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NEET • BIOLOGY • CHEMICAL COORDINATION AND INTEGRATION

Chemical coordination and integration practice · Medium

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Showing 121-150 of 198 questions

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121 Medium
121 of 198
Understanding +4 | -1
How hormones of hypothalamus reaches Anterior pituitary ?
View answer and explanation
Correct option: C
Through portal veins
Option C (Through portal veins) is correct because hypothalamic hormones reach the anterior pituitary through the hypophyseal portal system, a specialized network of blood vessels.
122 Medium
122 of 198
Understanding +4 | -1
Which one of the following four glands is correctly matched with the accompanying description?
View answer and explanation
Correct option: B
Thymus — Starts undergoing atrophy after puberty
The correct answer is B (Thymus — Starts undergoing atrophy after puberty) because the thymus gland begins to shrink and lose function (atrophy) after puberty.
123 Medium
123 of 198
Remembering +4 | -1
Which of the following hormone is synthesized in both the brain and endocrine glands?
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Correct option: D
Somatostatin
Option D (Somatostatin) is correct because somatostatin is synthesized in both the hypothalamus (brain) and the delta cells of the pancreas (endocrine gland).
124 Medium
124 of 198
Understanding +4 | -1
Which of the following statements are true/false:  I. Calcitonin regulates the metabolism of calcium,  II. Oxytocin stimulates contraction of uterine muscles during birth,  III. Grave’s disease is caused by malfunctioning of adrenal gland,  IV. ADH stimulates absorption of water and increase the urine production.
View answer and explanation
Correct option: B
I and II are true; III and IV are false
Option B (I and II are true; III and IV are false) is correct because calcitonin regulates calcium metabolism, oxytocin stimulates uterine contractions, Grave's disease is caused by thyroid malfunction, and ADH decreases urine production.
125 Medium
125 of 198
Remembering +4 | -1
Complete the analogy : Milk-producing hormone : Prolactin :: Milk ejecting hormone :
View answer and explanation
Correct option: A
Oxytocin
Option A (Oxytocin) is correct because prolactin is the milk-producing hormone, and oxytocin is the milk-ejecting hormone.
126 Medium
126 of 198
Analyzing +4 | -1
Which of the following is not peptide hormone
View answer and explanation
Correct option: D
All the above
Option D is correct because all listed hormones (insulin, epinephrine, glucagon, testosterone, cortisol, and hypothalamic hormones) include examples that are NOT peptide hormones. Specifically, epinephrine, testosterone, and cortisol are steroid/amine hormones.
127 Medium
127 of 198
Understanding +4 | -1
Consider the following statements:  I. Calcitonin is non-iodised,  II. Calcitonin is secreted by parafollicular cells,  III. Calcitonin regulates the calcium level in blood,  IV. Calcitonin is also called as TCT (Thyrocalcitonin),  V. TCT is hyperglycemic agent (factor).  Select the option containing correct statements from the above given statements
View answer and explanation
Correct option: B
I, II, III and IV
Option B (I, II, III and IV) is correct because calcitonin is non-iodized, secreted by parafollicular cells, regulates blood calcium, and is also called TCT, while TCT is a hypocalcemic agent, not hyperglycemic.
128 Medium
128 of 198
Remembering +4 | -1
Erythropoietin
View answer and explanation
Correct option: A
Stimulates erythropoiesis
Option A (Stimulates erythropoiesis) is correct because erythropoietin is a hormone that stimulates the production of red blood cells (erythropoiesis).
129 Medium
129 of 198
Remembering +4 | -1
Spermatogenesis is under the regulatory influence of
View answer and explanation
Correct option: B
FSH
Option B (FSH) is correct because FSH (follicle-stimulating hormone) stimulates spermatogenesis in the seminiferous tubules of the testes.
130 Medium
130 of 198
Remembering +4 | -1
The hormones that initiates ejection of milk, stimulates milk production and growth of ovarian follicles are respectively known as
View answer and explanation
Correct option: B
OT, PRL and FSH
Option B is correct because Oxytocin initiates milk ejection, Prolactin stimulates milk production, and FSH stimulates the growth of ovarian follicles.
131 Medium
131 of 198
Understanding +4 | -1
Select the antagonistic pair of hormones from the options given below.
View answer and explanation
Correct option: B
TCT and PTH
Option B (TCT and PTH) is correct because TCT (Calcitonin) lowers blood calcium levels, while PTH (Parathyroid hormone) increases blood calcium levels, making them antagonistic.
132 Medium
132 of 198
Understanding +4 | -1
Which of the following are the symptoms of hypersecretion of insulin? I. Hypoglycemia,  II. Sweating,  III. Irritability,  IV. Glycosuria.  Option with correct combination is
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because hypoglycemia, sweating, and irritability are symptoms of hypersecretion of insulin.
133 Medium
133 of 198
Understanding +4 | -1
The best description of the difference between pheromones
and hormones is that
View answer and explanation
Correct option: D
Pheromones are signals that function between animals,
whereas hormones communicate among the parts within
an animal
Option D (Pheromones are signals that function between animals, whereas hormones communicate among the parts within an animal) is correct because pheromones are external chemical signals used for communication between individuals, while hormones are internal chemical signals that regulate processes within an organism.
134 Medium
134 of 198
Analyzing +4 | -1
Which of the following statements are
correct?
a) Both cortisol and glucagon stimulate the
process of gluconeogenesis.
b) Steroid hormones and iodothyronines
require second messengers for their
mechanism of action.
c) Somatostatin and vasopressin have the
same source of production.
d) PTH is hypocalcemic hormone while TCT
is hypercalcemic hormone.
View answer and explanation
Correct option: B
a and c only
Option B (a and c only) is correct because cortisol and glucagon both stimulate gluconeogenesis, and somatostatin and vasopressin share a production source.
135 Medium
135 of 198
Understanding +4 | -1
Injury to adrenal cortex is not likely to affect the secretion of which one of the following?
View answer and explanation
Correct option: C
Adrenaline
Option C (Adrenaline) is correct because adrenaline is secreted by the adrenal medulla, not the adrenal cortex.
136 Medium
136 of 198
Understanding +4 | -1
Select the correct statement:
View answer and explanation
Correct option: B
Glucocorticoids stimulate gluconeogenesis.
Option B (Glucocorticoids stimulate gluconeogenesis) is correct because glucocorticoids promote the synthesis of glucose from non-carbohydrate sources in the liver.
137 Medium
137 of 198
Understanding +4 | -1
Thymus is ___A___ in old individuals resulting in a ___B___ production of thymosin.

Choose the correct option which fills the above blanks correctly.
View answer and explanation
Correct option: C
A – degenerated, B – decreased
Option C (A – degenerated, B – decreased) is correct because the thymus gland atrophies with age, leading to a decreased production of thymosin.
138 Medium
138 of 198
Analyzing +4 | -1
Assertion: Failure of secretion of hormone
vasopressin causes diabetes mellitus in the
patient.

Reason: Vasopressin increases the volume of
urine by increasing the reabsorption of water
from the urine.
View answer and explanation
Correct option: D
If both Assertion and Reason are false
Option D (If both Assertion and Reason are false) is correct because vasopressin deficiency causes diabetes insipidus, not diabetes mellitus, and vasopressin decreases urine volume by increasing water reabsorption.
139 Medium
139 of 198
Remembering +4 | -1
Which one is not a placental hormone?
View answer and explanation
Correct option: D
Melatonin
Option D (Melatonin) is correct because melatonin is secreted by the pineal gland, not the placenta.
140 Medium
140 of 198
Remembering +4 | -1
Which one of the following is anti abortion hormone?
View answer and explanation
Correct option: B
Progesterone
Option B (Progesterone) is correct because Progesterone is essential for maintaining pregnancy and preventing uterine contractions, thus acting as an anti-abortion hormone.
141 Medium
141 of 198
Understanding +4 | -1
A deficiency of calcium in the diet would lead to
View answer and explanation
Correct option: B
An increase in parathyroid hormone in blood
Option B (An increase in parathyroid hormone in blood) is correct because low calcium levels stimulate the parathyroid glands to release PTH, increasing blood calcium.
142 Medium
142 of 198
Analyzing +4 | -1
Assertion: Cortisol produces anti-inflammatory
reactions and suppresses the immune response.

Reason: It stimulates gluconeognesis,
lipogenesis, and proteogenesis.
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C (Assertion is true but Reason is false) is correct because cortisol does have anti-inflammatory effects but stimulates gluconeogenesis, not lipogenesis and proteogenesis.
143 Medium
143 of 198
Understanding +4 | -1
Which one of the following statements is correct?
View answer and explanation
Correct option: A
Neurons regulate endocrine activity, but not vice versa.
Option B (Endocrine glands regulate neural activity and nervous system regulates endocrine glands) is correct because there is a reciprocal relationship between the nervous and endocrine systems, where each can influence the other.
144 Medium
144 of 198
Remembering +4 | -1
Cell division, protein synthesis, growth of muscle, growth of bones are regulated by
View answer and explanation
Correct option: A
Growth hormone
Option A (Growth hormone) is correct because growth hormone regulates cell division, protein synthesis, muscle growth, and bone growth.
145 Medium
145 of 198
Application +4 | -1
In a man being pursued by a dog, which of these hormones would be released quickly?
View answer and explanation
Correct option: C
Epinephrine
Option C (Epinephrine) is correct because epinephrine is released quickly in response to stress, such as being pursued.
146 Medium
146 of 198
Understanding +4 | -1
The presence of signal peptide is characteristic of which protein when they are synthesised:
View answer and explanation
Correct option: D
Insulin
Option D (Insulin) is correct because insulin is a secreted protein and requires a signal peptide for translocation into the endoplasmic reticulum during synthesis.
147 Medium
147 of 198
Understanding +4 | -1
Resorption of water and electrolytes by distal tubules of kidney and thereby diuresis reducing the loss of water through urine (diuresis) is done by
View answer and explanation
Correct option: B
Vasopressin
Option B (Vasopressin) is correct because Vasopressin (ADH) increases water reabsorption in the distal tubules and collecting ducts of the kidney, reducing water loss through urine (diuresis).
148 Medium
148 of 198
Understanding +4 | -1
What represent a link between the nervous and endocrine
systems?
View answer and explanation
Correct option: D
Hypothalamus
The correct answer is D (Hypothalamus) because it integrates nervous and endocrine functions.
149 Medium
149 of 198
Understanding +4 | -1
A health disorder that results from the deficiency of thyroxine in adults and characterized by; I.A low metabolic rate,  II.Increase in body weight,  III.Tendency to retain water in tissue, is
View answer and explanation
Correct option: C
Myxoedema
The correct answer is C (Myxoedema) because Myxoedema is a condition resulting from severe hypothyroidism in adults, characterized by a low metabolic rate, weight gain, and water retention.
150 Medium
150 of 198
Understanding +4 | -1
Identify the correct matching of a hormone with its source and function.
View answer and explanation
Correct option: C
Cortisol – adrenal cortex; carbohydrate metabolism
Option C (Cortisol – adrenal cortex; carbohydrate metabolism) is correct because cortisol is secreted by the adrenal cortex and plays a significant role in carbohydrate metabolism.
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