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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. Diaphragm B. 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 D. Simple columnar epithelium - secretion or absorption - D. Simple columnar epithelium - secretion or absorption The answer is simple columnar epithelium. Simple columnar epithelium specializes in secretion and absorption. It secretes mucus from it's goblet cells and absorbs with it's microvilli on the apical surface. Simple squamous epithelium is a cell that has a thin and flat surface. Simple squamous epithelium specializes in filtration or diffusion due to it's thin surface. Stratified squamous epithelium is squamous epithelium that are stacked upon each other many times. The function of this type of cell is to withstand abrasion with it's many layers and is the first line of defense against microbes. Transitional epithelium is a type of tissue that can stretch and maintain protective lining while capable of holding fluid without rupturing. You can mostly find these in urinary organs like the urinary bladder. A tissue examined under the microscope exhibits the following characteristics cells found on internal surface of stomach, no extracellular matrix, cells tall and thin, no blood vessels in the tissue. What type of tissue is this A. Epithelial B. Connective C. Muscle D. Cartilage E. Nervous - A. Epithelial

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