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

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 ions 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, and rectum. Thoracic cavity contains the cardiovascular system, respiratory system, and digestive system. The mediastinum contains all the chest organs except the lungs. What separates the thoracic cavity from the abdominal cavity? A. DiaphragmB. Mediastinum C. Liver D. Lungs - A. Diaphragm The diaphgram is the muscle that separates the thoracic cavity and the abdominal cavity. This also assists in respiration. Which of the following epithelial types is correctly matched with its major function? A. Simple squamous epithelium - secretion or absorption B. Stratified squamous epithelium - changes shape when stretched C. Stratified squamous epithelium - diffusion