Tag: endocrine system and hormone

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Questions Related to endocrine system and hormone

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Which of the following hormones is derived from a single amino acid?

  1. Thyroxine

  2. Oxytocin

  3. Estradiol

  4. Epinephrine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hormones can be classified based on their chemical nature like amino acid derivative hormones, peptide hormones, iodothyronines and steroid hormones. Hormones like epinephrine, norepinephrine, thyroxine are derived from amino acids. Epinephrine and norepinephrine are released by renal medulla. These are derived from single amino acid tyrosine. Thyroxine is released by thyroid gland. It is also derived from tyrosine amino acid by the addition of iodine.

Thus, the correct answer is 'Epinephrine.'

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

How many of these hormones are lipid soluble? FSH, LH, Iodothyronine, Epinephrine, Aldosterone, Progesterone.

  1. Two

  2. Three

  3. Four

  4. One
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Lipid soluble hormones are the hormones that can be dissolved in fats rather than in water. They are usually formed from cholesterol and lipids, therefore fat-soluble hormones can pass through cell membrane. Examples of lipid soluble hormones are progesterone and aldosterone.
So the correct answer is 'Two'.
Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Correct hormonal sequence in the rate of man is 

  1. Oestrogen, Fs, progesterone

  2. Oestrogen, progesterone, FSH

  3. FSH, progesterone, oestrogen

  4. FSH, oestrogen , progesterone
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The secretion of gonadotropin s (LH & FSH) increase gradually during the follicular phase and stimulates follicular development as well as secretion of oestrogens and progesterone. 


So the correct option is " FSH, oestrogen, progesterone". 

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Which of the following is TRUE regarding atrial natriuretic factor (ANF)?

  1. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels

  2. ANF is a peptide hormone

  3. ANF is secreted by the atrial wall of the heart

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the blood pressure is increased it results in excess of blood flow to the Heart. When the blood flow to the heart is increased it leads to the stretching of the atrial wall and the release of ANF (Atrial natriuretic polypeptide) from the atrial walls. The ANF is a polypeptide hormone which causes the vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. Hence ANF is a peptide hormone which is secreted by the atrial wall of the heart when blood pressure is increased and causes dilation of the blood vessels which results in the decrease of the blood pressure.

So, the correct option is 'All the above'.

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Which of the following hormone is steroid?

  1. Epinephrine

  2. Thyroxine

  3. Estrogen

  4. Gonadotropin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The steroids are organic compounds involved in biological processes. Steroid hormones are generally synthesized from cholesterol in gonads and adrenal glands. They are basically lipids. For example, estrogen, progesterone, testosterone, etc.
Thus, the correct answer is 'Estrogen.'
Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Hormone responsible for the absorption of water in DCT is

  1. ADH

  2. ACTH

  3. Oxytocin

  4. Insulin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Antidiuretic hormone (ADH), also known as vasopressin, is primarily responsible for increasing water reabsorption in the distal convoluted tubules and collecting ducts of the kidney. This action helps the body retain water and concentrate urine.

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Hormones are produced at a particular centralized site and transported throughout the organism by means of 

  1. a series of synapses

  2. an integrated neural pathway system.

  3. cellular communication

  4. an internal transport system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hormones are chemical messengers secreted by endocrine glands into the bloodstream or equivalent circulatory channels. This internal transport system distributes them to target organs and tissues throughout the body.

Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

Steroid-based hormones are able to act inside the cell. This is possible because

  1. there are no receptors for hormones on the cell surface

  2. hormones must interact with the nucleus to have an effect.

  3. proteins carry them into the cell

  4. steroid-based hormones are hydrophobic molecules that can pass through the cell membrane.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Steroid based hormones are fat soluble so they can enter the cell easily after which they bind to the specific steroid receptors and perform the required activities on the cell. And because they are lipids(hydrophobic molecules)  so they can enter the cell membrane.
So, the correct option is 'steroid-based hormones are hydrophobic molecules that can pass through the cell membrane'
Multiple choice zoology endocrine system and chemical co-ordination classification of hormones endocrine system and hormone hormones and metabolism

The mode of action of steroid hormones involves

  1. a second messenger.

  2. modification of enzyme activity.

  3. stimulation of DNA replication.

  4. stimulation of mRNA transcription
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Steroid hormones are lipid soluble and pass easily through the cell membrane to bind to intracellular receptors. This hormone receptor complex then enters the nucleus and directly stimulates mRNA transcription.