EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 34.2, Problem 3CC
Summary Introduction
To determine:
What changes occur after doing regular exercise for several months. The resting heart rate decreases but cardiac output is remains unchanged.
Introduction:
Heart is muscular tissue made up of cardiac muscle. It helps in transportation of oxygen in body through blood and also carries deoxygenated blood from the body and transports it to the lungs. This involves the contraction and relaxation of heart. When heart contracts it pumps oxygenated blood into the body and when it is relaxed its chamber is filled with blood. This process is called cardiac cycle. In this, contraction phase is called systole and relaxation phase is called diastole.
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WHAT IF? If your doctor gave you a copy of your ECG recording, how could you determine what your heartrate had been during the test?
Restate your predictions that were not correct and correct them, give supporting data from your experiment that supports your corrections.
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 Output
Chapter 34 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 34.1 - How is the now of hemolymph through an open...Ch. 34.1 - Three-chambered hearts with incomplete septa were...Ch. 34.1 - Prob. 3CCCh. 34.2 - Prob. 1CCCh. 34.2 - Why is it important that the AV node delay the...Ch. 34.2 - Prob. 3CCCh. 34.3 - What is the primary cause of the low velocity of...Ch. 34.3 - Prob. 2CCCh. 34.3 - Prob. 3CCCh. 34.4 - Prob. 1CC
Ch. 34.4 - Prob. 2CCCh. 34.4 - Prob. 3CCCh. 34.4 - Prob. 4CCCh. 34.5 - Why is an internal location for gas exchange...Ch. 34.5 - After a heavy rain, earthworms come to the...Ch. 34.5 - MAKE CONNECTIONS Describe similarities in the...Ch. 34.6 - Prob. 1CCCh. 34.6 - Prob. 2CCCh. 34.6 - WHAT IF? If an injury tore a small hole in the...Ch. 34.7 - What determines whether O2, or CO2, undergoes net...Ch. 34.7 - How does the Bohr shift help deliver O2, to very...Ch. 34.7 - Prob. 3CCCh. 34 - Which of the following respiratory systems is not...Ch. 34 - Blood returning to the mammalian heart in a...Ch. 34 - Pulse is a direct measure of A. blood pressure. B....Ch. 34 - Prob. 4TYUCh. 34 - One feature that amphibians and humans have in...Ch. 34 - If a molecule of CO2 released into the blood in...Ch. 34 - Prob. 7TYUCh. 34 - DRAW IT Plot blood pressure against time for one...Ch. 34 - Prob. 9TYUCh. 34 - Prob. 10TYUCh. 34 - Prob. 11TYUCh. 34 - SYNTHESIZE YOUR KNOWLEDGE The diving bell spider...
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- ERCISE 36 Electrical Activity of the Heart Use this grid to graph the heart rates observed after exercise. Be sure to label your graph completely and accurately. bon Put in Order (rearrange these heart structures in the order through which electrical signals are conducted in a single cardiac cycle) Put in Order 1. atrial myocardium AV bundle branches nim 2. AV bundle AV node subendocardial (Purkinje) fibers SA node 3. 4. 5. ventricular myocardium 6. Fill-in (complete each statement with the correct term) 7. 1. Relaxation of a heart chamber is called _?_. 2. Contraction of a heart chamber is called _?_. 3. The portion of the ECG that represents ventricular repolarization is the _?. 4. Leads I, II, and III together are called the _?_ leads, or appendicular leads. 5. ? is the condition of elevated heart rate. Fill-in 1. 2. 3. 4. 5. a 0010 bu Floouior Inc All rights reserved.arrow_forward#8arrow_forwardWhy would your heart rate increase or decrease to help maintain homeostasis when you exercise?arrow_forward
- . 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.)…arrow_forward4arrow_forwardBased on the results shown in Figures 2A and 2B, was there a significant change in TP interval in either group? Explain your results using your knowledge of the cardiac cycle and of how the heart is regulated by electrical activity.arrow_forward
- Pls helparrow_forwarddown DATA ANALYSIS 1. Typical resting heart rates range from 55-100 beats per minute. What was the subject's resting heart rate? How much did the subject's heart rate increase above resting rate with exercise? What percent increase was this? Explain. alt 2. How does the subject's maximum heart rate compare with other students in the group or class? Is this what you expected? Explain. Explain- 3. Recovery time has been shown to correlate with degree of physical fitness. How does the subject's recovery rate compare to that of your classmates? Is this what you expected? page 94 4. Congestive heart failure is a condition in which the strength of contraction with each beat may be significantly reduced. For example, the ventricle may pump only half the usual volume of blood with each beat. Would you expect a person with congestive heart failure to have a faster or slower heart rate at rest? With exercise? 5. Certain medications are prescribed by medical professionals to slow a patient's…arrow_forwardHelp ?arrow_forward
- 2. During standard physical activity - 20 squats in 30 seconds. heart rate increases due to the action of the limbic zone of the cortex through the reticulospinal pathway on the primary centers of the sympathetic nervous system. Answer: A. Name the department of the central nervous system where the primary centers of the sympathetic nervous system are located; B. Draw a diagram of the information transmission path from the primary centers of the sympathetic nervous system to the pacemaker of the heart with the participation of sympathetic nerves; C. Name the mediators and cytoreceptors in the ganglionic and nerve-organ synapses of this pathway; show the location of ganglionic and nerve-organ synapses on the diagram with arrows. D. The action of which blocking substance can prevent the appearance of such a reaction? (Explain the answer).arrow_forwardChapter 15: Lab Assignment: Heart Rate and Aerobic Prescription (2 pages) 1. Resting Heart Rate (RHR): record your resting heart rate by taking your pulse for 10 seconds and multiplying the number by 6. What is a normal resting heart rate_ ×6= (RHR). , and how does yours compare? 2. Maximum Heart Rate (MHR)-what is a Maximum Heart Rate? Calculate your maximum heart rate by subtracting your age in years from 220. 220- (age) = (MHR) 3. Calculating a Heart Rate Range: Using the Karvonen formula, calculate a range of 70% to 75% of your maximum heart rate. Target Heart Rate = [(max HR - resting HR) x %Intensity] + resting HR example (Max HR) - (Max HR)- (RHR) x 0.70+ (RHR) x 0.75 + (RHR) = (RHR) = Why should we figure out our Target Heart Rate? What is the benefit of using the Karvonen formula? 4. Utilize the Fartlek Aerobic Training/Speed Play Method for 10 minutes. 1 minute (run/jog/speed walk)-1 minute (jog, walk). Take your heart rate immediately upon completion for 1 minute.. Are you…arrow_forwardQ4.3. Under normal physiological conditions, the pressure-volume relationship for the heart is described in Figure 4.3. Explaining your reasoning, approximate the work associated with the left ventricle under these conditions. 150 125 Phase 3 100 - 75 50 - Phase 4 Work Phase 2 25 Phase 1 25 50 75 100 125 150 Left ventricular volume (mL)arrow_forward
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