The property that allows the heart to initiate each heartbeat itself is called __________________
Fill in the blank with correct word.
autorhythmicity
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When a chemical messenger has a short half-life, it means that
A. it will not have an extremely prolonged effect on target cells. B. it will not be eliminated quickly from the blood.
Answer the following statements true (T) or false (F)
1) "A lethal inherited disease in which mucus secretions become too sticky to be transported easily is emphysema." 2) " Method of applying abdominal pressure to dislodge objects from the respiratory passageways is called the Valsalva maneuver." 3) A tracheostomy is an incision in the anterior trachea. 4) Malignant division of cells in the bronchial tree or alveoli is lung cancer. 5) " A pulmonary embolism is a blood clot in the pulmonary blood vessels that traveled there from another origin."
Umbrella cells
a. are located in the kidney. b. are located in the bladder. c. are located in the urethra. d. are at the base of the internal urethral sphincter. e. none of these.
The P wave of the electrocardiogram is a signal from
A) depolarization of the SA node. B) depolarization of the AV node. C) depolarization of the atria. D) repolarization of the atria. E) depolarization of the ventricles.