SEELEY'S ANATOMY+PHYSIOLOGY
12th Edition
ISBN: 9781260172195
Author: VanPutte
Publisher: RENT MCG
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Chapter 20, Problem 7CT
A doctor lets you listen to a patient's heart with a stethoscope at the same time that you feel the patient's pulse. Once in a while, you hear two heartbeats very close together, but you feel only one pulse beat. Later, the doctor tells you that the patient exhibits a pulse deficit (the number of pulse beats felt is fewer than the number of heartbeats heard). Explain why a pulse deficit occurs.
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A doctor lets you listen to a patient's heart with a stethoscope at the same time that you feel the patient's pulse. Once in a while, you hear two heartbeats very close together, but you feel only one pulse beat Later, the doctor tells you that the patient has an ectopic focus in the right atrium. Explain why you hear two heartbeats very close together. The doctor also tells you that the patient exhibits a pulse deficit. Explain why a pulse deficit occurs.
A doctor lets you listen to a patient's heart with a stethoscope at the same time that you feel the patient's pulse. Once in a while, you hear two heartbeats very close together, but you feel only one pulse beat. Later, the doctor also tells you that the patient exhibits a pulse deficit. Explain why a pulse deficit occurs.
SA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic firing rate of the SA node?
A. sympathetic inputs from the hypothalamus are slowing it down
B. parasympathetic inputs from medulla oblongata are slowing it down
C. there is inertia in heart muscle as it takes time for impulse to spread through all the cells
D. centrifugal inputs from the AV node are slowing it down
Chapter 20 Solutions
SEELEY'S ANATOMY+PHYSIOLOGY
Ch. 20.1 - State the four functions of the heart.Ch. 20.2 - What is the approximate size and shape of the...Ch. 20.2 - Where is the heart located? How does this...Ch. 20.3 - Describe the parts of the pericardium and their...Ch. 20.3 - Describe the three layers of the heart wall, and...Ch. 20.3 - Name the chambers of the heart, and describe their...Ch. 20.3 - List the major blood vessels that enter and leave...Ch. 20.3 - Prob. 8AYPCh. 20.3 - Prob. 9AYPCh. 20.3 - Prob. 10AYP
Ch. 20.3 - Describe the openings of the right and left atria....Ch. 20.3 - Prob. 12AYPCh. 20.3 - Prob. 13AYPCh. 20.3 - Prob. 14AYPCh. 20.4 - Prob. 15AYPCh. 20.5 - Prob. 16AYPCh. 20.5 - Prob. 17AYPCh. 20.5 - Prob. 18AYPCh. 20.5 - Prob. 19AYPCh. 20.5 - Identify the parts of the conducting system of...Ch. 20.5 - Prob. 21AYPCh. 20.5 - Prob. 22AYPCh. 20.6 - Prob. 23AYPCh. 20.6 - Prob. 24AYPCh. 20.6 - Prob. 25AYPCh. 20.6 - Prob. 26AYPCh. 20.6 - What does an ECG measure? Nome the waves...Ch. 20.7 - Define systole and diastole.Ch. 20.7 - List the five periods of the cardiac cycle (see...Ch. 20.7 - Define isovolumetric. When does most ventricular...Ch. 20.7 - Prob. 31AYPCh. 20.7 - Prob. 32AYPCh. 20.7 - Prob. 33AYPCh. 20.8 - Prob. 34AYPCh. 20.8 - Explain the role of MAP in causing blood flow.Ch. 20.8 - Prob. 36AYPCh. 20.8 - Prob. 37AYPCh. 20.8 - Prob. 38AYPCh. 20.9 - Prob. 39AYPCh. 20.9 - Prob. 40AYPCh. 20.9 - Prob. 41AYPCh. 20.9 - Prob. 42AYPCh. 20.9 - Prob. 43AYPCh. 20.10 - Prob. 44AYPCh. 20.10 - Prob. 45AYPCh. 20.10 - What effect does an increase or a decrease...Ch. 20.10 - Prob. 47AYPCh. 20.11 - Prob. 48AYPCh. 20.11 - Prob. 49AYPCh. 20.11 - Prob. 50AYPCh. 20.11 - Prob. 51AYPCh. 20 - Which of these structures returns blood to the...Ch. 20 - Prob. 2RACCh. 20 - Prob. 3RACCh. 20 - Prob. 4RACCh. 20 - Prob. 5RACCh. 20 - Prob. 6RACCh. 20 - Action potentials pass from one cardiac muscle...Ch. 20 - During the transmission of action potentials...Ch. 20 - Given these structures of the conducting system of...Ch. 20 - Prob. 10RACCh. 20 - Prob. 11RACCh. 20 - The greatest amount of ventricular filling occurs...Ch. 20 - Prob. 13RACCh. 20 - Prob. 14RACCh. 20 - Prob. 15RACCh. 20 - Cardiac output is defined as blood pressure times...Ch. 20 - Pressure in the aorta is at its lowest a. at the...Ch. 20 - Prob. 18RACCh. 20 - Prob. 19RACCh. 20 - Prob. 20RACCh. 20 - Prob. 21RACCh. 20 - Increased parasympathetic stimulation of the heart...Ch. 20 - Prob. 23RACCh. 20 - Prob. 24RACCh. 20 - Prob. 25RACCh. 20 - Prob. 1CTCh. 20 - In most tissues, peak blood flow occurs during...Ch. 20 - Prob. 3CTCh. 20 - Prob. 4CTCh. 20 - A patient has tachycardia. Would you recommended a...Ch. 20 - Prob. 6CTCh. 20 - A doctor lets you listen to a patient's heart with...Ch. 20 - Explain why it is sufficient to replace the...Ch. 20 - Prob. 9CTCh. 20 - Prob. 10CTCh. 20 - Prob. 11CT
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- The contraction phase of the heartbeat is ______; the relaxation phase is _______.arrow_forwardA doctor lets you listen to a patient's heart with a stethoscope at the same time that you feel the patient's pulse. Once in a while you hear two heartbeats very close together, but you feel only one pulse beat Later,the doctor tells you that the patient has an ectopic focus in the right atrium. Explain why you hear two heartbeats very close together. The doctor also tells you that the patient exhibits a pulse deficit (the number of pulse beats felt in a fewer than the number of heartbeats heard). Explain why a pulse deficit occurs.arrow_forwardA doctor lets you listen to a patient's heart with a stethoscope at the same time that you feel the patient's pulse. Once in a while you hear two heartbeats very close together, but you feel only one pulse beat Later, the doctor tells you that the patient has an ectopic focus in the right atrium. Explain why you hear two heartbeats very close together. The doctor also tells you that the patient exhibits a pulse deficit (the number of pulse beats felt in a fewer than the number of heartbeats heard).Explain why a pulse deficit occurs. After answering, has anyone you know experienced this phenomenon?arrow_forward
- One treatment for heart problems is “bypass surgery.” What is this and why is it done?arrow_forwardRead 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?arrow_forwardThe heartbeat is regulated by the cardiac conduction system and includes five different components. Each of these components has a specified function in the production of the heartbeat. Select two of these components and explain their job and their location. Then select one and describe a disorder that is the result of a malfunction in that particular part of the system.arrow_forward
- If you were running late for lab and had to run to get there on time, the sympathetic neurons of your autonomic nervous system were likely activated and releasing norepinephrine; what immediate effect might this have had on the blood pressure measured in your brachial artery? Increased stroke volume and heart rate to decrease blood pressure Increased stroke volume and heart rate to increase blood pressure Decreased stroke volume and heart rate to decrease blood pressure Decreased stroke volume and heart rate to increase blood pressure DERMA personarrow_forwardWhy is your heart rate high after running a short distance, but not as elevated after running a much longer distance? How do you explain this?arrow_forwardWhat happens to the pulse rate when activities demand more body movements? Explain. Give 2 systems that are directly affected whenever pulse rate increases? Why?arrow_forward
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