[PhysioEX Chapter 6 exercise 3] PEX-06-03

Solved by ramonistry

Exercise 6: Cardiovascular Physiology: Activity 3: Examining the Effect of Temperature on Heart Rate Lab Report

Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. Organisms that usually maintain the same internal body temperature in spite of environmental temperature changes are
   You correctly answered: c. homeothermic.
2. The general name for the process that maintains the internal body temperature in humans is
   You correctly answered: a. homeostasis.
3. The electrolytes in a Ringer's solution are required to
   You correctly answered: b. provide for autorhythmicity.
4. An internal body temperature that is above the normal range is
   You correctly answered: b. hyperthermic.

Experiment Results
Predict Question:
Predict Question 1: What effect will decreasing the temperature of the Ringer's solution have on the heart rate of the frog?
Your answer : b. decrease in heart rate
Predict Question 2: What effect will increasing the temperature of the Ringer's solution have on the heart rate of the frog?
Your answer : c. increase in heart rate
Stop & Think Questions:
What effect do you think a fever of 104°F would have on heart rate?
You correctly answered: c. increase in heart rate
Experiment Data:
Solution Heart Rate
23°C Ringer's 62
5°C Ringer's 52
32°C Ringer's 72

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.

1. In the 5°C Ringer’s solution, the frog heart
   You correctly answered: c. beat slower than baseline.
2. In the 32°C Ringer’s solution, the frog heart
   You correctly answered: b. beat faster than baseline.
3. If the human heart were experiencing hypothermia, what do you think would be the effect on heart rate?
   You correctly answered: c. a decrease in heart rate
4. Without the Ringer's solution
   You correctly answered: d. spontaneous cardiac action potentials would not occur.

Review Sheet Results

1. Explain the effect that decreasing the temperature had on the frog heart. How do you think the human heart would
   respond? How well did the results compare with your prediction?
   Your answer:
   When the temperature get colder, the heart rate get slower as prediction. Also same in human case.
2. Describe why Ringer's solution is required to maintain heart contractions.
   Your answer:
   To beat, heart need some electrolytes. Ringer's solution provide that matters.
3. Explain the effect that increasing the temperature had on the frog heart. How do you think the human heart would
   respond? How well did the results compare with your prediction?
   Your answer:
   The hotter the temperature the faster the heart rate in case of the frog as predicted. Same in the case of human.