Question

1. The target organ of a hormone is

a)where the hormone is produced

b)the stimulus that has caused the release of the hormone

c)where the hormone is coming from

d)where the hormone is going

2) Which of the following statements is false

a)rods allow us to see in dim light

b)cones detect color

c)cones are activated by bright light

d)the fovea consists of high concentration of rods

Answer 1

1. The target organ of a hormone is

THE CORRECT ANSWER D) WHERE THE HORMONE IS GOING

Where the hormones are produced are known as glands. These glands secrete hormones which enter the bloodstream and reach to specific organs or target organs to activate the regular body metabolism.

ENDOCRINE GLAND / SYSTEM The endocrine system consists of glands which bring about the overall common functions of chemical coordination in the body The endocrine glands secrete hormones directly into the blood stream, and therefou they are known as ductless glands. PROPERTIES OF HORMONES ) Hormones are secreted from the sources - directly into the wood 2) They regulate the physiological processes by chemical means. . 3) They act on target organs or cells which ала шиаllу адач, ром Clo Доила. 4) They are produced in small quantities, but are highly active. 5) Hormones are not stored in the body glands which regulation and Human Body has a few play an important role in co-ordiglion. They are as follows.

O ADRENAL GLAND @ PANCREAS / PANCREATIC GLAND 3 THYROID GLAND © PITUITARY GLAND © PARATHYROID GLAND 6 GONADS ADRENAL GLAND It is present above botu the kidereep The gland is divided into oulle loiter and unnee medulla ;) Adrenal medulla is responsible for fight, fright, fugh response.. It Juliased homene Adrenaline tuluch prepares the body for these responses. i) Adrenal in couter ueliculo hormone coilove which is responsible for melabolism of minerals and carbohydiates, protams and fats. PANCREATIC GLAND It is a hellrocure gland, that is botu enocrure as well as endocrine gland. Pancuas have Isuts et langerhans alls-

i) a They contain ww following aycells ousponselite fou glucagon (Hebased when glucose in bloo 11 - cells responscle for uisulin ( Checks fou wise un glucose levels ) 11) A-cell called somatostatin (contos a and B-cells secretion) (3) THYROID ULAND It is a butterfly Shaped luloved gland located below larynu . They secrete hormone Thyroiune and Calotron Thyromure helps in ba sal melabolisin Caicilonur frelps in bone foumation ( PITUITARY ULAND It is also knoum ao the master gland: This hormone is responsible for growth as well as responsible for functioning of othw glands Aðill Anti-luurelio llounone ou vosopressur) is responsible for increasuig the. heabsorption of water throughe kidney . © PARATHYROID LILAND It w a wry gland located in the neck region which controls the calcum level

(6 GONADS It is present in the reproductive organs In females, these honnants help in growth of Grafian follicle In males, formation of spermatogenesis.

2. the following statement that is false

THE CORRECT ANSWER IS D) THE FOVEA CONSISTS OF HIGH CONCENTRATION OF RODS

The retina is the innermost layer which is sensitive to light. There are two types of cells found in retina.

They are as follows

RODS

The rod cells are sensitive to dim light but do not respond to colour. they contain the pigment rhodopsin or visual purple which helps in visualising. the rod cells are distributed or scattered almost throughout the retina.

CONES

The cone cells are sensitive to bright light and a responsible for colour vision. They contain the pigment iodopsin and are confined to the yellow spot which is particularly called as the macula lutea. This region has maximum number of sensory cells and particularly has cones for best and bright vision.