Which rat had the fastest basal metabolic rate BMR )

normal rat had the fastest basal metabolic rate because it was ot missing its pituitary gland or its thyroid gland. … normal rat has highest bmr because it has glands required to stimulate and regulate the release of the thyroid hormones.

Which rat had the fastest basal metabolic rate BMR )? Why did the metabolic rates differ between the normal rat and the surgically altered rats?

The metabolic rates differed between the normal rat and the surgically altered rats because the surgically altered rats could not produce specific hormones (t4 and TSH) since they no longer have either a thyroid or pituitary gland.

Why were ovariectomized rats used in this experiment How does the fact that the rats Areovariectomized explain their baseline T scores?

How does the fact that the rats are ovariectomized explain their baseline T scores? They were used since they no longer produce estrogen and this experiement tested estrogen therapy or calcitonin therapy. The rats all had osteoporosis since estrogen loss weakens bone growth, which is why they had baseline T scores.

How does the BMR in this case compare with the normal rat's BMR?

How does the BMR in this case compare with the normal rat’s BMR? Was the dose of thyroxine in the syringe too large, too small, or just right? – The BMR was still a little bit below the normal rat’s BMR with thyroxine.

What was the effect of thyroxine on the Thyroidectomized rat metabolic rate?

So the normal rat had more total thyroxine in its system, and thus a higher metabolic rate. Q20. The thyroidectomized rate had no thyroid gland for TSH to stimulate, so in this case TSH injections could not increase thyroid hormone production and thus could not increase metabolic rate.

What was the effect of PTU injections of Thyroidectomized rats BMR?

The effect of PTU injections on the normal rat was to decrease the BMR. The palpable goiter was due to the buildup of the precursors to thyroxine. What was the effect of PTU injections on the thyroidectomized rat’s BMR?

Why were ovariectomized rats used in this experiment?

Ovariectomized rats were used in this experiment to ensure control over the hormones in the rats. Without the ovaries, the rats were not able to produce estrogen, and therefore had low baseline T scores already, since estrogen stimulates bone growth and protects against osteoprosis.

Which of the rats developed a goiter after injection with PTU?

The Hypox rat became hyperthyroidic and developed a goiter, which is similar to the normal rat. The dose was too large. What was the effect of propylthiouracil (PTU) injections on the normal rat’s BMR?

What is the BMR of the normal rat?

The BMR of normal rats age 3-32 weeks showed a curvilinear correlation with body weight (BWt), BMR = 1.24 BWt0. 583; organ weight (OWt), BMR = 4.30 OWt0. 766; and organ protein (OPr), BMR = 4.30 OPr0.

What hormone is a hypophysectomized rat missing?

hormones missing will be triiodothyronine and thyroxine. For the hypophysectomized rat, the TSH will be missing due to the missing pituitary gland. hyperthyroidic because the thyroxine increases the metabolic rate but it did not develop goiter.

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What was the effect of thyroxine injections on the Thyroidectomized rat's BMR How does the BMR in this case compare with the normal rat's BMR?

what was the effect of thyroxine injections on the mormal rat’s BMR? The hypophysectomized rat bmr increased with tsh. the bmr was just below the normal rat but still lower the syringe amount was a little too low.

Which of the rats developed a goiter after injection with TSH explain?

What do you think will happen after you inject TSH into the three rats? The normal rat will become hyperthyroidic and develop a goiter. … The normal rat will become hypothyroidic and develop a goiter.

How is a Thyroidectomized rat treated?

SUMMARY. Cold-exposed, thyroidectomized rats have been treated with the same daily substitution dose of thyroxine (6y–12y) as prevented vacuoles from arising in the anterior pituitary basophiles of likewise thyroidectomized rats kept at a temperature of -f 25°–+30° C.

Does thyroid hormone increase metabolic rate?

Metabolism: Thyroid hormones stimulate diverse metabolic activities most tissues, leading to an increase in basal metabolic rate. One consequence of this activity is to increase body heat production, which seems to result, at least in part, from increased oxygen consumption and rates of ATP hydrolysis.

Why does propylthiouracil cause goiter?

Because the drug readily crosses placental membranes, propylthiouracil can cause fetal goiter and cretinism when administered to a pregnant woman (see Precautions, Pregnancy).

What influence does PTU have on oxygen consumption?

What influence does PTU have on the oxygen consumption? PTU lowers the rate of oxygen consumption. Oxygen consumption rate is inversely correlated with metabolic rate.

Which of the following improved the vertebral bone density of the rats?

Parathyroid hormone (1-34) increases vertebral bone mass, compressive strength, and quality in old rats. Bone. 1995 Dec;17(6):507-11. doi: 10.1016/8756-3282(95)00371-1.

What effect did the administration of calcitonin injection have on the calcitonin treated rat?

The calcitonin injections decreased the rat’s vertebral bone density.

What effect did the administration of calcitonin injections have on the calcitonin treated rat What effect did it have on bone density?

Calcitonin treatment caused a further increase in osteocalcin and P1NP in OVX rats. Calcitonin increases Wnt10b and bone formation but decreases bone resorption in ovariectomized osteoporotic rats.

Which of the following is the primary effect of the thyroid hormones T3 and T4?

The main activity of the thyroid hormones T3 and T4 is to boost the basal metabolic rates of proteins, fats, and carbohydrates as well as vitamins.

What produces thyroid stimulating hormone?

The hypothalamus and the pituitary gland, which are located in the brain, help control the thyroid gland. The hypothalamus releases thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH).

What is the meaning thyroxine?

(thy-ROK-seen) A hormone that is made by the thyroid gland and contains iodine. Thyroxine increases the rate of chemical reactions in cells and helps control growth and development. Thyroxine can also be made in the laboratory and is used to treat thyroid disorders.

Why did the metabolic rate differ?

Here’s why: One of the variables that affect your resting metabolic rate is the amount of lean muscle you have. At any given weight, the more muscle on your body, and the less fat, the higher your metabolic rate. That’s because muscle uses a lot more energy than fat while at rest (see the graphic in section one).

What effect will the saline injections have on the control rat's vertebral bone density quizlet?

The saline injections will not change the rat’s vertebral bone density.

Which patient would most likely be diagnosed with Cushing disease?

Who is more likely to have Cushing’s syndrome? Cushing’s syndrome most often affects adults, usually aged 30 to 50,1 but can also occur in children. Cushing’s syndrome affects about three times as many women as men.

What is PTU for thyroid?

Propylthiouracil is used to treat hyperthyroidism (a condition that occurs when the thyroid gland produces too much thyroid hormone, speeding the body’s metabolism, and causing certain symptoms) in adults and children 6 years of age or older. Propylthiouracil is in a class of medications called antithyroid agents.

Which one is used to measure the metabolic rate?

An organisms metabolic rate can be measured using several different pieces of apparatus including respirometers, oxygen probes, carbon dioxide probes and calorimeters.

What is your hypothesis for this experiment recall how administering PTU quizlet?

What is your hypothesis for this experiment? Recall how administering PTU affects the body’s ability to regulate its metabolic rate. … If an organism cannot regulate its temperature through metabolic rate, it will rely on shivering, which requires a greater use of oxygen.

Which hormone would be missing in a Thyroidectomized animal?

If an animal has been thyroidectomized, what hormone(s) would be missing in its blood? it would be missing Thyroxine in its blood, also known as t4, since thyroid gland is removed.

Which hormone stimulates the breakdown of polymerized glucose which hormone stimulates the breakdown of polymerized glucose?

Glucagon is released by the pancreas in response to low blood glucose levels and stimulates the breakdown of glycogen into glucose, which can be used by the body. The body’s basal metabolic rate is controlled by the thyroid hormones thyroxine (T4) and triiodothyronine (T3).