Anatomy & Physiology: An Integrative Approach
2nd Edition
ISBN: 9780078024283
Author: Michael McKinley Dr., Valerie O'Loughlin, Theresa Bidle
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 19, Problem 3CSL
Your grandfather was told that his SA node (pacemaker) has stopped functioning. Explain how his heart is still beating at a rate of 40 to 50 times per minute. Are the atria stimulated to contract? Explain.
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Your grandfather was told that his SA node (pacemaker) has stopped functioning. Explain how his heart is still beating at a rate of 40 to 50 times per minute. Are the atria stimulated to contract? Explain.
1) If a heart lacked gap junctions, an organ-level contraction would occur.True/False
2) We care about mean arterial pressure specifically because we care about having an appropriate rate of blood flow through capillaries. True/False
3) A person's L-type channels are mutated so that they do not inactivate. How would this affect the time duration of a cardiac action potential?
Group of answer choices
a)Increase
b)No change
c)Decrease
4) A person's L-type channels are mutated so that they do not inactivate. How would this affect the time duration of a cardiac muscle cell contraction?
Group of answer choices
a)Increase
b)No change
c)Decrease
John is your 68-year old neighbor who was recently told by his doctor that his heart’s main pacemaker stopped working (“They told me it is called an SA node”). He knows you are a nurse, so he came to you to ask why his heart is still beating, but only at a rate of 50 times per minute. Please explain using appropriate physiological and anatomical details.
Chapter 19 Solutions
Anatomy & Physiology: An Integrative Approach
Ch. 19.1 - What are the potential consequences of a failing...Ch. 19.1 - Prob. 2WDYLCh. 19.1 - What path does blood follow through the heart?...Ch. 19.1 - Which of the great vessels is both an artery and...Ch. 19.2 - Prob. 5WDYLCh. 19.2 - Describe the three layers that cover the heart....Ch. 19.3 - Prob. 7WDYLCh. 19.3 - What are the layers of the heart (in order) that a...Ch. 19.3 - What is the structure that separates the two...Ch. 19.3 - What are the functions of the tendinous cords and...
Ch. 19.3 - Which features of cardiac muscle support aerobic...Ch. 19.3 - Which function of the fibrous skeleton allows the...Ch. 19.4 - What areas of the heart are deprived of blood when...Ch. 19.4 - Prob. 14WDYLCh. 19.5 - Prob. 15WDYLCh. 19.5 - Which autonomic division is associated with the...Ch. 19.6 - Prob. 17WDYLCh. 19.6 - What is autorhythmicity? Describe how nodal cells...Ch. 19.6 - What is the path of an action potential through...Ch. 19.6 - What anatomic features slow the conduction rate of...Ch. 19.7 - In which direction does Ca2+ move in response to...Ch. 19.7 - What three electrical events occur at the...Ch. 19.7 - What is the significance of the extended...Ch. 19.7 - What events in the heart are indicated by each of...Ch. 19.8 - Pressure changes that occur during the cardiac...Ch. 19.8 - What is occurring during ventricular ejection?Ch. 19.8 - Prob. 27WDYLCh. 19.8 - Define end-diastolic volume, end-systolic volume,...Ch. 19.9 - What are the two factors that determine cardiac...Ch. 19.9 - What is the cardiac output at rest and during...Ch. 19.9 - Prob. 31WDYLCh. 19.9 - Describe the atrial reflex, which involves...Ch. 19.9 - Prob. 33WDYLCh. 19.9 - Prob. 34WDYLCh. 19.10 - What would be the path of blood flow through the...Ch. 19 - Which of the following is the correct circulatory...Ch. 19 - The pericardial cavity is located between the a....Ch. 19 - How is blood prevented from backflowing from the...Ch. 19 - ____ 4. Venous blood draining from the heart wall...Ch. 19 - _____ 5. Calcium channels in the nodal cells...Ch. 19 - ____6. Action potentials are spread rapidly...Ch. 19 - Why is it necessary to stimulate papillary muscles...Ch. 19 - ____ 8. Preload is a measure of a. stretch of...Ch. 19 - ____ 9. All of the following occur when the...Ch. 19 - ____10. What occurs during the atrial reflex? a....Ch. 19 - Prob. 11DYKBCh. 19 - Compare the structure, location, and function of...Ch. 19 - Prob. 13DYKBCh. 19 - Explain why the walls of the atria are thinner...Ch. 19 - Describe the structure and function of...Ch. 19 - Explain the general location and function of...Ch. 19 - Describe the functional differences in the effects...Ch. 19 - Prob. 18DYKBCh. 19 - List the five events of the cardiac cycle, and...Ch. 19 - Define cardiac output, and explain how it is...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - Prob. 3CALCh. 19 - Prob. 4CALCh. 19 - During surgery, the right vagus nerve was...Ch. 19 - Prob. 1CSLCh. 19 - Prob. 2CSLCh. 19 - Your grandfather was told that his SA node...
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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
- Your grandfather was told that his SA node (pacemaker) had stopped functioning. Explain how his heart is still beating at a rate of 40-50 times per minute. Are the atria still being stimulated to contract, and what area of the heart is stimulating them?arrow_forward1)An increase in total peripheral resistance, all else remaining the same, will cause an increase in mean arterial pressure.True/False 2) We care about mean arterial pressure specifically because we care about having an appropriate rate of blood flow through capillaries. True/False 3) A person's L-type channels are mutated so that they do not inactivate. How would this affect the time duration of a cardiac action potential? Group of answer choices a)Increase b)No change c)Decrease 4) A person' L-type channels are mutated so that they do not inactivate. How would this affect the time duration of a cardiac muscle cell contraction? Group of answer choices a)Increase b)No change c)Decreasearrow_forwardConsidering the function of the heart, why is it important that the myocardium cannot be tetanized?arrow_forward
- Although not considered the primary pacemaker of the heart, the atrioventricular node can indeed be considered as playing SOME role in setting the rhythm of the heart (kind of a secondary pacemaker). Explain how/why.arrow_forward1) A drug was applied to a person that blocked the pore/channel in the L-type calcium channel in cardiac muscle cells. The drug had no other effects. True/false: Cross-bridge cycling and tension production would occur normally in drug-treated fibers. 2) The plateau phase of a cardiac action potential is an absolute refractory period.True/false 3) If a heart lacked gap junctions, an organ-level contraction would occur.True/false 4) During a pacemaker potential, what is caused in neighboring muscle fibers when threshold potential is reached. Group of answer choices a)cross-bridge cycling b)Receptor potential c)An action potential d)A graded potentialarrow_forwardThe rapid depolarization phase of heart pacemaker cells is caused by which of the following? movement of Na+ through funny channels movement of Ca++ through L-type channels movement of Na+ and Ca++ through funny channels movement of K+ through funny channels all of the abovearrow_forward
- Roberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers. Briefly describe how beta-blockers will influence Roberto’s heart function, specifically the physiology of the ventricles.arrow_forwardRoberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers.Briefly describe how beta-blockers will influence Roberto’s heart function, specifically the physiology of the ventricles.arrow_forwardWhy do we need to prevent the decompensated state in patients with heart failure?arrow_forward
- Describe the events leading up to contraction in a cardiac contractile cell. (Where does the stimulus to “contract” come from?)arrow_forwardWhen the SA node doesn’t function properly, the AV node takes over pacing the heart and produces what is known as a junctional rhythm. Explain why we don’t see P waves on the ECG of an individual with such a rhythm?arrow_forwardYou wanted to prepare a fish dish for your grandfather that he loves the dried salted Codfish. But you noticed that this might be causing a problem for your elder grandfather since he has hypertension, what would you do to remove the salt from the fish? (Answer with one word) What is the mechanism by which the salt gets out from the fish? (one word) Please put a comma and space between * the two answers word. Answer:arrow_forward
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