33. Muscles are classified either as striated/smooth or voluntary the somatic ne

Question

33. Muscles are classified either as striated/smooth or voluntary the somatic nervous untary/involuntary. Which of them is innervated by a. unstriated b, involuntary c. voluntary 34, what % of skeletal muscle fibers consist of myofibrils? a. 80 b. 70 c. 60 35. True or false: Myosin is not part of a myofibril. a. True b. False 36. True or false: Myosin is considered to be thicker than actin. a. True b. False 37. Which of these describes the area between 2 Z lines and is considered the functioning unit of muscle? a. Myofibril b. M lines 38. Why is the protein Titin so significant to the muscle system of the human body? a. It helps muscle stretched by external force passively recoil back to its resting length. b. It helps the functioning unit of the muscle bind to troponin and hold tropomyosin onto the globular head of myosin where actin and ATP binding sites are present. It does not allow muscle to be stretched. Instead it aids in active recoil that requires additional ATP c. 39. Thin filaments consist of 3 protcins. Which one is responsible for stabilizing tropomyosin? a. actin b. troponin c. actin and troponin 40. Which of these forms the back bone of the thin filament? a. actin b. troponin c. actin and troponin 41. During muscle contraction which of these competes with troponin? a. Ca+ b. Na+ c. Phosphate 42. Skeletal muscles are stimulated to contract by. a. b. c. Acetycholine stored in the synaptic knob of a neuromuscular junction. Cat acting on myosin and the eventual power stroke. AP's stored in the synaptic knob of the neuromuscular junction. 43. Prior to reaching the synaptic knob, which of these travels down the axon hillock? a. Acetycholine b. AP c. Cat

Explanation / Answer

33. Somatic nervous system innervates

C. Voluntary muscles

34. What percent of skeletal muscle consists of myofibrils

C. 60 percent

35. Myosin is not a part of myofibril

False

Myofibrils consists of proteins like actin ,myosin etc.

36. Myosin considered as thocker than actin

True.

Myosin is thicker than actin hence called thick filament.

37. Area between 2 Z lines

Sarcomere

It is defined as the functionaing unit of muscle cell

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