41. Anemia results when the person\'s stomach fails to produce intrinsic factor,

Question

41. Anemia results when the person's stomach fails to produce intrinsic factor, which is necessary for the normal absorption of vitamin:

A.       K                  C.       B6

B.       B2                D.       B12

42. Action potentials in skeletal muscle fibers propagate down the special portion of the sarcolemma the -----------------and cause release of calcium from the-------------------

A. end plate, T-tubules

B. nerve terminal, T-tubules

C. T-tubules, sarcoplasmic reticulum

D. sarcoplasmic reticulum, T-tubules

43. Which of the following is typical of both cardiac and skeletal muscles?

A.       They surround hollow organs                 C.       Have a functional synctium

B.       Under voluntary control                         D.       They are striated

44. Rigor mortis results from ___________ after death.

A.       Lack of ATP in muscles

B.       Smaller motor units

C.       Excess acetylcholine in neuromuscular junctions

D.       Degeneration of muscles

E.        Malignant hyperthermia

Explanation / Answer

41.

The deficiency of B12 leads to pernicious anemia due to lack of intrinsic factor that stimulates absorption of B12. The pernicious anemia condition results in fatigue, degeneration of peripheral nerves causing paralysis. Option D is correct.

42.

The skeletal muscle is enclosed within plasma membrane called sarcolemma. The skeletal muscles generate action potnetials that are propagated by release of calcium ions (Ca2+ ions) from sarcoplasmic reticulum into specialized structures of sarcolemma called T-tubules. The option C is correct.

43.

Muscles are categorized in to striated like skeletal and cardiac muscles or unstriated like smooth muscle. Further muscles are categorized into voluntary muscle (skeletal muscle) or involuntary muscle (cardiac or smooth muscle) depending on the innervations of somatic nervous system. The common point between skeletal and cardiac muscles is that both are striated muscles. The option D is correct.

44.

The cross bridge cycle between myosin and actin is broken at the end though ATP is not split during the disassociation process. The requirement of ATP in separation of myosin and actin is shown in rigor mortis. This is known as stiffness of death resulted due to locking of skeletal muscles begins after 3 – 4 hours of death and completes in the 12 hours. Therefore, option A is correct.

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