What best describes the Frank-Starling law? O The Frank-Starling law states that the greater the volume of blood discharged from the hea O The Frank-Starling law states that the slower the heart rate, the greater the cardiac output. O The Frank-Starling law states that the greater the stroke volume, the greater the heart rate. The Fronk Starling lay states that the more the ventricular muscle cells are stretched, the m

What best describes the Frank-Starling law? O The Frank-Starling law states that the greater the volume of blood discharged from the hea O The Frank-Starling law states that the slower the heart rate, the greater the cardiac output. O The Frank-Starling law states that the greater the stroke volume, the greater the heart rate. The Fronk Starling lay states that the more the ventricular muscle cells are stretched, the m

Name: 27 What best describes the Frank-Starling law?O The Frank-Starling law
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Description: 27 What best describes the Frank-Starling law?O The Frank-Starling law states that the greater the volume of blood discharged from the heart, the greater the pressure required to discharge the blood.O The Frank-Starling law states that the slower the

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter44: The Circulatory System

Section: Chapter Questions

Problem 7TYK

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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
What is the correct order of events in the left ventricle during the systole phase of the cardiac cycle? a. Ventricular repolarization, ventricular relaxation, 2nd heart sound, AV valve opens, blood moves in b. QRS-complex, ventricular contraction, 2nd heart sound, aortic valve opens, blood moves out c. P-wave, increased ventricular pressure, 1st heart sound, aortic valve opens, blood moves in d. QRS complex, ventricular contraction, 1st heart sound, AV valve opens, blood moves out e. QRS complex, increased ventricular pressure, AV-valve closes, blood moves out
What is the primary reason for why pulse pressure increases with aging? a. Decrease in the number of capillaries b. Aortic compliance decreases c. Speed of blood ejection from the aorta decreases d. Stroke volume decreases e. Heart rate decreases
Which of the following statements best describes the actions of the neurotransmitter noradrenaline in the heart? Noradrenaline acts on α1-adrenoceptors in the sinoatrial node to increase heart rate. Noradrenaline decreases the rate and force of contraction of the heart. Noradrenaline increases the rate, but not the force of contraction of the heart. Noradrenaline acts on β1-adrenoceptors in the sinoatrial node to increase heart rate.
Diagram electrical conduction of the heart and discuss each component (SA node, AV node, etc). How does this dictate the fluidity of heart contraction? Why does the SA always start the conduction? What is the inherent rate of depolarization of the SA node (this means that if the nervous system was shut off what would resting bpm be)? If it is damaged what happens to the electrical conduction system?
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
What is the cardiac output of a heart when the heartbeat rate is 60 beat.min-1, the diastolic pressure in the aorta is 80 mm Hg, and the stroke volume is 80 mL.beat-1? A. 4,800 mm Hg.min-1 B. 6,400 mL.mm Hg-1 C. 4,800 mL.min-1 D. 1.33 mL.beat-1 E. 0.75 mL.min-1
1. What happens when the pressure in the ventricles becomes lower than the pressure in the atria? A.the semilunar valves open B.the semilunar valves close C.the atrioventricular valves open D.the first heart sound occurs 2. Pressure is changed by changing ___ which the ventricles control through contraction and relaxation. A.temperature B.flow C.resistance D.volume E.charge 3. If the pressure in the ventricles is higher than the pressure in the atria, but lower than the pressure in the great arteries, which of the following is true? A.semilunar valves will be closed, but the atrioventricular valves will be open, ventricles will be filling B.both the atrioventricular and semilunar valves will be open and there will be flow through the ventricles C.the atrioventricular valves will be closed, but the semilunar valves will be open, ventricles will be ejecting blood C.both the atrioventricular and semilunar valves will be closed…
If cardiac output is 16L/min during jogging, and 25% of total blood flow is being diverted to skeletal muscle, how much blood is being delivered to skeletal muscle in L/min? a. 2 b. 5 c. 6 d. 1 e. 4 f. 3
All of the following are correct about the isovolumetric contraction, except ____________. A. This phase of the cardiac cycle begins with the appearance of the QRS complex of the ECG, which represents atrial repolarization and ventricular depolarization B. It represents the time period between the closure of the AV valves and the opening of the aortic and pulmonic valves, ventricular pressure rises rapidly without a change in ventricular volume C. The rate of pressure increase in the ventricles is determined by the rate of contraction of the muscle fibers, which is determine by mechanisms governing excitation-contraction coupling D. Ventricular chamber geometry changes considerably as the heart becomes more spheroid in shape; circumference increases and atrial base-to-apex length increases
Explain briefly what happens to your heart rate before and after performing an exercise? Why does your heart rate change before and after performing an exercise?
In a healthy heart, which of the following statements is TRUE?A) Depolarization of the interventricular septum occurs from right to left.B)The right ventricle depolarizes before the left ventricle.C) The wave of depolarization passes more quickly through the AV node than the Purkinje fibers.D) The QRS complex is predominantly upright in Leads I and II. E) The mean electrical axis is generally between +100 and +150 degrees.