How does oxygen pass from alveoli into blood? Is this process passive, like osmosis, or is the membrane active? That is, does it resemble cell membranes, where the integrated membrane proteins are actively transporting chemicals?

(Strictly speaking, there will be small amounts of oxygen carried dissolved in the plasma, but for exam purposes the following is correct) The principal way in which oxygen is carried...

Heparin is an anticoagulant which does not allow the blood to clot in the blood vessels

External respiration is the exchange of gases between the external environment and a distributing system of the animal body, between the $color(red)"alveoli"$ of the lungs and the $color(red)"blood"$. Internal respiration...

Extrinsic or peripheral proteins are held loosely in the membrane , their removal is easy. They can be Removed simply by changing the pH. Intrinsic proteins are deeply embedded in...

Basic Definitions: = the semi-permeable structure that surrounds the cell and keeps all of the cells organelles from exploding everywhere. Cell Wall = the rigid 'armor' of the...

1) : Is the movement of molecules / ions from a region of higher to lower concentration. It may or may not occur across a semi permeable membrane. In...

No they do not require ATP. This transport occurs due to the concentration gradient. If there is high concentration of a molecule in a region then it transports to the...

Osmosis is a passive process and involves the of water molecules from where there is a high water potential to where there is a lower water potential down the water...

As major part of is made up of and since they are impermeable to water , so water soluble substances require for their movement across cell membrane

In the passive moment, it allows of small and non polar molecules to pass in or out of the cell and prevents unwanted polar ions or molecules to enter the...