Cardiovascular Physiology Ex 6 Act. 1, 2, 3, 4 and 5 PDF

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3/2/2021

Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5 Due: 11:59pm on Tuesday, March 2, 2021 You will receive no credit for items you complete after the assignment is due. Grading Policy

PhysioEx Exercise 6 > Activity 1: Overview and Pre-lab Quiz for Investigating the Refractory Period of Cardiac Muscle Read the introduction and then answer the Pre-lab Quiz questions to the right. Exercise 6 > Activity 1: Investigating the Refractory Period of Cardiac Muscle

Part A The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______. ANSWER: potassium sodium calcium magnesium

Correct

Part B The repolarization of cardiac muscle is due to _______. ANSWER:

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

sodium exiting the cell sodium entering the cell potassium exiting the cell potassium entering the cell

Correct

Part C The total refractory period of cardiac muscle _______. ANSWER:

is longer than the total refractory period for skeletal muscle is longer than the contraction of cardiac muscle is shorter than the total refractory period for skeletal muscle is about the same as the total refractory period for skeletal muscle

Correct

Part D Skeletal muscle is capable of which of the following? ANSWER: fused tetanus wave summation, fused tetanus and autorhythmicity wave summation and fused tetanus autorhythmicity wave summation

Correct

PhysioEx Exercise 6 > Activity 1: Activity and Post-lab Quiz for Investigating the Refractory Period of Cardiac Muscle

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Click on the link or the image below to launch Exercise 6 > Activity 1: Investigating the Refractory Period of Cardiac Muscle. Complete the Experiment and then answer the Post-lab Quiz questions to the right. Exercise 6 > Activity 1: Investigating the Refractory Period of Cardiac Muscle

Part A Delivering single shocks in succession to stimulate the frog heart _______. ANSWER:

did not increase the height of the ventricular systole wave resulted in wave summation resulted in fused tetanus increased the height of the ventricular systole wave

Correct

Part B The doublet that results with more frequent stimulation of the frog heart represents _______. ANSWER:

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

an extrasystole and an extra contraction of the ventricles an extrasystole and an extra contraction of the atria an extra contraction of the ventricles an extra contraction of the atria an extrasystole

Correct

Part C When the ventricles beat rapidly in succession, _______. ANSWER:

wave summation occurred a compensatory pause followed a doublet representing two atrial contractions followed the second peak was higher than the first

Correct

Part D When multiple stimuli were applied at 20 stimuli/sec, _______. ANSWER:

atrial contractions completely disappeared extrasystoles were produced fused tetanus occurred triplets representing three ventricular contractions occurred

Correct

PhysioEx Exercise 6 > Activity 2: Overview and Pre-lab Quiz for Examining the Effect of Vagus Nerve Stimulation Read the introduction and then answer the Pre-lab Quiz questions to the right. https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Exercise 6 > Activity 2: Examining the Effect of Vagus Nerve Stimulation

Part A The effect of the sympathetic nervous system on the heart is to _______. ANSWER:

decrease the heart rate increase the heart rate and increase the force of contraction increase the heart rate decrease the heart rate and decrease the force of contraction

Correct

Part B Which branch of the autonomic nervous system dominates after a large meal? ANSWER:

the sympathetic branch Both parasympathetic and sympathetic branches dominate after a large meal. neither the parasympathetic nor the sympathetic branch the parasympathetic branch

Correct

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C The sinoatrial node is located _______. ANSWER:

outside the human heart in the right atrial wall of the human heart in the interventricular septum of the human heart in the left atrial wall of the human heart

Correct

Part D Excessive vagal stimulation of the heart will result in _______. ANSWER:

a decrease in heart rate and, eventually, a temporary cessation of the heartbeat an increase in heart rate an increase in the force of contraction a decrease in the force of contraction

Correct

PhysioEx Exercise 6 > Activity 2: Activity and Post-lab Quiz for Examining the Effect of Vagus Nerve Stimulation Click on the link or the image below to launch Exercise 6 > Activity 2: Examining the Effect of Vagus Nerve Stimulation. Complete the Experiment and then answer the Post-lab Quiz questions to the right. Exercise 6 > Activity 2: Examining the Effect of Vagus Nerve Stimulation

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A When vagus nerve stimulation was applied to the frog heart, _______. ANSWER:

the heart rate slowed and eventually stopped the force of contraction increased and the heart rate slowed and eventually stopped the force of contraction decreased the force of contraction increased the force of contraction decreased and the heart rate slowed and eventually stopped

Correct

Part B What part of your tracing illustrates vagal escape? ANSWER:

the part where the heart rate slowed down the part where the heart stopped the part where the heart resumed beating the part where the force of contraction decreased

Correct

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C Research shows that in the absence of neural and hormonal influences, the SA node generates action potentials at a frequency of about 100 times per minute. However, the resting heart rate is about 70 beats per minute. What would the approximate heartrate be if the vagus nerve were severed? ANSWER:

about 100 beats per minute slower than 70 beats per minute faster than 100 beats per minute about 70 beats per minute

Correct

Part D Which of the following has the fastest rate of spontaneous depolarization? ANSWER:

Purkinje fibers AV bundle branches the SA node the AV node

Correct

PhysioEx Exercise 6 > Activity 3: Overview and Pre-lab Quiz for Examining the Effect of Temperature on Heart Rate Read the introduction and then answer the Pre-lab Quiz questions to the right. Exercise 6 > Activity 3: Examining the Effect of Temperature on Heart Rate

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A Organisms that are poikilothermic _______. ANSWER:

maintain their body temperature range even though the external temperature is changing have temperature fluctuations that coincide with the external temperature maintain their body temperature range even though the external temperature is changing and lack internal homeostatic temperature regulatory mechanisms have temperature fluctuations that coincide with the external temperature and lack internal homeostatic temperature regulatory mechanisms lack internal homeostatic temperature regulatory mechanisms

Correct

Part B Which part of the human body regulates temperature? ANSWER:

the hypothalamus the anterior pituitary gland the heart the thyroid gland

Correct https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C Heat-releasing mechanisms include which of the following? ANSWER:

vasoconstriction vasoconstriction and sweating vasodilation and sweating sweating vasodilation

Correct

PhysioEx Exercise 6 > Activity 3: Activity and Post-lab Quiz for Examining the Effect of Temperature on Heart Rate Click on the link or the image below to launch Exercise 6 > Activity 3: Examining the Effect of Temperature on Heart Rate. Complete the Experiment and then answer the Post-lab Quiz questions to the right. Exercise 6 > Activity 3: Examining the Effect of Temperature on Heart Rate

Part A For the frog heart, temperature and heart rate are _______. ANSWER:

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

directly proportional independent indirectly proportional controlled by homeostasis

Correct

Part B If the human heart were experiencing hyperthermia, what do you think would be the effect on the heart rate? ANSWER:

The heart rate would decrease. The heart rate would increase. The heart rate would increase and then return to normal. The heart rate would not change.

Correct

Part C Ringer's solution contains which of the following? ANSWER: cations anions cations, anions and electrolytes electrolytes

Correct

PhysioEx Exercise 6 > Activity 4: Overview and Pre-lab Quiz for Examining the Effects of Chemical Modifiers on Heart Rate Read the introduction and then answer the Pre-lab Quiz questions to the right. Exercise 6 > Activity 4: Examining the Effects of Chemical Modifiers on Heart Rate https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A Which of the following affect heart rate through the use of a cAMP (second messenger) system? ANSWER:

epinephrine and norepinephrine norepinephrine epinephrine acetylcholine, epinephrine and norepinephrine acetylcholine

Correct

Part B Which of the following decreases the rate of depolarization in the heart? ANSWER:

acetylcholine, epinephrine and norepinephrine norepinephrine epinephrine and norepinephrine acetylcholine epinephrine

Correct https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C The sinoatrial node has receptors for _______. ANSWER:

acetylcholine epinephrine acetylcholine, epinephrine and norepinephrine norepinephrine epinephrine and norepinephrine

Correct

Part D An adrenergic drug that worked in opposition to epinephrine would _______. ANSWER: be an agonist and increase heart rate increase heart rate decrease heart rate be an antagonist and decrease heart rate

Correct

PhysioEx Exercise 6 > Activity 4: Activity and Post-lab Quiz for Examining the Effects of Chemical Modifiers on Heart Rate Click on the link or the image below to launch Exercise 6 > Activity 4: Examining the Effects of Chemical Modifiers on Heart Rate. Complete the Experiment and then answer the Post-lab Quiz questions to the right. Exercise 6 > Activity 4: Examining the Effects of Chemical Modifiers on Heart Rate

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A Muscarine is a poison found in poisonous mushrooms. Muscarine binds to acetylcholine receptors and mimics its action. Which of the following describes the effect of muscarine? ANSWER:

Like atropine, it decreases the heart rate. Like atropine, it increases the heart rate. Like pilocarpine, it increases the heart rate. Like pilocarpine, it decreases the heart rate.

Correct

Part B Beta blockers are used to treat high blood pressure (hypertension). Which receptors do you think are being blocked? ANSWER:

alpha-adrenergic nicotinic beta-adrenergic muscarinic

Correct

Part C https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

With respect to heart rate, which of the following worked in opposition to each other? ANSWER:

digitalis and pilocarpine as well as atropine and epinephrine atropine and epinephrine digitalis and pilocarpine digitalis and atropine

Correct

Part D With respect to heart rate, which of the following had the same effect? ANSWER:

atropine and epinephrine digitalis and atropine digitalis and pilocarpine digitalis and pilocarpine as well as atropine and epinephrine

Correct

PhysioEx Exercise 6 > Activity 5: Overview and Pre-lab Quiz for Examining the Effects of Various Ions on Heart Rate Read the introduction and then answer the Pre-lab Quiz questions to the right. Exercise 6 > Activity 5: Examining the Effects of Various Ions on Heart Rate

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A When the cardiac muscle cell is at rest, the concentration of _____________ is greater on the outside of the cell. ANSWER:

potassium and sodium sodium potassium sodium and calcium calcium

Correct

Part B Modifiers that affect the force of contraction of the heart are _______. ANSWER:

antagonists inotropic agonists chronotropic

Correct

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C The movement of _______________ into the cardiac muscle cell depolarizes the cardiac muscle cell. ANSWER:

potassium sodium calcium sodium and calcium potassium, sodium and calcium

Correct

Part D Modifiers that affect heart rate are _______. ANSWER:

inotropic agonists antagonists chronotropic

Correct

PhysioEx Exercise 6 > Activity 5: Activity and Post-lab Quiz for Examining the Effects of Various Ions on Heart Rate Click on the link or the image below to launch Exercise 6 > Activity 5: Examining the Effects of Various Ions on Heart Rate. Complete the Experiment and then answer the Post-lab Quiz questions to the right. Exercise 6 > Activity 5: Examining the Effects of Various Ions on Heart Rate

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part A Which ion(s) at least initially lowered the frog heart rate in the activity you just performed? ANSWER:

calcium, potassium and sodium potassium potassium and sodium sodium calcium

Correct

Part B What effect does potassium have on the resting membrane potential of the cardiac cell? ANSWER:

Increasing extracellular potassium causes the resting membrane potential to become more positive. Increasing extracellular potassium causes the resting membrane potential to become more negative. Changes in potassium have no effect on the resting membrane potential. Increasing intracellular potassium causes the resting membrane potential to become more positive.

Correct

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Cardiovascular Physiology Ex 6: Act. 1, 2, 3, 4 and 5

Part C The cardiac cell plasma membrane is most permeable to _______________________. ANSWER:

sodium calcium It is equally permeable to all ions. potassium

Correct

Part D Calcium channel blockers block the movement of calcium _______. ANSWER:

out of the cell and decrease heart rate out of the cell and increase heart rate into the cell and increase heart rate into the cell and decrease heart rate

Correct

Part E A ___________________ drug increases the force of contraction of the heart. ANSWER: negative inotropic positive chronotropic positive inotropic negative chronotropic

Correct

Score Summary: Your score on this assignment is 97.7%. You received 4.89 out of a possible total of 5 points. https://session.masteringaandp.com/myct/assignmentPrintView?assignmentID=7822676

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