Tag: pineal gland

Questions Related to pineal gland

A hormone responsible for normal sleep-wake cycle is?

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Epinephrine

  2. Gastrin

  3. Melatonin

  4. Insulin

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Correct Option: C
Explanation:

Melatonin is a hormone secreted by pineal gland. Immediately above the optic chiasma(in the brain) in a nucleus, are present melatonin receptors that react to this hormone and synchronise the nucleus to the $24$hrs day/night rhythm, thus informing the brain when it is day and when it is night.

Melatonin is secreted by.

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Pineal body

  2. Skin

  3. Pituitary gland

  4. Thyroid

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Correct Option: A

The pineal body is considered as

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. An endocrine gland

  2. An organ concerned with voluntary actions

  3. An organ concerned with vision

  4. A vestige of third eye and endocrine gland

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Correct Option: D
Explanation:
The pineal body is made up of the secretory cells called the pineolocytes. It is attached to the roof of the epithalamus in the diencephalon of the forebrain. During the embryonic development, it is found attached to the brow spot between the eyes of the developing embryo. In some reptiles, the pineal gland is present in the form of the parietal eye or the pineal eye which is photosensitive and is involved in regulating the diurnal cycle. In mammals, it does not form the photosensitive structure but it is involved in the secretion of the hormone called the melatonin which regulates the sleep-wake cycle. It is degraded during the bright light and accumulates in dim light.
Hence, the correct answer is 'A vestige of third eye and endocrine gland'

Identify the hormone with its correct matching of source and function.

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Oxytocin - posterior pituitary, growth and maintenance of mammary glands

  2. Melatonin- Pineal gland, regulates the normal rhythm of sleepwake cycle

  3. Progesterone- Corpus luteum, stimulation of growth and activities of female secondary sex organs

  4. Atrial natriuretic factor - ventricular wall, increases the blood pressure

Show answer
Correct Option: B
Explanation:

Melatonin, is a hormone that is produced by the pineal gland and regulates sleep and wakefulness. Blood levels of the pineal hormone melatonin are high at night and low during the day. There, a special center called the suprachiasmatic nucleus (SCN) initiates signals to other parts of the brain that control hormones, body temperature and other functions that play a role in making us feel sleepy or wide awake. During the day the pineal is inactive. When the sun goes down and darkness occurs, the pineal is "turned on" by the SCN and begins to actively produce melatonin, which is released into the blood. As a result, melatonin levels in the blood rise sharply and you begin to feel less alert. Sleep becomes more inviting. 

So, the correct answer is option B.

Gradual atrophy degeneration with ageing its shown by

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. pineal gland

  2. thymosin

  3. adreal cortex

  4. Both a and b

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Correct Option: A

Which of the following is responsible for sleep wake cycle movement?

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Dopamione

  2. Melatonin

  3. Serotonin

  4. Adrenaline

Show answer
Correct Option: B
Explanation:
Option B is correct here.

The circadian rhythm is set by the suprachiasmatic nucleus of the hypothalamus, which regulates the sleep-wake cycle.
The suprachiasmatic nucleus projects to the pineal gland to release melatonin, which promotes sleep. 
At the time of morning melatonin secretion through pineal gland get low and get stop slowly because of that person get wake up.

Melatonin is modified

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Amino acid

  2. Peptide

  3. Steroid

  4. Protein

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Correct Option: A
Explanation:
  • Melatonin is a hormone that regulates sleep-wake cycles. It is primarily released by the pineal gland. 
  • As a supplement, it is often used for the short-term treatment of trouble sleeping such as from jet lag or shift work. 
  • Melatonin is a hormone which is a protein made up of amino acids. 
  • Hence, Melatonin is a modified Amino acid. 
  • So, the correct answer is 'amino acid'.

Which of the following gland in our body controls the biological clock in the human body?

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Pitutary gland

  2. Thyroid gland

  3. Pineal gland

  4. Parathyroid gland

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Correct Option: C
Explanation:

  • The pineal gland is an endocrine gland located on the dorsal side of the forebrain. Pineal secretes a hormone called melatonin.
  • Melatonin plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body. For example, it helps in maintaining the normal rhythms of the sleep-wake cycle, body temperature. In addition, melatonin also influences metabolism, pigmentation, the menstrual cycle as well as our defense capability. Hence the gland in our body that controls biological clock is a Pineal gland.

So, the correct answer is 'Pineal gland'.

Which of these hormones may have a primary role in many circadian rhythms?

zoology endocrine system and chemical co-ordination pineal gland pituitary gland and pineal gland pineal gland and thymus

  1. Insulin

  2. Estradiol

  3. Melatonin

  4. Epinephrine

Show answer
Correct Option: C
Explanation:

The circadian rhythm or 24 hours diurnal rhythm of our body is maintained by Melatonin hormone secreted from the Pineal gland which is located on the dorsal side of forebrain. In addition, the melatonin hormone even assist in metabolism, pigmentation and even maintaining our defence capabilities.

So, the correct answer is 'Melatonin'.