Which of these is the best description of the sliding filament mechanism of musc

Question

Which of these is the best description of the sliding filament mechanism of muscle contraction? a. the thin and thick filament of a myofibril shorten to produce an overall shortening of the muscle b. the thick and thin filament slide past each other to produce a shorten muscle during contraction c. the thin filament of a myofibril slides perpendicular to the axis of the muscle to provide room for the contraction of the thick filament d. the thick and thin filaments coil around each other to produce a shortened muscle during contraction Where does blood go as it leaves the lungs? a. back to the heart through the pulmonary arteries b. back to the heart through the pulmonary veins c. to the body through the aorta d. back to the heart through the pulmonary trunk e. none of the above Which class of hormones most commonly alters DNA function directly in its target cells? a peptide b amine c steroid d all of the above e none of the above If scientists discovered a new hormone in the human body and the only thing they know about it was that it is secreted form the hypothalamus, what would its most probable target tissue be? (use what you know about well researched hormones) a. anterior pituitary b. posterior pituitary c. ovaries or testes d. adrenal glands e. thyroid gland TRUE or FALSE: Testosterone is a steroid hormone. Peptide hormones usually diffuse through the plasma membrane of the target cells and bind to intracellular receptors. The central nervous system is comprised of the brain and spinal cord.

Explanation / Answer

Answer:

71.

Option B - Back to the heart through the pulmonary veins

72.

Option D - All of the above(Peptide, Amine, Steroid)

74. TRUE

75. TRUE

76. TRUE

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