Biological membranes are selectively permeable, allowing certain molecules to cross the membrane, but not others. classify the molecules or ions depending on how they cross a biological membrane. note that some of these examples may also utilize active transport to traverse a membrane. however, this question is limited to passive transport processes only.

Biological membranes are selectively permeable because they permit the transport of small molecules,gases and non polar,hydrophobic compounds across themselves.

Explanation:

Water is passed through the plasma membrane by facilitated diffusion with the help of a protein known as aquaporins which act as channel proteins.

     Various ions such as Na+,K+,Ca2+ are transport across the plasma membrane through various ion channel with the additional requirement of energy in form of ATP.

Example   Na+K+ATPase,H+ATPase,Ca2+ATPase etc.

Passive transport helps in the transport of gases,water molecules along their concentration gradient that is from high concentration region to the region of low concentration until the concentration of solute molecules in both the region becomes equal.

Example Diffusion,Osmosis.

it have destructive character

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation: