EBK HUMAN PHYSIOLOGY
8th Edition
ISBN: 9780134704227
Author: Silverthorn
Publisher: YUZU
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Chapter 25, Problem 20RQ
Summary Introduction
To determine: The cardiac output provided heart rate is
Introduction: Cardiac output is the volume of blood pumped by the heart per minute. It tells us the capacity of the atrium and ventricles. The normal cardiac output of an adult man is
Summary Introduction
To determine: The cardiac output if the heartbeat increases to
Introduction: The stroke volume is the amount of blood pumped by the left ventricle in one contraction. The stroke volume can be calculated by subtracting end systolic volume from end diastolic volume.
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Sue goes to the gym and after an initial warm-up, she increases her exercise level pushing herself to maximum. At this point her heart rate is 175 beats/min and her stroke volume is 135 ml/beat. What is her cardiac output now?
At this point, by how many ml/min has her CO increased over her resting CO?
What % increase over resting is this? (Use the following equation).
amount of increase in CO in ml/min
% increase = _____________ X 100%
original CO (resting) ml/min
What term is used to describe this increase in CO?
Lucy is resting before her workout. Her heart is beating times 70 times per minute, and with each heartbeat, her ventricles are pumping 65 mL of blood. Calculate Lucy’s Cardiac Output.
. Cardiac output In the late 1860s, Adolf Fick, a professor of
physiology in the Faculty of Medicine in Würzberg, Germany.
developed one of the methods we use today for measuring how
much blood your heart pumps in a minute. Your cardiac output as
you read this sentence is probably about 7L/min. At rest it is
likely to be a bit under 6 L/min. If you are a trained marathon
runner running a marathon, your cardiac output can be as high as
30 L/min.
Your cardiac output can be calculated with the formula
where Qis the number of milliliters of CO, you exhale in a minute
and D is the difference between the CO, concentration (ml/L)
in the blood pumped to the lungs and the CO, concentration in
the blood returning from the lungs. With Q - 233 ml/min and
D - 97 - 56 - 41 ml/L,
233 ml/min
5.68 L/min,
41 ml/L
fairly close to the 6 L/min that most people have at basal (resting)
conditions. (Data courtesy of J. Kenneth Herd, M.D., Quillan Col-
lege of Medicine, East Tennessee State University.)…
Chapter 25 Solutions
EBK HUMAN PHYSIOLOGY
Ch. 25.2 - If venous PO2 decreases as exercise intensity...Ch. 25.3 - In Figure 25.8b, why does the line for mean blood...Ch. 25.5 - The active vasodilator nerves to the skin secrete...Ch. 25 - Name the two muscle compounds that store energy in...Ch. 25 - Prob. 2RQCh. 25 - Prob. 3RQCh. 25 - Prob. 4RQCh. 25 - Prob. 5RQCh. 25 - What is meant by the term oxygen deficit, and how...Ch. 25 - Prob. 7RQ
Ch. 25 - In endurance events, body temperature can reach...Ch. 25 - Prob. 9RQCh. 25 - Prob. 10RQCh. 25 - Prob. 11RQCh. 25 - Prob. 12RQCh. 25 - Match the following brain areas with the...Ch. 25 - Specify whether each of the following parameters...Ch. 25 - Why doesnt increased venous return during exercise...Ch. 25 - Diagram the three theories that explain why the...Ch. 25 - Prob. 17RQCh. 25 - Explain how exercise decreases blood glucose in...Ch. 25 - Prob. 19RQCh. 25 - Prob. 20RQCh. 25 - The following graph shows left ventricular...
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Similar questions
- In conditioned athletes, the resting Heart Rate is generally much lower than in non-athletes. Why? a-because long-term exercise reduces Cardiac Output at rest to conserve energy b-because athletes have a smaller Stroke Volume at rest, causing Heart Rate to decrease as well c-because long-term exercise leads to increased vagal tone which slows Heart Rate d-because athletes have stronger ventricles and therefore a larger Stroke Volume at rest, so they require fewer bpm to achieve the same Cardiac Outputarrow_forwardWhich of the following statements best describes the differences in the regulation of cardiac and skeletal muscle contraction? The amount of contractile force actively generated by muscle cells is increased by stretch in skeletal muscle and decreased by stretch in cardiac muscle. Cardiac muscle is stimulated by motor neurons and skeletal muscle by neurones from the autonomic nervous system. Skeletal muscle contractile force is augmented by increasing the firing frequency of action potentials whereas cardiac muscle contractile force is enhanced by noradrenaline increasing calcium influx through ion channels. Ryanodine receptors in skeletal muscle are opened by a mechanism that requires calcium influx whereas in cardiac muscle membrane depolarisation alone without calcium influx is sufficient to open ryanodine receptors.arrow_forwardWhen Joe exercises, his cardiac output doubles. Before exercise, his heart rate is 60 beats/min. and his stroke volume is 80 ml/beat. During exercise, his heart rate is 105 beats/min. What is his stroke volume during exercise?arrow_forward
- Exercise-induced stress increases cardiac output and vasoconstriction, so why does the amplitude of the pulse change the way it does (compare this to what happens during the dive response)?arrow_forwardduring exercise cardiac output goes up from about 5 mL per liter to about 25 mL per liter. By volume where does most of this blood go? Skeletal muscles, the heart, or the skin.arrow_forwardWhat is the cardiac output of a person with a resting stroke volume of 60 mL and a heartbeat of 80 bpm. (BONUS: Is the calculated cardiac output normal or abnormal?)arrow_forward
- Why does your pulse rate increase after an exercise?arrow_forwardHeart rate during exercise at 75% maximal oxygen consumption is determined primarily by the parasympathetic nervous system the endocrine system the sympathetic nervous system neither parasympathetic nor sympatheticarrow_forwardAfter being rescued from the pool by the lifeguards, Marco now makes his way to the powerlifting competition, where he must deadlift (lift off the floor) 500kg. Consider how the following parameters would change during this bout of static exercise. Assume Marco can't actually lift the weight, but is trying really hard to do so. Cardiac output MAP AV conduction time [Choose ] [Choose ] [Choose ]arrow_forward
- Describe the effect of exercise on cardiac outputarrow_forwardExcess extracellular potassium functions to: (A) decrease the resting membrane potential of the ventricular contractile celle (B) decrease the force of contraction (C) initially increase the heart rate (D) A and B (E) all of the abovearrow_forwardBelow are drawings of three different action potentials. Two of these occur in the heart, and one occurs in skeletal muscle. Which one comes from a contractile cardiac muscle cell? A skeletal muscle cell? A cardiac pacemaker cell? For each one, state which ion is responsible for the depolarization phase and which ion is responsible for the repolarization phase.arrow_forward
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