A) transports hormones and nerve impulses from the hypothalamus to the posterior

Question

A) transports hormones and nerve impulses from the hypothalamus to the posterior pituitary B) All apply. C) transports nerve impulse from the hypothalamus to the anterior pituitary D) transports releasing hormones from the hypothalamus to the anterior pit uitary 27) During concentric isotonic contraction of a skeletal muscle fiber, which of these occurs? A) I bands shorten B) thin filaments shorten C) A bands shorten D) A bands lengthen E) sarcomeres lengthen 28) Which of the following statements regarding contraction of a skeletal muscle fiber is TRUE? Contraction does not always require the occurrence of an action potential. B) Contraction only occurs following summation of action potentials from many motor neurons. C) Some contractions occur without cross-bridge activation. D) Thick filaments shorten when muscle cells contract. E) Contracting muscle fibers do not always shorten. 29) Which best describes "rigor mortis"? A) Lack of ATP following death causes calcium to remain in the cytosol, continuously B) Lack of AT C) Following death, calcium-activated proteases degrade all proteins in skeletal muscle fibers D) stimulating cross-bridge cycling. P following death causes cross-bridges to remain tightly bound to actin. making muscles limp Build-up of K+ in T-tubules causes constant, tetanic contractions of skeletal muscles that last for about 12 hours following death. E) Repeated, high-frequency action potentials to a skeletal muscle fiber causes sustained contraction following death. 30) The removal of calcium ions from the cytosol of skeletal muscle causes to change conformation a nd thereby expose cross-bridge binding sites. A) troponin B) the myosin binding sites on actin to be uncovered by tropomyosin. C) None of the choices is correct. D) tropomyos in to change conformation and thereby move troponin molecules over cross-bridge binding sites. E) the myosin binding sites on actin to be covered by tropomyosin.

Explanation / Answer

Ans.26 Correct answer is D .

Hypothalmo hypophyseal tract is basically responsible for transporting releasing hormone from arcunate nucleus to the anterior pitutiary gland

Ans. 27 I band shortens. As in isotonic concentric contraction muscle shortens.

Ans.28 E is correct.

Contracting does not always result in shorteing.

Ans. 29. A is correct .

Ans 30 D is correct

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