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 10TYU
Summary Introduction
To explain: What indicates an increase in heart rate if nerves to the heart are cut.
Introduction: Heart is a hollow and muscular organ which is located under the breastbone in the chest cavity. The main function of the heart is the pumping of blood to various organs of the body. The speed of the heart beats in a minute is referred to as heart rate. In a healthy individual, the normal range of heart rate is 72 beats per minute.
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5. Heart (pulse) rate: Listen to your heart with the stethoscope, and count the number of beats for 10 seconds. Convert (x6) to generate = _______ bpm. Likewise, measure your pulse rate at the carotid & radial arteries for 10 seconds.
At carotid artery:_______bpm.
At radial artery:_______ bpm
1)In the regulation of heart rate, which of the following is the proper stimulus?
Group of answer choices
-Change in mean arterial pressure
-mean arterial pressure
-change in heart rate
-heart rate
2) If a stimulus is a decrease in mean arterial pressure (MAP), what must be the response if using the baroreceptor reflex?
Group of answer choices
-Increase in heart rate
-Decrease in heart rate
-Increase in MAP
-Decrease in MAP
3)The brainstem acts as the integrating center for the baroreceptor and chemoreceptor reflexes.
Group of answer choices
True
False
4)A change in MAP causes a change in action potential firing along the afferent pathway of the baroreceptor reflex.
Group of answer choices
True
False
4.Why does the right ventricle need to pump the blood to the lungs via the left and right pulmonary arteries?
Read and analyze the question and choices CAREFULLY; more importantly, ALWAYS CHOOSE the BEST answer.
because the blood originating from the right ventricle will be transported immediately back to the heart via the left and right pulmonary veins
because the blood emerging from the right ventricle will be used to oxygenate the heart muscle itself
because the blood will be renewed into oxygenated blood
because the blood arising from the right ventricle needs to be pumped to all parts of the body
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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- Test Your Understanding 13. SCIENCE, TECHNOLOGY, AND SOCIETY Explain the association between atherosclerosis and ischemic heart disease. Imagine that you were the Surgeon General of the United States. What types of programs would you advocate to decrease heart disease? Do you think that as a society we should invest resources into the development of stem cell therapies for more effective treatment of myocardial infarction?arrow_forwardWhich of the following is unique to cardiac muscle cells? Only cardiac muscle contains a sarcoplasmic reticulum. Only cardiac muscle has gap junctions. Only cardiac muscle is capable of autorhythmicity Only cardiac muscle has a high concentration of mitochondria.arrow_forwardDescribe the electrical events that occur during the cardiac cyclein a mammalian heart.arrow_forward
- Which component of the heart conduction system would have the slowest rate of firing? atrioventricular node atrioventricular bundle bundle branches Purkinje fibersarrow_forwardKeeping the mammalian cardiac cycle balanced is/are: a. an AV node between the right atria atrium and right ventricle, which induces a wave of contraction. b. pacemaker cells, which compose the AV node and signal theSA node. c. an insulating layer that isolates the SA node from the rightatrium. d. ion channels in pacemaker cells, which close to depolarizetheir plasma membranes. e. neurogenic stimuli from the nervous system.arrow_forwardThe heart's internal pacemaker beats by: an internal implant that sends an electrical impulse through the heart the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node the action of the sinusarrow_forward
- 2. Based on where they must pump blood which side of the heart do you think must pump harder, right or left? Explain your answer , and use anatomical evidence from the heart to support your argument.arrow_forward2. Fill-in-the-blanks: Blood flow into the_________ (pulmonary circuit/systemic circuit) would __________(increaseldecrease) if the left side of the heart fails. Blood flow into the ________(pulmonary circuit/systemic circuit) would _________(increaseldecrease) if the right side of the heart fails.arrow_forward1 - Which chambers pump blood out of the heart? 2 - In which chamber does the nervous impulse for heart contraction begin?arrow_forward
- 6. Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE? A)The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+ B)Unlike skeletal muscle cells, the initial depolarization of ventricular cells is mainly due to Ca2+ influx, not Na+ influx C)Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells D)After sodium influx through voltage gated channels occurs in ventricular cells, prolong influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells. E)Like skeletal muscle cells, ventricular cardiac muscle cells have a resting potential primarily dependent on sodium.arrow_forward3. Your aortic arch and carotid artery walls have stretch receptors embedded in them, with change in stretch on the artery walls interpreted as changes in blood pressure. Choose one of those two arteries and tell why it is an ideal location for a blood pressure receptor? What is the name of these receptors?arrow_forwardDescribe why your heart rate increases with exercise. What would happen if your heart did not beat faster with exercise?arrow_forward
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