Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 44, Problem 6TYU
Summary Introduction
Introduction: Nervous system is controlling the actions of the body. Neurotransmitters are the chemicals released in the nervous system that pass information in the form of signals from one neuron to other and ultimately to the brain. Norepinephrine is a neurotransmitter.
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Which of the following would NOT result from an increase in sympathetic stimulation of the heart?
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increased force of ventricular contraction
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Chapter 44 Solutions
Biology (MindTap Course List)
Ch. 44.1 - Types of Circulatory Systems Contrast internal...Ch. 44.1 - Compare how oxygen is transported to the body...Ch. 44.1 - Prob. 2CCh. 44.1 - What are five functions of the vertebrate...Ch. 44.2 - Prob. 2LOCh. 44.2 - Summarize the sequence of events involved in blood...Ch. 44.2 - Prob. 1CCh. 44.2 - Prob. 2CCh. 44.2 - Prob. 3CCh. 44.3 - Prob. 4LO
Ch. 44.3 - Prob. 1CCh. 44.3 - Prob. 2CCh. 44.4 - Prob. 5LOCh. 44.4 - Prob. 1CCh. 44.5 - Prob. 6LOCh. 44.5 - Prob. 7LOCh. 44.5 - Prob. 8LOCh. 44.5 - Prob. 1CCh. 44.5 - PREDICT A patients mitral valve (left AV valve)...Ch. 44.5 - Prob. 3CCh. 44.6 - Prob. 9LOCh. 44.6 - Prob. 1CCh. 44.6 - Prob. 2CCh. 44.7 - Prob. 10LOCh. 44.7 - Prob. 1CCh. 44.7 - Prob. 2CCh. 44.8 - Prob. 11LOCh. 44.8 - Prob. 1CCh. 44.8 - Prob. 2CCh. 44.9 - Trace the progression of atherosclerosis and...Ch. 44.9 - Prob. 1CCh. 44.9 - Prob. 2CCh. 44 - Which of the following are most closely associated...Ch. 44 - Prob. 2TYUCh. 44 - Prob. 3TYUCh. 44 - Prob. 4TYUCh. 44 - Prob. 5TYUCh. 44 - Prob. 6TYUCh. 44 - Prob. 7TYUCh. 44 - Prob. 8TYUCh. 44 - Test Your Understanding 9. VISUALIZE Draw a simple...Ch. 44 - Prob. 10TYUCh. 44 - Prob. 11TYUCh. 44 - Prob. 12TYUCh. 44 - Test Your Understanding 13. SCIENCE, TECHNOLOGY,...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
A rhythmic beating of cardiac muscle in a mammalian heart is initiated by the _____.
A.Atrioventricular node
B.Parasympathetic nervous system
C.Purkinje fibers
D.Sinoatrial node
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During the refractory period a second action potential______.
A
cannot occur because voltage-gated Na+ channels are inactivated
B
cannot occur because the heart muscle cell has already returned to resting potential
C
can be initiated more easily because the threshold potential is reduced
D
can be initiated more easily because the calcium level in the sarcoplasm is increased
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Action potentials are spread rapidly between cardiac muscle cells by a. sarcomeres.
b. intercalated discs.
c. chemical neurotransmitters.
d. the fibrous skeleton.
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Fill in the blank:
Parasympathetic nerve fibers that supply the heart make up part of the _______________________ nerve.
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How would you explain the flow of electrical activity through the heart to a 5-year-old?
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We analyzed the difference between the action potential of a cardiac contractile cell and an action potential in a neuron. Describe the physiological mechanisms behind the primary difference in the shape of these two action potentials. Why is this feature important to the normal workings of the heart?
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What happens when the pressure in the ventricles becomes lower than the pressure in the atria?
a-the atrioventricular valves open
b-the semilunar valves close
c-the semilunar valves open
d-the first heart sound occurs
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Epinephrine is the chief neurotransmitter of the sympathetic nervous system. What effect would you expect it to have on the contractions of cardiac muscle? Explain.
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How would the left ventricle of a patient who had had high blood pressure for many years differ from the left ventricle of a normal heart?
A
it would have a larger volume of muscle
B
it would have a smaller volume of muscle
C
it would be smaller than the right ventricle
D
chronic high blood pressure would weaken the heart valves but would have no anatomical effects on the walls of the ventricles
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Read this article (http://openstaxcollege.org/l/strokespell) to learn about a teenager who experiences a series of spells that suggest a stroke. He undergoes endless tests and seeks input from multiple doctors. In the end, one expert, one question, and a simple blood pressure cuff answers the question. Why would the heart have to beat faster when the teenager changes his body position from lying down to sitting, and then to standing?
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The muscle cells of a heart chamber work as a functional syncytium. In terms of heart function this means...
A) All the cardiac muscle cells are controlled by one motor neuron, resulting in coordinated contraction.
B) All the cardiac muscle cells are electrically connected by gap junctions, resulting in coordinated contraction.
C) All the cardiac muscle cells are stimulated to contract by hormone release, resulting in near-coordinated contraction.
D) All the cardiac muscle cells contract independently of each other (fibrillation).
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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?
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