HESI Anatomy and Physiology, Questions and accurate answers. 100% approved pass rate.

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What mineral is responsible for muscle contractoins? A. Chlorde B. Sodium C. Calcium D. Magnesium - D. Calcium The answer is calcium because in order for muscle contractions to occur, calcium ion... s are released from the sarcoplasmic reticulum which binds to the inhibitory protein, troponin, causing it to move away from the myosin binding spots on actin. Once the binding spots are open, the myosin head can attach to the ATP binding site and cause the muscle contraction cycle. In which of the following locations would the urinary bladder and internal reproductive organs be found? A. Thoracic Cavity B. Mediastinum C. Abdominal Cavity D. Pelvic Cavity - D. Pelvic Cavity The answer is pelvic cavity because this part of the body contains primarily reproductive organs: urinary bladder, pelvic colon, an [Show More]

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