Which one of the following is an example of a negative feedback loop in humans?

1. Constriction of skin blood vessels and contraction of skeletal
muscles when it is too cold
2. Secretion of tears after falling of sand particles into the eye
3. Salivation of the mouth at the sight of delicious food
4. secretion of sweat glands and constriction of the skin blood
vessels when it is too hot

Subtopic:  Mechanism of Hormone Action |
 54%
AIPMT - 2007
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Which one of the following does not act as a neurotransmitter?

1. Acetylcholine

2. Epinephrine

3. Nor epinephrine

4. Cortisone

Subtopic:  Adrenal Medulla | Adrenal Cortex: Cortisol | Mechanism of Hormone Action |
 76%
AIPMT - 2006
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Which of the following hormone secretes a gastric secretion?

1. Entero gastrone

2. Gastrin

3. CCK-PZ

4. Villikinin

Subtopic:  Hormones of Heart, Kidney and Gastrointestinal Tract |
 87%
From NCERT
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Steroid hormones work as:

1. They enter into target cells and bind with specific receptors and activate specific genes to form protein

2. They bind to cell membrane

3. They catalyze the formation of cAMP

4. None of the above

Subtopic:  Mechanism of Hormone Action |
 82%
From NCERT
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Adrenaline and noradrenaline are hormones that act as:

1. Energy-producing agents

2. Food storage materials

3. Neurotransmitters

4. Energy-storing substances

Subtopic:  Adrenal Medulla |
 75%
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Calcitonin is a thyroid hormone, which:

1. elevates potassium level in blood

2. lowers calcium level in blood

3. elevates calcium level in blood

4. has no effect on calcium

Subtopic:  Thyroid Gland Part I | Thyroid Gland Part II |
 66%
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The contraction of the gall bladder is due to:

1. gastrin

2. secretin

3. cholecystokinin

4. enterogastrone

Subtopic:  Misc. Hormones |
 79%
From NCERT
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Glycogenolysis involves:

1. conversion of sugar into glycogen

2. oxidation of sugar

3. conversion of glycogen into sugar

4. conversion of glycogen into fat

Subtopic:  Pancreas |
 75%
From NCERT
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Endemic goiter is a state of:

1. Normal thyroid function

2. Moderate thyroid function

3. Increased thyroid function

4. Decrease thyroid function

Subtopic:  Thyroid Gland Part I | Thyroid Gland Part II |
 54%
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Hormone responsible for the secretion of milk after parturition is:

1. ACTA

2. LH

3. ICSH

4. Prolactin

Subtopic:  Adenohypophysis & Hypothalamus |
 90%
From NCERT
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