Endocrine System Physiology Lab Report

Week 3 Lab 4 – Endocrine System Physiology - Activities 1-4 pages 43 - 48

Latasha Roberts
March 25, 20012
SC145L-8H
Introduction:
(please post an introduction to the lab, include what you will be doing for each activity)

Activity 1: Determining Baseline Metabolic Rates

Data: (add your results here in numbers - Chart 1 is used in Activities 1-4)

Chart 1 – Effects of Hormones on Metabolic Rate Rat Types
Baseline: Normal Thyroidectomized Hypophysectomized
Weight 249.9g 245.3g 244.4g ml O2, 1 min. 7.0ml 6.1ml 6.1ml ml O2/hr. 420ml 366ml 366ml
Metabolic Rate 1680.72ml O2/kg/hr 1492.45ml/O2/kg/hr 1497.54ml/O2/kg/hr

With thyroxine:
Weight 250.0g 245.1g 244.9g ml O2, 1 min. 7.9ml 7.5ml 7.4ml ml O2/hr. 474ml 450ml
Normal Rat

1-2: Why did the metabolic rates differ? The hypophysectomized rat lacked thyroid-stimulating hormone. The thyroidectomized rat lacked thyroxine hormone.

Summary:

In this Activity, I learned/observed that: write 1-2 sentences on what you observed by doing this experiment – think “big picture”

Activity 2: Determining the Effect of Thyroxine on Metabolic Rate

Data:
Fill in Chart 1

Questions: answer each question; use full sentences; ask instructor if you need help
2-1: What was the effect of thyroxine on the normal rat's metabolic rate? How does it compare to the normal rat's baseline metabolic rate? Thyroxine caused the metabolic rate to increase; it was faster.

2-2: Why was this effect seen?

2-3: What was the effect of thyroxine on the thyroidectomized rat's metabolic rate? How does it compare to the thyroidectomized rat's baseline metabolic rate?

2-4: Why was this effect seen?

2-5: What was the effect of thyroxine on the hypophysectomized rat's metabolic rate? How does it compare to the hypophysectomized rat's baseline metabolic rate?

2-6: Why was this effect seen?