Hormones in Animals Questions in English

(FALSE) The statement is False. Goitre is a condition characterized by the enlargement of the thyroid gland,which is located in the neck region. Therefore,the swelling associated with goitre occurs in the neck,not the abdomen.

(TRUE) The statement is True. The pituitary gland,often referred to as the master gland,is located at the base of the brain. It secretes several hormones,including the growth hormone $(GH)$,which is essential for the growth and development of bones and tissues in the body.

(C) Iodine is an essential mineral required for the synthesis of the hormone $Thyroxine$ in the thyroid gland.
$Thyroxine$ regulates the metabolism of carbohydrates,proteins,and fats in the body.
$A$ deficiency of iodine in the diet leads to a condition known as goitre,which is characterized by the swelling of the thyroid gland.

(A) The correct answer is $A$.
Adrenaline is a hormone secreted by the adrenal glands,which are located on top of the kidneys,not by the pituitary gland.
The pituitary gland secretes hormones like growth hormone,$TSH$,and $ACTH$.
Estrogen and progesterone are female sex hormones produced by the ovaries.
Insulin is a hormone produced by the pancreas to regulate blood glucose levels.

(C) The hormone $Adrenaline$ is secreted by the adrenal glands in response to stress or emergency situations.
It is often called the 'fight-or-flight' hormone.
When released into the blood,it increases heart rate,breathing rate,and blood pressure,and diverts blood flow to muscles,preparing the body to react quickly to danger.

(C) The male sex hormone is $Testosterone$.
It is primarily produced in the testes of males.
$Testosterone$ is responsible for the development of secondary sexual characteristics in males,such as deepening of the voice,growth of facial and body hair,and muscle development.
$Estrogen$ and $Progesterone$ are female sex hormones,while $Adrenaline$ is a stress hormone produced by the adrenal glands.

(B) In the human body,endocrine glands can be either paired or unpaired.
$1$. Adrenal glands are paired,located on top of each kidney.
$2$. Testes are the primary sex organs in males and occur as a pair.
$3$. Ovaries are the primary sex organs in females and occur as a pair.
$4$. The Pituitary gland is a small,pea-sized gland located at the base of the brain and is a single,unpaired structure.
Therefore,the correct answer is $B$ (Pituitary).

(D) Endocrine glands are ductless glands that secrete hormones directly into the bloodstream.
$A$,$B$,and $C$ (Pituitary,Thyroid,and Pineal glands) are all endocrine glands.
$D$ (Salivary gland) is an exocrine gland because it secretes saliva through ducts into the oral cavity.
Therefore,the salivary gland is not an endocrine gland.

(C) Hormones are chemical messengers secreted by endocrine glands directly into the bloodstream.
They travel through the circulatory system to reach their target organs or tissues to perform specific physiological functions.
Therefore,blood is the medium of transport for hormones in the body.

(B) The $Hypothalamus$ acts as the master control center for the endocrine system. It secretes releasing hormones and inhibitory hormones that travel to the anterior pituitary gland via the hypophyseal portal system. These hormones regulate the synthesis and secretion of various hormones from the pituitary gland,thereby controlling its overall function.

(A) The $Pituitary$ gland is known as the 'master gland' of the endocrine system.
It secretes hormones that regulate the activity of other endocrine glands,such as the thyroid,adrenal glands,and gonads.
Therefore,the correct option is $A$.

(D) The anterior pituitary gland secretes several hormones including $GH$ (Growth Hormone), $TSH$ (Thyroid Stimulating Hormone), $ACTH$ (Adrenocorticotropic Hormone), $FSH$, $LH$, and $Prolactin$.
$ADH$ (Antidiuretic Hormone), also known as vasopressin, is synthesized by the hypothalamus and stored and released by the posterior pituitary gland (neurohypophysis).
Therefore, $ADH$ is not secreted by the anterior pituitary gland.

(C) The posterior pituitary gland (neurohypophysis) does not synthesize hormones itself. It stores and releases two hormones produced by the hypothalamus: $1.$ Oxytocin and $2.$ Vasopressin (Antidiuretic Hormone or $ADH$). Among the given options,Oxytocin is the hormone released by the posterior pituitary gland. $ACTH$,$FSH$,and $TSH$ are secreted by the anterior pituitary gland (adenohypophysis).

(A) The hormone $ADH$ (Antidiuretic Hormone),also known as vasopressin,is secreted by the posterior pituitary gland.
It acts on the kidney tubules to increase the reabsorption of water from the filtrate back into the blood.
This process reduces the volume of water excreted in the urine,thereby helping the body conserve water and maintain fluid balance.
Therefore,the correct option is $A$.

(B) The pituitary gland,specifically the posterior lobe (neurohypophysis),stores and releases $Oxytocin$.
$Oxytocin$ is known as the 'birth hormone' because it stimulates the contraction of smooth muscles of the uterus during childbirth.
It also acts on the mammary glands to stimulate the 'milk ejection reflex' (let-down reflex) after childbirth.
Therefore,the correct option is $B$.

(C) The pancreas acts as both an exocrine and an endocrine gland.
As an endocrine gland, it secretes hormones directly into the bloodstream.
The primary hormones produced by the pancreas are $Insulin$ and $Glucagon$, which regulate blood glucose levels.
$Parathormone$ is secreted by the parathyroid gland, $Oxytocin$ is released by the pituitary gland, and $Pancreatic juice$ is an exocrine secretion, not a hormone.

(B) Diabetes mellitus is a condition caused by the deficiency or ineffective action of the hormone $Insulin$.
$Insulin$ is produced by the beta cells of the Islets of Langerhans in the pancreas.
It plays a crucial role in regulating blood glucose levels by facilitating the uptake of glucose into cells.
When $Insulin$ levels are insufficient,blood glucose levels rise significantly,leading to the symptoms of diabetes.

(C) Diabetes mellitus is a metabolic disorder characterized by high blood glucose levels (hyperglycemia) and the presence of sugar in the urine (glycosuria). This occurs due to a deficiency of the hormone insulin or the body's inability to use insulin effectively. Insulin is produced by the pancreas and helps regulate blood sugar levels.

(D) The $Thyroid$ gland is an endocrine gland located in the neck region.
It is responsible for the production of the hormone $Thyroxine$ $(T_4)$,which plays a crucial role in regulating the body's metabolism,growth,and development.
Therefore,the correct option is $D$.

(B) The hormone $Thyroxine$,secreted by the thyroid gland,plays a crucial role in regulating the basal metabolic rate $(BMR)$.
It stimulates the metabolism of carbohydrates,proteins,and fats in the body.
Therefore,it is essential for maintaining the overall energy balance and growth of the organism.

(A) The correct matches are as follows:
$1$. Ovary produces the hormone Estrogen $(1-d)$.
$2$. Testis produces the hormone Testosterone $(2-c)$.
$3$. Pancreas produces the hormone Insulin $(3-a)$.
$4$. Thyroid gland produces the hormone Thyroxine $(4-b)$.
Therefore, the correct sequence is $(1-d), (2-c), (3-a), (4-b)$.

(D) The testes in males are responsible for the production of the primary male sex hormone,known as $Testosterone$.
This hormone plays a crucial role in the development of male reproductive organs and secondary sexual characteristics during puberty,such as the deepening of the voice,growth of facial hair,and muscle development.
$Estrogen$ and $Progesterone$ are female sex hormones produced by the ovaries,while $Aldosterone$ is a mineralocorticoid hormone produced by the adrenal glands.