+1(978)310-4246 credencewriters@gmail.com
  

Description

Answer the questions that written in the file based on physiological detailed explanations. Make sure to use the data in the file, not other data. The answer should be explained carfully. Do not just copy from other files. Some tutors just copy from course hero and I don’t like that type.

Choose one:
Starling’s law states that the heart contracts more forcefully when the muscle is
prestretched. What do you predict will happen during periods of activity?
Greater filling of the ventricles will lead to less forceful ejection of blood from the heart.
Greater filling of the ventricles will lead to more forceful ejection of blood from the
heart.
Less filling of the ventricles will lead to more forceful ejection of blood from the heart.
Fill in the blanks for the following:
Frogs are poikilotherms, which means they can’t internally control their temperature.
________ temperatures increase heart rate while ________ temperatures decrease
heart rate. Therefore the activity of poikilotherms is dependent on the external
temperature.
Cold; warm.
Warm; cold.
Complete the table to predict the effect of different drugs on the denervated frog
heart.
Neurotransmitter, Action
Hormone or Drug
Acetylcholine
Released by parasympathetic nerves,
such as the vagus nerve.
Epinephrine
Released into the bloodstream by the
adrenal medulla.
Atropine
Blocks muscarinic acetylcholine
receptors in the heart.
Pilocarpine
Stimulates muscarinic acetylcholine
receptors in the heart.
Effect on Heart
Describe the behavior of the frog heart. Do you observe any delay between the atrial
and ventricular contractions? Explain the basis for this delay from your knowledge of the
human heart. Make sure to talk about the effect of each of the following: changing
temperature, stretching, acetylcholine, epinephrine, atropine, and pilocarpine.
ECG and Cardiac Cycle
Time Between QRS and the Start of Ventricular Contraction (ms)
1
82.5
2
95
3
82.5
4
92.5
5
117
Average 93.90
Describe the relationship between the QRS complex and the beginning of ventricular
contraction. What is the physiological significance of this relationship?
How did temperature affect heart rate?
Why is the Q10 a useful concept?
What is Starling’s law of the heart? Does your data support this law?
When you exercise, venous return of blood to your heart increases. Based on your
knowledge of Starling’s law, what would happen to the amount of blood ejected from
the left ventricle per contraction (stroke volume) during exercise?
Describe the mechanisms by which acetylcholine affects heart rate.
Describe the mechanisms by which epinephrine affects heart rate.
Describe the mechanisms by which atropine followed by acetylcholine affects heart
rate.
Epinephrine mimics the effects of which branch of the autonomic nervous system?
Compare the effect of acetylcholine on cardiac muscle with its effect on skeletal muscle.
Can you explain the mechanistic basis for the difference?

Purchase answer to see full
attachment

  
error: Content is protected !!