(Solved) Can anyone help me with Physio 8.0 exercise 6?

shockley1

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12 years ago

Can anyone help me with Physio 8.0 exercise 6?

I need help on Exercise 6 Activity 1,2,3,4,5,6,7,8... I am so bad at the labs and more than anything just need to check my answers with someone who knows what they are doing.

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duddy

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Staff Member

12 years ago

Post the actual questions you need help on, e.g. type them out, one per topic.

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shockley1 Author

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12 years ago

Activity 1 (Recording Baseline Frog Heart Activity)

Question 2. Record the number of ventricular contractions per minute
displayed in the Heart Rate window under the oscilloscope.
__________________ bpm (beats per minute)

A C T I V I T Y 2..
(Investigating the Refractory Period
of Cardiac Muscle)

3. On the basis of the recording, during which portion of the
cardiac cycle was it possible to induce an extrasystole?

4. Electrical shocks will be delivered to the muscle at a
rate of 20 stimuli/sec. What is the result?

Considering the function of the heart, why is it important that the heart muscle cannot be tetanized?

A C T I V I T Y 3
(Examining the Effect of Vagus Nerve Stimulation)

5. What is the effect of vagal stimulation on heart rate?
The

A C T I V I T Y 4
(Assessing the Effect of Temperature)

What change occurred with the cold (5°C) Ringer’s solution?
Compare to the baseline value recorded in Activity 1.

Did this change match your prediction? _________________

A C T I V I T Y 5
(Assessing the Effect of Pilocarpine)

________bpm

What happened when the heart was bathed in the pilocarpine solution?

A C T I V I T Y 6
(Assessing the Effect of Atropine)

________bpm

What is the effect of atropine on the heart?

Atropine is a drug that blocks the effect of the neurotransmitter acetylcholine, liberated by the parasympathetic nerve endings. Do your results accurately reflect this effect of atropine?

Are pilocarpine and atropine agonists or antagonists with respect to each other in their effects on heart activity?

A C T I V I T Y 7
(Assessing the Effect of Epinephrine)

________bpm

4. What happened when the heart was bathed in the epinephrine solution?

Which division of the autonomic nervous system does its effect imitate?

A C T I V I T Y 8
(Assessing the Effect of Digitalis)

4. __________bpm

What is the effect of digitalis on the heart?

A C T I V I T Y 9
(Assessing the Effect of Various Ions)

6.
Effect of Ca2+:
Does the heart rate stabilize and remain stable?

Describe your observations of the rhythm of the heartbeat.

Effect of Na+:
Does the heart rate stabilize and remain stable?

Describe your observations of the rhythm of the heartbeat

Effect of K+:
Describe what happened to the recording.

Describe your observations of the rhythm of the heartbeat.

Was there any evidence of premature beats in the recording of potassium ion effects?

Was arrhythmia produced with any of the ions tested?
If so, which? _________________________

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duddy

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Staff Member

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shockley1 Author

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12 years ago

Thanks so much four your help! ...if anyone can help me further I would appreciate it so much!

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shockley1 Author

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12 years ago

I mean thanks so much for your help!..lol...I was thinking of activity four....

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duddy

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Staff Member

12 years ago

You're welcome, but please contribute to the forum before I can continue answering them.

1 Vote

tesfish

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- Master of Science in Biology
- Bachelor of Science

Ryxxi

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12 years ago

hi,

A C T I V I T Y 4
(Assessing the Effect of Temperature)

What change occurred with the cold (5°C) Ringer’s solution?
Compare to the baseline value recorded in Activity 1.

Did this change match your prediction?
A:____With the cold (5°C) Ringer’s solution the heart rate lowered to 50BPM from the baseline value of Heart rate 60BPM in activity 1_yes this change matched my prediction that at low temperature the metabolic rate decreases.____________

A C T I V I T Y 5
(Assessing the Effect of Pilocarpine)

___45_____bpm

A:Pilocarpine a Pilocarpine is a parasympathomimetic alkaloid obtained from the leaves of tropical American shrubs from the genus Pilocarpus which simulates the parasympathetic Nervous system’s Vagus nerve which in turn slows down the heart rate.

What happened when the heart was bathed in the pilocarpine solution?
The heart rate decreased gradually.
A C T I V I T Y 6
(Assessing the Effect of Atropine)

___70_____bpm

What is the effect of atropine on the heart?
A:Increases the heart rate.

Atropine is a drug that blocks the effect of the neurotransmitter acetylcholine, liberated by the parasympathetic nerve endings. Do your results accurately reflect this effect of atropine?
A:Yes, increase in the heart rate shows us that the vagus nerve is not acting on the heart.

Are pilocarpine and atropine agonists or antagonists with respect to each other in their effects on heart activity?
A:pilocarpine- agonists(causes the nerv system to reac t)
Atropine- antagonists(blocks the action of the agonist i.e the nerv system)
A C T I V I T Y 7
(Assessing the Effect of Epinephrine)

_____79___bpm

4. What happened when the heart was bathed in the epinephrine solution?
A:The heart rate increased by 20BPM.
Which division of the autonomic nervous system does its effect imitate?
A:Epinephrine (also known as adrenaline) is a hormone and a neurotransmitter.[1] It increases heart rate, constricts blood vessels and participates in the response of the sympathetic nervous system

A C T I V I T Y 8
(Assessing the Effect of Digitalis)

4. ___41_______bpm

What is the effect of digitalis on the heart?
A : Digitalis (a drug)decreased the heart rate.
A C T I V I T Y 9
(Assessing the Effect of Various Ions)

6.
Effect of Ca2+:
Does the heart rate stabilize and remain stable?
A: No, the heart rate does not remain stable.
Describe your observations of the rhythm of the heartbeat.
A: The rhythm is distorted and not regular, it alternates between a normal contraction’s and an extended relaxation period.

Effect of Na+:
Does the heart rate stabilize and remain stable?
A:no.

Describe your observations of the rhythm of the heartbeat
A: The rhythm of the heart is slowed down and appears to be laggy.
Effect of K+:
Describe what happened to the recording.
A: There was no atrial systole, only ventricular systole was present.
Describe your observations of the rhythm of the heartbeat.
A: There was not any rhythm at all.

not sure about the last two.

1 Vote

theshortyj

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shockley1 Author

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12 years ago

Thanks so much for everyone's help! I appreciate it alot! Wonderful site! Slight Smile

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