HESI A&P Practice Questions with answers 100% verified graded A

What vein returns blood to the heart, draining the head, neck, and upper torso? - Superior Vena Cava In order for the actin filaments to bind to the myosin head, what must occur first? - Calcium ions must bind to troponin molecules What valve is responsible for preventing the back flow of blood from the right ventricle to the right atrium? - Tricuspid valve Which two bones make up the structure of the lower leg? - Fibula and Tibia The opening in the skull that is superior to the atlas is known as the _____________. - Foramen Magnum What section of the human spine contains five vertebrae? - Lumbar What lobe of the brain is responsible for processing olfactory information? - Temporal What type of cellular connection is characterized by openings in adjacent animal cells for intercellular exchange to take place? - Gap Junctions What is the main function of calcitonin? - Decreasing the calcium concentration in the blood What type of joint is present in the elbow? - Hinge joint A rupture in the cardiac sphincter would result in what occurring? - The back flow of gastric juices into the esophagus The engulfing of large particles into the cell is referred to as _____________. - Phagocytosis What enzyme begins the process of carbohydrate digestion in the mouth? - Amylase Fats are broken down in the small intestine using which enzymes? - Lipase and Bile Electrical impulses called "action potentials" move along the axon of a neuron by _________. - Saltatory conduction What area of the eye has the most acute vision and is comprised only of cones? - Fovea Centralis