Question: 4. If A Statement Is True, Write The Letter T In The Answer Blank. If A Statement Is False, Change The Underlined Word(s) And Write The Correct Word(s) In The Answer Blank. 1. Norepinephrine, Released By Parasympathetic Fibers, Stimulates The SA And AV Nodes And The Myocardium Itself. 2. The Resting Heart Is Said To Exhibit “vagal Tone,” Meaning That …

4. If a statement is true, write the letter T in the answer blank. If a statement is false, change the underlined word(s) and write the correct word(s) in the answer blank. 1. Norepinephrine, released by parasympathetic fibers, stimulates the SA and AV nodes and the myocardium itself. 2. The resting heart is said to exhibit “vagal tone,” meaning that the heart rate slows under the influence of acetylcholine, 3. Epinephrine secreted by the adrenal medulla decreases heart rate, 4. Low levels of ionic calcium cause prolonged cardiac contractions. 444 Study Guide for Human Anatomy & Physiology 5. The resting heart rate is fastest in adult life. 6. Because the heart of the highly trained athlete hypertrophies, its stroko volume decreases 7. In congestive heart failure, there is a marked rise in the end diastolic volume 8. If the right side of the heart fails, pulmonary congestion occurs. 9. In peripheral congestion, the feet, ankles, and fingers swell. 10. The pumping action of the healthy heart ordinarily maintains a balance between cardiac output and venous return. 11. The cardioacceleratory center in the medulla gives rise to sympathetic nerves supplying the heart