At the membrane barrier in lung tissue between the blood and the surrounding atmosphere, what is the....?
829141
Higher partial pressure of O2 in atmosphere that that present in the blood.\n\nRemember, blood in the lungs will be DEOXYGENATED!
313757
Air molecule???\nThe air we breath, Oxygen Nitrogen (not nitrate, just oxygen and nitrogen), goes in through your nose down to your lungs. Your red blood cells have tiny holes on them, and they "collect' the oxygen from your lungs, back to the heart, and gets pumped everywhere through your body. Your body takes the oxygen, have a bunch of reactions with them, and sends out the "waste" (carbon dioxide, etc), which goes back to your ticker, pumps it up to your lungs, and is breathed out. \n\nPlease, don't just use that as your research paper. It is much more detailed. :P
472939
Air travels to the lungs through a series of air tubes and passages. It enters the body through the nostrils or the mouth, passing down the throat to the larynx, or voice box, and then to the trachea, or windpipe. In the chest cavity the trachea divides into two branches, called the right and left bronchi or bronchial tubes, that enter the lungs.\n\nIn the adult human, each lung is 25 to 30 cm (10 to 12 in) long and roughly conical. The left lung is divided into two sections, or lobes: the superior and the inferior. The right lung is somewhat larger than the left lung and is divided into three lobes: the superior, middle, and inferior. The two lungs are separated by a structure called the mediastinum, which contains the heart, trachea, esophagus, and blood vessels. Both right and left lungs are covered by an external membrane called the pleura. The outer layer of the pleura forms the lining of the chest cavity.\n\nThe branches of the bronchi eventually narrow down to tubes of less than 1.02 mm (less than 0.04 in) in diameter. These tubes, called bronchioles, divide into even narrower tubes, called alveolar ducts. Each alveolar duct ends in a grapelike cluster of thin-walled sacs, called alveoli (a single sac is called an alveolus). From 300 million to 400 million alveoli are contained in each lung. The air sacs of both lungs have a total surface area of about 93 sq m (about 1000 sq ft), nearly 50 times the total surface area of the skin.\n\nIn addition to the network of air tubes, the lungs also contain a vast network of blood vessels. Each alveolus is surrounded by many tiny capillaries, which receive blood from arteries and empty into veins. The arteries join to form the pulmonary arteries, and the veins join to form the pulmonary veins. These large blood vessels connect the lungs with the heart.\n\n© 1993-2003 Microsoft Corporation. All rights reserved.
1098027
Alkanes-such as methane (CH4) can pass through the lipid bilayer.
13686
The alveoli spread into branches called arbor vitae.\nthe alveoli are present in your lungs and help in exchange of gases(oxygen and carbon di oxide)
663975
HIGH ALTITUDE\n\nThe high-altitude environment has low air pressure, which causes every part of our bodies to swell up--even our intestines.
895916
In the space between the pleura, NOT in the lungs...outside the lungs!  Te pleura lines the outside of the lungs and the inside of the chest wall (giving a smooth surface for the lung movment when breathing) .
773799
Cell walls surround the cell outside of the plasma membrane.  When water flows into the cell by osmosis, the cell swells until its membrane builds up pressure against the cell wall.  The cell wall prevents the cell from swelling and bursting in a hypotonic solution.
227115
air is moved into the lungs
956593
A major problem with air travel and blood vessels is sitting down and not moving the lower extremeties. Blood tends to coagulate and create thrombosis which can travel throughout the body. The thrombosis can end up in blood vessels in the brain and block arteries.
357407
First, the diaphragm contracts allowing entrance of air into the body. (I'll tell you why and how the diapraghm contracts later.) Oxygen then travels into the several parts of the lungs (I have given them in your other question) until it reaches the alveoli. The alveoli is suurounded by arteries and veins. Oxygen diffuses into the blood cells and is distributed to the different cells in the body. The mitochondria of cells use up the oxygen so as to provide us energy we need. In this process, carbon dioxide is produced. The carbond dioxide are released into the blood stream. It will travel through the blood stream until it reaches the alveoli where the blood cells empty the carbon dioxide into the alveoli to make room for the needed oxygen. When the oxygen is already used up, there will be a high concentration of carbon dioxide in the blood which will somehow raise the blood pH. An impulse is sent to the brain to let it know that the blood pH is increasing and in return, the brain signals the diaphragm to contract to tell the body to gasp for air. This cycle is repeated and is responsible for every breath we take.\n\nI hope I have helped you.
465854
The Plasma Membrane (PM) is very important and highly regulated part of the cell. Mainly composed of phospholipids (hydrophobic tails and hydrophilic heads) that are double layered. Also, many other components encompass the PM such as cholesterol (to keep the PM fluid), glycoproteins, and other proteins.\n\nThe PM serves as a major part of the cell's communication pathway. Serves as a barrier for communication with other cells, allows other molecules to anchor on the membrane, allows other cells to attach via cytoskeletal components, makes anchor junctions etc...with other cells.\n\nThink of the PM as the doors and windows of a home (the cell). It is quite important for these parts to be regulated. The doors allows certain people to leave to the home to interact with others, it allows people or items to come inside the home to interact. The windows allow for fresh air to come inside the home which can be regarded as quite essential for survival.
459076
1. The cells (and their organelles like mitochondria) swell (because the ability of the plasma membrane to control the passage of ions and water is disrupted).\n\n2. The cell contents leak out, leading to inflammation of surrounding tissues.
643625
The transfer of oxygen occurs in the tiny capillaries.  The walls of capillaries are very thin and allow close proximity to the cells in need of oxygen.  The reason that oxygen passes through, is that it is moving from a high concentration of oxygen (in the capillaries) to a low concentration of oxygen (in the cells).
791085
The cell membrane is a phospholipid bilayer, meaning there are two chains. Each chain has a serious of long non-polar tails (hydrophobic, hate water, non-permeable to polar molecules) with polar heads (hydrophilic, love water, permeable to polar molecules). The polar heads are on the outside of the membrane and the non-polar tails face the middle of the membrane. This structure prevents molecules from freely moving across the membrane. Embedded within the membrane are protein channels that are designed to specifically allow certain molecules through. Some of these channels open randomly, others require some kind of signal. They are selective by allowing molecules of certain size and/or charge (positive or negative) cross the membrane, also keeping in mind concentration gradients (molecules will move down their gradients). In some cases, molecules move against their gradients, but require energy to do it.
579619
Oxygen bind to hemoglobin which is part of the red blood cells.  It is picked up in the lungs where there are little sacs that have a very thin lining of cells.  Therefore the air you breathe in will be able to reach the blood.  Then the hemoglobin will carry blood to the parts of the body.
723400
Water is actually the main component of the cytoplasm of a cel, as well as being used in energy production cycles.  As a small, non-polar molecule, water enters the cell by way of passive diffusion called osmosis.  The semi-permeable membrane means that not just anything can cross it.  The only things that can passively cross the membrane are molecules that are, like water, small and non-polar.  Anything else must be actively transported in, or have a channel protein.