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Endocrine Glands

Description: Hormones Types of GlandsEndocrine Glands and HormonesHormones Mechanism of Hormones ActionMechanism of Hormone ActionThyroidThyroid GlandEndocrine Glands
Number of Questions: 15
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Tags: Hormones Types of Glands Endocrine Glands and Hormones Mechanism of Hormones Action Mechanism of Hormone Action Thyroid Thyroid Gland Endocrine Glands
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Why can hormones easily pass through the capillaries?

  1. Because they are readily soluble in water

  2. Because they have low molecular weight

  3. Because they are non-antigenic

  4. Because they are organic catalysts

Show answer
Correct Option: B
Explanation:

Being a low molecular weight substance, hormones can easily pass through the capillary wall.

Choose the odd pair.

  1. Adrenaline-Thyroxin

  2. Calcitonin-Oxytocin

  3. Insulin-Parathormone

  4. Testosterone-Corticosterone

Show answer
Correct Option: C
Explanation:

Insulin is a proteinaceous hormone whereas parathormone is a peptide hormone.

Which of the following is a heterocrine gland?

  1. Parathyroid

  2. Salivary gland

  3. Pancreas

  4. Sebaceous glands

Show answer
Correct Option: C
Explanation:

Pancreas is an endocrine gland. Islets of Langerhans in the pancreas are endocrine in nature and secrete the hormones insulin and glucagon. The exocrine part secretes digestive enzymes. 

Calcitonin belongs to which of the following classes of hormones?

  1. Steroid hormones

  2. Protein hormones

  3. Peptide hormones

  4. Amino acid derivative hormones

Show answer
Correct Option: C
Explanation:

Calcitonin is a peptide hormone.

Which of the following substances delays metamorphosis in tadpoles?

  1. Thyroxine

  2. Thiourea

  3. Parathormone

  4. Insulin

Show answer
Correct Option: B
Explanation:

Thiourea is anti-thyroid substance which delays metamorphosis in tadpoles.

Which was the first hormone to be discovered?

  1. Thyroxine

  2. Secretin

  3. Insulin

  4. Testosterone

Show answer
Correct Option: B
Explanation:

Secretin was discovered in 1902. It was the first hormone to be discovered.

Which of the following endocrine glands is not present in adults?

  1. Pituitary

  2. Parathyroid

  3. Pineal

  4. Adrenal medulla

Show answer
Correct Option: C
Explanation:

Pineal gland disappears at the age of 7 and in adults it is largely a fibrous tissue, so pineal gland is not present in adults.

Isthmus is located in which of the following glands?

  1. Adrenal gland

  2. Parathyroid

  3. Thyroid gland

  4. Thymus gland

Show answer
Correct Option: C
Explanation:

Isthmus joins the two lobes of the thyroid gland.

From which of the following embryonic layers does thyroid develop?

  1. Ectoderm

  2. Endoderm

  3. Mesoderm

  4. Periderm

Show answer
Correct Option: B
Explanation:

Thyroid gland develops from the endoderm of the embryo.

Which of the following is the largest purely endocrine gland in the body?

  1. Pancreas

  2. Pituitary

  3. Thyroid gland

  4. Adrenal gland

Show answer
Correct Option: C
Explanation:

Thyroid gland is the largest purely  endocrine gland in the body. Pancreas is the largest heterocrine gland.

Which of the following is not a proteinaceous hormone?

  1. Somatotrophic hormone (SH)

  2. Gonadotrophic hormone (GH)

  3. Insulin

  4. Melanicyte stimulating hormone (MSH)

Show answer
Correct Option: D
Explanation:

MSH is a peptide hormone.

How are hormones released into blood?

  1. By osmosis

  2. By diffusion

  3. Through ducts

  4. By active transport

Show answer
Correct Option: B
Explanation:

Hormones are small molecules which directly diffuse into the blood.

What is the similarity between enzymes and hormones?

  1. They are similar with respect to their chemical composition.

  2. They are similar with respect to their molecular weight.

  3. They are similar with respect to the way they participate in a reaction.

  4. They are both effective in low concentration.

Show answer
Correct Option: D
Explanation:

They are both effective in low concentration.

Who among the following discovered hormones?

  1. Kochar

  2. Raynard

  3. Bayliss and Starling

  4. Eustachius

Show answer
Correct Option: C
Explanation:

They discovered the first hormone called 'secretin'.

Which of the following is a steroid hormone?

  1. Insulin

  2. Oxytocin

  3. Estrogen

  4. Thyroxine

Show answer
Correct Option: C
Explanation:

Estrogen is a steroid hormone.

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