Lab 9 post hw and practice exams

If the parasympathetic nervous system is acting on the heart, we would expect to observe which of the following?

- a negative chronotropic effect

If the sympathetic nervous system is acting on the heart, we would expect to observe which of the following?

- a positive inotropic effect -a positive chronotropic effect

If the sympathetic nervous system is acting on the heart, we would expect to observe which of the following?

- an increase in contractility - an increase in heart rate

Which of the following would be expected to decrease heart rate?

- applying atenolol (a beta-1-adrenergic receptor blocker) - applying cold Ringer's solution - applying acetylcholine to the heart - applying potassium to the heart

Which of the following would be expected to have a positive chronotropic effect?

- applying epinephrine to the heart - applying warm Ringer's solution to the heart

Which of the following would be expected to have a negative chronotropic effect?

- applying potassium to the heart - applying acetylcholine to the heart - applying atenolol (a beta-1-adrenergic receptor blocker) - applying cold Ringer's solution

Which of the following would be expected to decrease cardiac contractility?

- applying potassium to the heart - applying cold Ringer's solution to the heart

Several of the experiments we did in the cardiac lab are similar to experiments we did in the frog skeletal muscle lab. These experiments help to illustrate differences between skeletal and cardiac muscle. Which of the following findings is/are NOT true about similarities and/or differences between cardiac and skeletal muscle? select the single best answer

- in cardiac muscle, applying frog ringer's with extra calcium (CaCl2) shouldn't effect the strength of contraction becuase in cardiac muscle, nearly all of the calcium for muscle contraction comes from the sarcoplasmic reticulum

When the parasympathetic nervous system is acting on the SA Node it would result in which of the following ionic/permeability changes? - increase Ca2+ efflux - increase K+ influx - increase Ca2+ influx - two of these answers would happen - decrease Ca2+ influx - increase K+ efflux

- two of these answers would happen

On this screen capture, what is this frog's ventricular contractility? (no )units required, somtimes it will be necessary to use information on the X or Y axis and perform simple calculations to answer these questions

0.625

On this screen capture, what is this frog's ventricular contractility for the 4th beat (2nd to last beat) on the tracing? (no units required, somtimes it will be necessary to use information on the X or Y axis and perform simple calculations to answer these questions)

0.65 - 0.85

What is the approximate duration of atrial systole on the screen capture below? (no units required, sometimes you will need to use information from the X and Y axis to determine your answer)

0.80 - 1.10

On this screen capture, what is this frog's ventricular contractility for the first beat on the left? (no units required, somtimes it will be necessary to use information on the X or Y axis and perform simple calculations to answer these questions)

0.95 - 1.05

What is the approximate duration of atrial systole on the screen capture below? (no units required, sometimes you will need to use information from the X and Y axis to determine your answer)

1

What is the approximate duration of atrial diastole on the screen capture below? (no units required, sometimes you will need to use information from the X and Y axis to determine your answer)

1.98

In our frog heart lab we observed, or attempted to observe normal rhtyhm as well as several types of arrhythmias. What is the best description for this frog's heart rhythm?

2nd degree AV block

Which of the following drugs could be used to block the effects of norepinephrine on the SA Node?

Atenolol, a type of beta1-antagonist (blocker)

Which of the following drugs could be used to block the effects of norepinephrine on the ventricles?

Atenolol, a type of beta1-antagonist (blocker)

The sympathetic nervous system neurotransmitter that acts on the heart binds with ______________________________ in the ventricles

Beta-1-adrenergic receptors

In our frog heart lab we observed, or attempted to observe normal rhtyhm as well as several types of arrhythmias. What is the best description for this frog's heart rhythm?

PVC, premature ventricular contraction

The neurotransmitter released by parasympatheteic postganglionic nerve fibers at the SA Node is ___________________.

acetylcholine

If your subject was resting and relaxed, which of the following would we expect to observe if we injected them with atropine?

an increase in heart rate

On the following figure, what part of the cardiac cycle is highlighted?

atrial systole

Which of the following drugs could be used to block the effects of acetylcholine on the AV Node?

atropine

Which of the following drugs could be used to block the effects of acetylcholine on the SA Node?

atropine

When the parasympathetic nervous system is acting on the AV Node it would result in which of the following changes to intracellular signals (2nd messengers)?

decrease cAMP

Several of the experiments we did in the cardiac lab are similar to experiments we did in the frog skeletal muscle lab. These experiments help to illustrate differences between skeletal and cardiac muscle. For example we applied acetylchoine to the heart in lab this week and in the muscle lab acetylcholine would have been released when we stimulated the sciatic nerve to cause skeletal muscle contraction. Which of the following findings is/are NOT true about similarities and/or differences in acetylcholine's roles and effects in cardiac and skeletal muscle? select the single best answer

in cardiac muscle acetylcholine causes the muscle to contract

When the sympathetic nervous system is acting on the SA Node it would result in which of the following ionic/permeability changes?

increase Ca2+ influx

When the sympathetic nervous system is acting on the ventricles it would result in which of the following ionic/permeability changes?

increase Ca2+ influx

When the sympathetic nervous system is acting on the SA Node it would result in which of the following changes to intracellular signals (2nd messengers)?

increase cAMP

The parasympathetic nervous system neurotransmitter that acts on the heart binds with ______________________________ in the SA Node

muscarinic receptors

The neurotransmitter released by sympatheteic postganglionic nerve fibers at the SA Node is ___________________.

norepinephrine

In our frog heart lab we observed, or attempted to observe normal rhtyhm as well as several types of arrhythmias. What is the best description for this frog's heart rhythm?

normal rhythm

Several of the experiments we did in the cardiac lab are similar to experiments we did in the frog skeletal muscle lab. These experiments help to illustrate differences between skeletal and cardiac muscle.

the reason that additional voltage fails to cause a stronger response in cardiac muscle is because cardiac muscle cells have a long refractory period

Several of the experiments we did in the cardiac lab are similar to experiments we did in the frog skeletal muscle lab. These experiments help to illustrate differences between skeletal and cardiac muscle. Which of the following findings is/are NOT true about similarities and/or differences between cardiac and skeletal muscle? select the single best answer

the reason that additional voltage fails to cause a stronger response in cardiac muscle is because cardiac muscle cells have a long refractory period

On the following figure, what part of the cardiac cycle is highlighted?

ventricular systole