The endocrine system is the second greatest control system of the body and has many effects on the tissues and organs. The thyroid gland, which is a part of the endocrine system, releases a hormone that maintains metabolism. This hormone is thyroxine. Thyroxine production is controlled by thyroid stimulating hormone, which is released by the pituitary gland. TSH stimulates the thyroid gland to produce thyroxine. In this experiment, the effects of TSH and thyoxine on metabolic rate are investigated.
Hypothesis:
With the information given, we tested the effects of given hormones on the body by using virtual rats. We expect to see a greater metabolic rate for the normal rat as opposed to the thyroidectomized rat. The hypox rat is expected to have the lowest metabolic rate. Metabolic rate will increase once thyroxine is injected. TSH will increase the metabolic rate of all the rats with …show more content…
The metabolic rate for the normal rat was 1865.0 ml O2/kg/hr, the rate for the thyroidectomized rat was 1512.0 ml O2/kg/hr, and the rate for the hypox rat was 1836.0 ml O2/kg/hr.
With TSH Normal Rat Thyroidextomized Rat Hypophysectomized Rat
Weight 250.9 245.9 245.0 ml O2 in 1min. 7.8 6.2 7.5 ml O2 in 1 hour 468.0 372.0 450.0
Metabolic Rate 1865.0 1512.0 1836.0
Activity 4: Determining the Effects of Propylthiouracil on Metabolic Rate
The metabolic rate was calculated after the rats had been injected with Propylthiouracil. The metabolic rate for the normal rat was 1491 ml O2/kg/hr, the rate for the thyroidectomized rat was 1468 ml O2/kg/hr, and the rate for the hypox rat was 1495 ml O2/kg/hr.
With Propylthiouracil Normal Rat Thyroidextomized Rat Hypophysectomized Rat
Weight 249.4 245.1 244.8 ml O2 in 1min. 6.2 6.0 6.1 ml O2 in 1 hour 372.0 360.0 366.0
Metabolic Rate 1491.0 1468.0 1495.0