• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Biology; Chemistry; Physics: Post your doubts here!

Messages
385
Reaction score
954
Points
103
I have this doubt about biology. in excretion. like when the cappiliries take all the nutrients back from the convulated tubules in the kidney, why doesnt it take the waste products back too? i mean diffusion is suppose to happen because the concentration of the waste products is lower in the cappiliries but higher in the tubules.
 
Messages
343
Reaction score
220
Points
53
I have this doubt about biology. in excretion. like when the cappiliries take all the nutrients back from collecting duct in the kidney, why doesnt it take the waste products back too? i mean diffusion is suppose to happen because the concentration of the waste products is lower in the cappiliries but higher in the collecting duct.
tag me when u get the answer
 
Messages
343
Reaction score
220
Points
53
I have this doubt about biology. in excretion. like when the cappiliries take all the nutrients back from collecting duct in the kidney, why doesnt it take the waste products back too? i mean diffusion is suppose to happen because the concentration of the waste products is lower in the cappiliries but higher in the collecting duct.
i don't think u need to knw tht....im hearing the term 'collecting duct' for the very first time, nor have i ever seen any question based on knowledge regarding this.... :confused:
 
Messages
385
Reaction score
954
Points
103
i don't think u need to knw tht....im hearing the term 'collecting duct' for the very first time, nor have i ever seen any question based on knowledge regarding this.... :confused:
wait agh they take all the nutrients from the convulated tubules ._. woops. not the collecting duct
 
Messages
872
Reaction score
894
Points
103
I have this doubt about biology. in excretion. like when the cappiliries take all the nutrients back from the convulated tubules in the kidney, why doesnt it take the waste products back too? i mean diffusion is suppose to happen because the concentration of the waste products is lower in the cappiliries but higher in the tubules.
The brain sends a message to the renal tubule to select and reabsorb only certain chemicals from the glomerulus fluid as per the body needs
 
Messages
872
Reaction score
894
Points
103
explain how the effect of smoking on the alveoli could affect the general health of a smoker??
Smoke contains tar which is a carcinogenic and causes rapid growth of lung tissues. Carbon monoxide and other irritants destroy the cilia lining the inner walls of both the trachea and the bronchus/bronchioles, causing mucus to accumulate. Dust and bacteria get stuck to this mucus and induce a smokers cough. Coughing aggressively due to this causes the cross walls in the alveoli to rupture. This reduces the surface area to volume ratio of the alveoli making gaseous exchange more difficult. Thus the smoker can't breathe properly and suffers from shortness of breath
 
Messages
872
Reaction score
894
Points
103
The dry mass of the food storage region would remain the same while that of the plumule and radicle would increase gradually, as the glucose acquired from photosynthesis would directly be transported to the growing regions and there wouldn't be any need for it to be stored. Since the plant is already getting glucose from photosynthesis, it doesn't need to utilize it from the storage organ ie cotyledon so it's mass remains the same..:I think :S
 
Messages
872
Reaction score
894
Points
103
tag me if u get the answer:oops: m not good at this reproduction in plants :(
I think you probably describe a vegetative propagation method. Like for layering you use lime tree as an exàmple and explain how a low branch with a node is bent down and a ring of bark about 5 cm wide is removed from it. The ringed portion is completely covered with moist soil while the end of the branch is allowed to hang free. When roots have developed the branch is cut off from the patent plant and allowed to grow on its own. In this way, a number of daughter cheeku trees can be planted from just a single parent plant. Also the same type of child plant is allowed to grow without any changes, which is good for conmwrcial purposes. It's also inexpensive as you don't have to buy anything
 
Top