chapter 2 HOMEOSTASIS CLASS 10TH ( WHAT IS HOMEOSTASIS ? EXPLAIN WITH ITS EXAMPLES)

 HOMEOSTASIS 

WHAT IS HOMEOSTASIS ? EXPLAIN WITH ITS EXAMPLES.

DEFINITION

The maintenance of the internal conditions of the human body at equilibrium  , despite changes in the external environment is called homeostasis.

EXAMPLES

• BODY TEMPERATURE

The core temperature of human body remains at about 37℃ despite fluctuations in the surrounding air temperature.

• BLOOD GLUCOSE LEVEL

the blood glucose level remains about 1g per litre despite eating a meal rich in carbohydrates.

IMPORTANCE OF HOMEOSTASIS

Body cells need the internal enviroment in which conditions do not change much. Stable internal conditions are important for the efficient functioning of enzymes.

TYPES OF HOMEOSTASIS

 There are three types of homeostasis:

• THERMOREGULATION     
•  OSMOREGULATION
• EXCRETION

✓ THERMOREGULATION

      DEFINITION

The maintainance of internal temperature of internal temperature of body is called Thermoregulation .

      EXAMPLE

The enzyme of body work  best at particular temperatures .

Any change in body temperature may affect the functioning of enzymes.

OSMOREGULATION

      DEFINITION

The maintenance of the amounts of water and salts in the body fluid is called osmoregulation

IMPORTANCE

The relative amounts of water and salts in body fluid and inside cells control the processess of diffusion and osmosis ,which are essential for the functioning of cells.

EXAMPLE

An example is freshwater fish. ... Some marine fish, like sharks, have adopted a different, efficient mechanism to conserve water, i.e., osmoregulation. 

EXCRETION

The elimination of metabolic waste from body to maintain the internal conditions at equillibrium is called excretion.

EXAMPLE

Urine is an example of excretion.