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vietquocnguyen vietquocnguyen
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6 years ago
The two threadlike proteins that slide to generate a muscle contraction are
 
  A) actin and myosin.
   B) myosin and acetylcholine.
   C) ATP and calcium.
   D) calcium and actin.
   E) acetylcholine and ATP.

Question 2

When pressure increases, flow:
 
  A) stays the same. B) varies. C) increases. D) decreases.

Question 3

The trachea begins at the level of the ________ cervical vertebra and ends at the level of the ________ thoracic vertebra.
 
  A) sixth, eighth B) sixth, sixth C) fourth, third D) sixth, fifth
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carelesslycoolcarelesslycool
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6 years ago
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vietquocnguyen Author
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6 years ago
This calls for a celebration Person Raising Both Hands in Celebration
cipcal
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ethom947
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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