Physics, Chemistry and Biology: Post your doubts here!

[Awesome12]

What happens when the
(a) atria
(b) ventricles

contract and relax?

When both of them contract, the diamter of their lumen decreases. Thus blood is further channeled to a specific area
The opposite occurs in relaxation

 

[Phoenix Blood]

None. The ovary becomes the seed. The ovary wall becomes the fruit. The endosperm is formed from the endosperm nucleus. Cotyledon is the food store

And what about the seed leaves? Arn't they the cotyledons? (...basing some logic from the words monocots and dicots...)

 

[Awesome12]

And what about the seed leaves? Arn't they the cotyledons? (...basing some logic from the words monocots and dicots...)

A seed never has leaves initially. It is only afterwards that the activity in the seed increases causing the growth of the radicle and plumule

 

[Phoenix Blood]

When both of them contract, the diamter of their lumen decreases. Thus blood is further channeled to a specific area
The opposite occurs in relaxation

I mean the atria and ventricled of the heart. How is the blood pushed in and out by their movement??

 

[Phoenix Blood]

What are B and T lymphocytes?

 

[Heba A.Moety]

What are B and T lymphocytes?

b lymphocytes are those produced in bone marrow and they have protein on their outer surface while t lymphocytes mature in thymus and they have a t-cell receptor on their cell surface, they are both types of WBCs and play imporrtant roles in defence system. Anyway if u r taking biology 0610, u dont have to go in details about this (thats what my teacher said)

 

[Phoenix Blood]

b lymphocytes are those produced in bone marrow and they have protein on their outer surface while t lymphocytes mature in thymus and they have a t-cell receptor on their cell surface, they are both types of WBCs and play imporrtant roles in defence system. Anyway if u r taking biology 0610, u dont have to go in details about this (thats what my teacher said)

But the extended curriculum demands knowledge for this too. Thanks, but

 

[ManalMansoor]

Specifically what?

Organic chemistry as a whole :'(

 

[Mai(M4!)]

what else should i study the night of the alternative to practical chemistry paper in addition to identification of anions, cations and gases and apparatus names ????
help please

 

[Awesome12]

what else should i study the night of the alternative to practical chemistry paper in addition to identification of anions, cations and gases and apparatus names ????
help please

Moles and speed of reaction

 

[shoaib672002]

Moles and speed of reaction

 

[Awesome12]

View attachment 39780

 

[shoaib672002]

View attachment 39781

That was Quick!!!!

 

[shoaib672002]

 

[shoaib672002]

ANSWER PART C ONLY

 

[Heba A.Moety]

But the extended curriculum demands knowledge for this too. Thanks, but

i'm also taking extended curriculum, in the syllabus they just mentioned the production of lymphocytes not T and B particularly. still it would be better to have some knowledge about them, and here is more information

 

[Phoenix Blood]

To find which surface area looses most water vapour in an experiment, why can't we use an evergreen plant?

 

[Phoenix Blood]

How does the umblical cord break?

 

[Phoenix Blood]

What's the difference b/w vulva and vagina and urethra?

 

[♣♠ Magnanimous ♣♠]

How does the umblical cord break?

do u mean where does it go after birth of child.