Question

explain chemical co ordination in human and give the name of function of some hormones

Answer 1

Chemical co-ordination is the type of co-ordination present between the cells or different organs of multicellular organisms. In this type of co-ordination, a group of cells releases specific hormones for co-ordination with other cells.
Some of hormones are like :
- Adrinocorticotropic Hormone
- Vasopressin
- Anti di-utheric hormone
- Adrenaline

Answer 2

Coordination in humans occurs in two levels i.e. nervous coordination and

chemical coordination. The coordination which occurs with the help of

hormones is called chemical coordination. Hormones are the organic

chemicals produced by the body, which are released into the blood. The key

feature of the hormones is that they are secreted by the ductless glands. The

glands that secrete hormones do not have ducts. Hormones are released

directly into the bloodstream and reach the target organ. The endocrine

system works in association with nervous system to control and coordinate

our bodies.

Characteristics of Hormones

 Hormones are the organic chemicals that are secreted in response to

environmental changes in or outside the body.

 Hormones are secreted by ductless glands and transported along with

the blood stream to the site of their action. The site of their production

and the organ of their influence are different.

 They can be amino-acid derivatives, proteins, or steroids.

 Being low molecular weight substances, they can easily diffuse

through the cell membrane.

 They are produced in small quantities and are effective in extremely

lower concentrations.

 Abnormal production of hormones (be it less or more) affects the body

in a negative manner.

i. Some of the hormones produced by pituitary are:

 Prolactin- Growth of mammary glands and formation of milk in them.

 TSH- Synthesis and release of thyroid hormones.

 Adrenocorticotrophic hormone (ACTH)- Stimulates synthesis and

secretion of steroid hormones called glucocorticoids from the adrenal

cortex.

 Vasopressin- Stimulates reabsorption of water from the distal tubules,

and hence, prevents loss of water through urine (diuresis); therefore,

also called anti-diuretic hormone (ADH).

ii. Thyroxine hormone is produced by thyroid gland and its functions are:

 Control of BMR (Basal metabolism rate)

 Control of working of kidney and urine formation

 Regulation of physical, mental, and sexual growth

 Regulation of growth of CNS and bones

 Regulation of carbohydrate and fat metabolism