You have been asked to teach the principles of CPR to a group of teens training to be lifeguards. You use a diagram of the thoracic cavity to help you explain how chest compressions can maintain circulation. Which view of the chest would best illustrate this point?
Answer: A sagittal view would clearly show that the heart is located between the sternum and the spine, allowing chest compressions to squeeze blood from the heart into the aorta.
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Nerve tracts other than the corticospinal tracts that transmit impulses into the spinal cord are called extrapyramidal tracts.
Answer the following statement true (T) or false (F)
The functional unit of muscle contraction is
A) the myosin cross-bridge. B) the muscle fiber. C) the muscle. D) the sarcomere.
A sarcomere is the
A. contractile thread that extends the length of the muscle fiber. B. plasma membrane of a muscle fiber. C. protein strand composed of actin or myosin. D. structural and functional unit of the skeletal muscle fiber. E. cytoplasm of a muscle fiber.
The P wave of an electrocardiogram indicates
A. atrial depolarization. B. threshold. C. atrial repolarization. D. ventricular depolarization. E. ventricular repolarization.