BIOLOGY CLASS 7TH JUNE 2021

-

 1.,Humans obtain their food from plants, animals, and their product by holozoic mode of nutrition.

2. The essential component of human diet are water, carbohydrate, fat, protein, roughage, vitamins and minerals.

3. The human digestive system consists of an alimentary canal and many digestive glands.


STRUCTURE AND FUNCTION OF MAIN ORGANS OF ALIMENTARY CANAL AND ASSOCIATED DIGESTIVE GLAND


The alimentary canal is a long tube with mascular walls, it extend from mouth to anus.

The uncoiled alimentary canal measures generally 9m long in which and it is several ducts of digestive gland open to secrete their digestive secretions


These organs are given below

in order in which they are involved in the digesting food mouth

2. Buccal cavity

3. Pharynx 

4. Oesophagus

5. Stomach

6. Small intestine

7. Large intestine


Mouth - :

It is a uppermost opening gives passage for ingestion of food. It is cover by 2 soft lips and opens in to a chamber called buccal cavity or oral cavity.


Buccal cavity - :

It is a large space bounded above by pallate and Thorat and Jaws. 

       The throat supports the muscular tongue which forms the Floor of the cavity and helps in ingestion of food.. The Jaws bear teeth, both upper and lower Jaws has 2 pairs of incisors, 2pairs of pre molars, 3 pairs of molars and 1 pair of canine. Thus, each jaw have total 16 teeth and adults have 32 permanent teeth.

The incisors are sharp help in cutting of food, canines are pointed and pre molars and molars helps in grinding of food.


THANK YOU so much 

Dewanshu rai 

Comments

Post a Comment

Thank you so much dear visitor
I am working hard to improve our efficiency and to gather more comfortability for you

Popular posts from this blog

Golden Globes to launch a pandemic-era Hollywood awards season

-
Image
  Los Angeles : Hollywood’s award season kicks off on Sunday at a very different Golden Globes, with a mainly virtual ceremony set to boost or dash the Oscars hopes of early frontrunners like   Nomadland   and   The Trial of the Chicago 7 . Usually a star-packed, laid-back party that draws Tinseltown’s biggest names to a Beverly Hills hotel ballroom, this pandemic edition will be broadcast from two scaled-down venues, with essential workers among the few in attendance. Deprived of its usual glamour, the Globes remain a coveted prize, and a high-profile source of momentum in the run-up to the season-crowning Oscars, which were pushed back this year to April. Nomadland , Chloe Zhao’s paean to a marginalised, older generation of Americans roaming the West in rundown vans, has long been viewed as a frontrunner for the Globes’s top prize. But it will face stiff competition from Aaron Sorkin’s  Chicago 7 , a courtroom drama about the city’s anti-war riots in 1968 with...
Read more

Modi urges use of Indian goods

-
Image
  NEW DELHI : Invoking his government’s Atmanirbhar Bharat initiative, Prime Minister Narendra Modi on Sunday said self-reliance is not just a government policy but a national spirit. “When every countryman takes pride, every countryman connects; self-reliant India doesn’t remain just an economic campaign but becomes a national spirit,” said Modi as he mentioned a series of Made in India achievements — from fighter plane Tejas to vaccines — in his monthly radio address Mann ki Baat. Making a pitch for rainwater harvesting, Modi announced the “Catch The Rain” campaign as part of which he urged the citizens to conserve rainwater for 100 days during monsoons. With most areas of the country expected to start receiving rain in May-June, the PM asked the people to start preparations for rainwater harvesting. “We shall have to understand our collective responsibilities with regard to water. Can we right away start a 100-day campaign for the sake of cleaning up water sources around us and ...
Read more

Bumrah released from team over ‘personal reasons’, to miss 4th Test

-
Image
  Ahmedabad : India will be without pace spearhead Jasprit Bumrah in the final Test against England after the 27-year-old was released from the squad for personal reasons, the BCCI said on Saturday. The right-arm seamer took four wickets in the opening Test in Chennai but was rested for the second match, which India won to level the series. Bumrah returned to play his first test at his home ground in Ahmedabad, where India triumphed inside two days to go 2-1 up in the four-match series. “Jasprit Bumrah made a request to BCCI to be released from India’s squad ahead of the fourth Test owing to personal reasons,” the board said. “Accordingly, the fast bowler has been released and he will not be available for selection for the fourth test,” it added. India have decided not to add any player to cover for his absence for the final Test, also in Ahmedabad from Thursday. Bumrah had a limited role in the third Test, where spinners Axar Patel and Ravichandran Ashwin wreaked havoc. The bowle...
Read more