A doctor tells her nursing students that it is important to monitor patients' blood pressure when they are receiving drug A* (a medication that blocks calcium channels). Use your understanding of the role calcium plays in the heart to explain why drug A* might affect a patient’s blood pressure. The answer must include an explanation of the role of calcium in heart function, as well as the predicted effects of the drug A

What is the difference in the effects strenuous exercise has on your heart and the effects amphetamines has on your heart? And how can high blood pressure be hard on your heart but exercise is good?

Caffeine lowers the heart rate by increasing rates of depolarization at the SA node   True False   Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata   True False   The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length   True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm.   True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells.   True False

A patient was admitted to the hospital with chest pains. On admission, his pulse was 110 and blood pressure was 96/64. According to his history, his normal pulse rate is usually between 80 and 88 and his blood pressure runs from 120/70 to 130/80. 1. How is it possible for a patient to have an increased heart rate and a decreased blood pressure simultaneously?