Chemical Coordination and Integration Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about oxytocin is correct?

Oxytocin promotes uterine contractions during childbirth.
Oxytocin is secreted by the anterior pituitary.
Oxytocin reduces milk ejection from the mammary glands.
Oxytocin secretion is inhibited during labor.
1

Oxytocin, secreted by the posterior pituitary, stimulates uterine contractions during childbirth and promotes milk ejection.

The adrenal medulla secretes which of the following hormones?

Cortisol and Aldosterone
Epinephrine and Norepinephrine
Insulin and Glucagon
Thyroxine and Calcitonin
2

The adrenal medulla secretes epinephrine and norepinephrine, which help the body respond to stress.

Which hormone is secreted by the pancreas and inhibits both insulin and glucagon secretion?

Somatostatin
Cortisol
Gastrin
Secretin
1

Somatostatin, secreted by the pancreas, inhibits the release of insulin and glucagon to regulate blood sugar levels.

Which of the following hormones plays a role in regulating biological rhythms?

Melatonin
Thyroxine
Insulin
Aldosterone
1

Melatonin, secreted by the pineal gland, regulates sleep-wake cycles and biological rhythms.

Which of the following statements about calcitonin is correct?

Calcitonin increases blood calcium levels.
Calcitonin is secreted by the parathyroid gland.
Calcitonin inhibits bone resorption.
Calcitonin is secreted in response to low blood calcium levels.
3

Calcitonin, secreted by the thyroid gland, inhibits bone resorption, thereby reducing blood calcium levels.

Which hormone promotes the uptake of glucose by cells and lowers blood sugar levels?

Glucagon
Insulin
Cortisol
Adrenaline
2

Insulin, secreted by the pancreas, facilitates glucose uptake by cells, reducing blood sugar levels.

Which of the following is a correct statement regarding aldosterone?

Aldosterone regulates blood sodium and potassium levels.
Aldosterone is secreted by the adrenal medulla.
Aldosterone decreases sodium reabsorption in the kidneys.
Aldosterone is secreted in response to low blood glucose levels.
1

Aldosterone, secreted by the adrenal cortex, regulates sodium and potassium balance by increasing sodium reabsorption and potassium excretion in the kidneys.

Which of the following statements about the endocrine system is incorrect?

Endocrine glands are ductless and release hormones into the bloodstream.
Hormones act on specific target cells with receptors for them.
Hormones always act immediately upon secretion.
The hypothalamus controls endocrine functions via releasing and inhibiting hormones.
3

Some hormones act immediately, while others have long-term effects (e.g., growth hormone, thyroid hormones).

Which of the following statements about the posterior pituitary is incorrect?

The posterior pituitary stores and releases ADH and oxytocin.
The posterior pituitary synthesizes its own hormones.
The posterior pituitary is connected to the hypothalamus.
The posterior pituitary releases hormones into the bloodstream.
2

The posterior pituitary does not synthesize hormones; it only stores and releases ADH and oxytocin, which are produced by the hypothalamus.

Which hormone is primarily responsible for maintaining sodium and potassium balance?

Insulin
Aldosterone
Vasopressin
Thyroxine
2

Aldosterone, a mineralocorticoid secreted by the adrenal cortex, regulates sodium and potassium balance in the body.

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