Chemical Coordination and Integration Test 58

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Chemical Coordination and Integration Test 58

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Weekly Quiz Competition

Question 1
1 / -0

Match the hormone in column I with their function in column II.
List I List II
A Oxytocin 1 Prepare endometrium for implantation
B LH 2 Develops female secondary sexual characters
C Progesterone 3 Contraction of uterine wall
D Estrogen 4 Development of corpus luteum.

A
A- 3, B- 4, C- 1, D- 2

B
A- 4, B- 3, C- 2, D- 1

C
A- 3, B- 4, C- 2, D- 1

D
A- 3, B- 1, C- 2, D- 4

Solution

In human females, gonadotropins (LH and FSH) stimulates the LH surge which induces the rupture of the Graafian follicle along with the release of an ovum (ovulation) and the ruptured Graafian follicle transform as the corpus luteum.
The corpus luteum secretes large amounts of progesterone, which is essential for the maintenance of the endometrium for pregnancy.
Oxytocin is used to cause contraction of the uterus in order to start labour or increase the speed of labour, and to stop bleeding following delivery.
Estrogens are hormones that are responsible for the development and regulation of secondary sexual characters in women.
Therefore, the correct answer is option A.
Question 2
1 / -0

Hormone of hypothalamus are called as

A
Releasing hormones

B
Growth hormones

C
Tropic hormones

D
None of the above
Solution
- A releasing hormone or releasing factor is a hormone, whose main purpose is to control the release of other hormones. These are also called as hypophysiotropic or hypothalamic hormones.
- The main releasing hormones secreted by the hypothalamus are: thyrotropin-releasing hormone (TRH), corticotropin-releasing hormone (CRH), gonadotropin-releasing hormone (GnRH), growth hormone-releasing hormone (GHRH).
  
  Hence, option A is correct.
Question 3
1 / -0

The thyroid gland is homologous to which part of lower chordates?

A
Neural gland

B
Pharyngeal gill pouch

C
Nerve cord

D
Endostyle

Solution

In urochordates, cephalochordates, and in the larvae of lampreys a longitudinal ciliated groove on the ventral wall of the pharynx produces mucus to gather food particles, it is called endostyle. In addition to this, it binds iodine to the amino acid tyrosine. Though this binding iodine to amino acid tyrosine is a secondary function initially, it becomes the primary function of the endostyle when the larval lamprey metamorphoses to the adult and becomes a predator. In the adults, it starts the secreting iodine-bound tyrosine derivatives (which may function as regulatory substances) just like thyroid gland in the vertebrates. It is believed that with the evolution of jaws and a more active, predatory lifestyle the mucous secreting ability was lost and was replaced with endocrine functions as seen in the thyroid gland.
Thus, the correct option is 'Endostyle'.
Question 4
1 / -0

Hypersecretion of parathyroid hormone results in

A
Stronger bones due to increased incorporation of calcium in them

B
Deposition of calcium in various skeletal structure

C
No effect on the constitution of bones

D
Weaker bones due to increased removal of calcium from them

Solution

Hypersecretion of parathyroid hormone (PTH) increases serum calcium levels via enhanced bone resorption and renal calcium reabsorption. Due to hypersecretion of parathyroid the bones becomes weaker.
Question 5
1 / -0

Parathormone influences calcium absorption in the small intestine by regulating the metabolism of

A
Vitamin C

B
Vitamin D

C
Vitamin $${ B }_{ 6 }$$

D
Enterogasterone

Solution

The kidney processes Vitamin D into calcitriol, the active form that is most effective in assisting intestinal absorption. This process is stimulated by parathyroid hormone. Vitamin D is an important co-factor in the intestinal absorption of calcium, as it increases the number of calcium binding proteins, involved in calcium absorption through the apical membrane of enterocytes in the small intestine.
Question 6
1 / -0

Parathormone deficiency in man causes

A
Hypercalcemia

B
Hypocalcaemia

C
Goitre

D
All of the above

Solution

A low level of parathyroid hormone (hypoparathyroidism) can cause hypocalcemia, which results when too much calcium is lost in urine or when not enough calcium is moved from bones into the blood.
Question 7
1 / -0

The hormones responsible for regulation of calcium and phosphorous metabolism is secreted by

A
Pancreas

B
Thyroid

C
Thymus

D
Parathyroid

Solution

Parathormone of parathyroid gland reduces the blood phosphate level while increases the blood calcium level. Antagonistic functions of insulin and glucagon hormones of pancreas maintain the homeostasis of blood glucose level. Thyroid hormones regulate the metabolic rate of the body. Thymus hormone serves in the differentiation of lymphocytes present inside the lobules. Thus, the correct answer is D.
Question 8
1 / -0

All sex hormone can work without the help of

A
Gonadotropins

B
Placenta

C
Pituitary

D
Insulin

Solution

Anterior pituitary secretes gonadotropins (FSH and LH). Follicle stimulating hormone (FSH) and LH promote the development of gametes and production of sex hormones by leydig cells and developing follicles in male and females respectively. Human chorionic gonadotropin is a placental hormone that maintains the corpus luteum to continue the secretion of progesterone and estrogens till placenta takes over secretion of progesterone and estrogen during pregnancy. Insulin regulates blood sugar level and is not involved in secretion of sex hormones. Thus, the correct answer is D.
Question 9
1 / -0

Life saving hormone are secreted by

A
Pituitary gland

B
Pineal gland

C
Adrenal gland

D
Thyroid gland

Solution

Aldosterone of the adrenal cortex is life-saving hormone because it serves to retain sodium and water to maintain a sufficient blood volume for circulation. So, it maintains the osmolarity and volume of ECF. The pituitary gland regulates secretion of other endocrine glands. Pineal gland secretes melatonin that regulates body’s daily rhythms. Thyroid hormones regulate the basic metabolic rate. Thus, the correct answer is C.
Question 10
1 / -0

Largest amount of iodine is found in

A
Adrenal gland

B
Liver

C
Thyroid gland

D
Testes

Solution

Iodine is an essential trace element the thyroid hormones thyroxine and triiodothyronine contain iodine. It is needed for the production of thyroid hormone. The body does not make iodine, so it is an essential part of our diet. Iodine deficiency is a lack of the trace element iodine. It may result in goitre as well as cretinism, which results in developmental delays and other health problems.
So, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

	List I		List II
A	Oxytocin	1	Prepare endometrium for implantation
B	LH	2	Develops female secondary sexual characters
C	Progesterone	3	Contraction of uterine wall
D	Estrogen	4	Development of corpus luteum.

Chemical Coordination and Integration Test 58

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Chemical Coordination and Integration Test 58

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Question 1

A- 3, B- 4, C- 1, D- 2

A- 4, B- 3, C- 2, D- 1

A- 3, B- 4, C- 2, D- 1

A- 3, B- 1, C- 2, D- 4

Solution

Question 2

Releasing hormones

Growth hormones

Tropic hormones

None of the above

Solution

Question 3

Neural gland

Pharyngeal gill pouch

Nerve cord

Endostyle

Solution

Question 4

Stronger bones due to increased incorporation of calcium in them

Deposition of calcium in various skeletal structure

No effect on the constitution of bones

Weaker bones due to increased removal of calcium from them

Solution

Question 5

Vitamin C

Vitamin D

Vitamin $${ B }_{ 6 }$$

Enterogasterone

Solution

Question 6

Hypercalcemia

Hypocalcaemia

Goitre

All of the above

Solution

Question 7

Pancreas

Thyroid

Thymus

Parathyroid

Solution

Question 8

Gonadotropins

Placenta

Pituitary

Insulin

Solution

Question 9

Pituitary gland

Pineal gland

Adrenal gland

Thyroid gland

Solution

Question 10

Adrenal gland

Liver

Thyroid gland

Testes

Solution

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