Practice free Chemical Coordination and Control (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following peptide hormones, secreted by the gastrointestinal tract, is known to inhibit gastric secretion and motility?
The NCERT clearly states, 'GIP inhibits gastric secretion and motility.'
A hormonal feedback mechanism involving the hypothalamus, JGA, and heart plays a role in regulating kidney function. An increase in blood flow to the atria of the heart can cause the release of which hormone?
The NCERT in the section 'Regulation of Kidney Function' mentions, 'An increase in blood flow to the atria of the heart can cause the release' of Atrial Natriuretic Factor (ANF), which subsequently lowers blood pressure.
Hormones secreted by the gastrointestinal tract are all categorized as:
The NCERT states, 'Endocrine cells present in different parts of the gastro-intestinal tract secrete four major peptide hormones, namely gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP).'
Which of the following statements about Atrial Natriuretic Factor (ANF) is INCORRECT?
The NCERT states, 'ANF is secreted which causes dilation of the blood vessels. This reduces the blood pressure.' Therefore, increasing blood pressure is incorrect.
Match the hormone with its primary site of action:
The NCERT clearly states: 'Gastrin acts on the gastric glands...', 'Secretin acts on the exocrine pancreas...', and 'CCK acts on both pancreas and gall bladder...'. GIP inhibits gastric secretion and motility, not kidney.
Which of these is a non-endocrine tissue that secretes a hormone involved in reducing blood pressure?
The NCERT highlights that hormones are secreted by tissues that are not endocrine glands, specifically mentioning 'the atrial wall of our heart secretes a very important peptide hormone called atrial natriuretic factor (ANF), which decreases blood pressure.'
In the context of the renin-angiotensin mechanism, what is the direct role of angiotensin II that ultimately affects blood pressure and GFR?
The NCERT states, 'Angiotensin II also activates the adrenal cortex to release Aldosterone. Aldosterone causes reabsorption of Na+ and water from the distal parts of the tubule. This also leads to an increase in blood pressure and GFR.'
Match List I with List II with respect to human eye/hormones:
| List I | List II |
|---|---|
| A. CCK | I. Kidney |
| B. GIP | II. Heart |
| C. ANF | III. Gastric gland |
| D. ADH | IV. Pancreas |
CCK → Pancreas; GIP → Gastric gland; ANF → Heart (atrial source); ADH → Kidney.
Which of the following are NOT under the control of thyroid hormone?
A. Maintenance of water and electrolyte balance B. Regulation of basal metabolic rate C. Normal rhythm of sleep-wake cycle D. Development of immune system E. Support the process of R.B.Cs formation
Sleep-wake cycle is controlled by melatonin (pineal). Immune development is by thymus, not thyroid.
Which of the following is not a steroid hormone?
Glucagon is a peptide hormone (29 aa); the others are steroids derived from cholesterol.
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