis D) iliocostalis E) latissimus dorsi

C) splenius capitis

10. Which of the following muscles raises the upper lip? A) levator palpebrae superioris B) orbicularis oris C) zygomaticus minor D) masseter E) mentalis

C) zygomaticus minor

9. Both the gastrocnemius and ______ muscles insert on the heel by way of the calcaneal tendon. A) semimembranosus B) tibialis posterior C) tibialis anterior D) soleus E) plantaris

D) soleus

27. ACh receptors are found mainly in A) synaptic vesicles B) terminal cisternae C) thick filaments D) thin filaments E) junctional folds

D) thin filaments

6. Which of these actions is NOT performed by the trapezius ? A) extension of the neck B) depression of the scapula C) elevation of the scapula D) rotation of the scapula E) adduction of the humerus

E) adduction of the humerus

25. Which of the following muscle proteins is NOT intracellular? A) actin B) myosin C) collagen D) troponin E) dystrophin

E) dystrophin

5. Which of these muscles of the pelvic floor is the deepest? A) superficial transverse perineal B) bulbospongiosus C) ischiocavernosus D) deep transverse perineal E) levator ani

E) levator ani

26. Smooth muscle cells have _____, whereas skeletal muscle fibers do not. A) sarcoplasmic reticulum B) tropomyosin C) calmodulin D) Z discs E) myosin ATPase

E) myosin ATPase

13. The origin of the sternocleidomastoid muscle is the mastoid process of the skull. True/false

False

17. The scalenes are superficial to the trapezius. True/false

False

18. Exhaling requires contraction of the internal intercostal muscles. True/false

False

19. Hamstring injuries often result from rapid flexion of the knee. True/false

False

20. The tibialis anterior and tibialis posterior are syngergists. True/false

False

31. Each motor neuron supplies just one muscle fiber. True/false

False

33. Slow oxidative fibers are relatively resistant to fatigue. True/false

False

35. Thing filaments do not change length when a muscle contracts. True/false

False

36. Smooth muscle lacks striations because it does not have thick and thin myofilaments. True/false

False

40. The heart and some smooth muscle are autorhythmic, but skeletal muscle is not. True/false

False

11. Cutting the phrenic nerves would paralyze the prime mover of respiration. True/false

True

12. The orbicularis occuli is a sphincter. True/false

True

14. To push someone away form you, you would use the serratus anterior more than the trapezius. True/false

True

15. Both the extensor digitorum and extensor digiti minimi extend the little finger.

True

16. Curling the toes employs the quadratus plantae. True/false

True

32. To initiate muscle contraction, calcium ions must bind to the myosin heads. True/false

True

34. Thin filaments are found in both the A bands and I bands of striated muscle. True/false

True

37. A muscle must contract to the point of complete tetanus if it is to move a load. True/false

True

38. If not ATP were available to a muscle fiber, the excitation stage of muscle action could not occur. True/false

True

39. For the first 30 seconds of an intense exercise, muscle gets most of its energy from lactic acid. True/false

True