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Negative pressure causes oxygen to enter the alveoli. Air is pulled into the lungs as the lungs expand. The alveoli are membranes of small balloon-like structures attached to the branches of the bronchial passages.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoDecreased intra-alveolar pressure due to decreased intra-pleural pressure due to the expansion of the diaphragm.
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Red blood cells transport oxygen that is bound to?
The haemoglobin macro-molecule, four O2's per molecule.
Why is oxygen needed for the final step in cellular respiration?
Oxygen is the final electron acceptor. Oxygen, with it's great electronegativity, pulls electrons through the electron transport chain where these electrons provide the motive force to pump protons into the outer lumen of the mitochondria. When these protons fall down their concentration gradient oxygen is there to pick then up with the electrons and form water.
What causes water molecules to be attracted to one another?
hydrogen and oxygen form convalent polar bondings, this means that they share valence electrons and still are electrically charged (not as strongly as ionic bonds) An oxygen atom has six valence electrons and bonds with hydrogen atoms that have one valence electron by sharing it with the oxygen atom. in that way all atoms are now stable. but the hydrogen atoms attach to one side of the oxygen atom making a stronger pull that makes that side electrically charde while the other side is positively charged. when many molecules of water are present they stick to each other form their opposite charged sides (positive+negative) hence why they attract each other
Which two biogeochemical cycles depend directly on photosynthesis?
The two biogeochemical cycles that depend directly on photosynthesis are the oxygen cycle and the carbon cycle. Photosynthesis is the driving force between these two cycles.
Why do athletes have denser bones than non-active people?
Athletes consistently put force on their bones through activity. Force causes tiny electrical currents within the bone. These electrical currents stimulate the bone-forming activity of Osteoblasts. Since Osteoblasts produce bone tissue, this causes the bone to become denser and stronger.
How does partial pressure affect the movement of oxygen from the alveoli to the blood?
Partial pressure affects the movement of oxygen from the alveoli to the blood because it is the main driving force for oxygen movement in the lungs.Oxygen passes from the air to the fluid within the alveoli, into the cell of the alveoli.
What is the diffenerce of earth and space?
There is oxygen and gravitational force on earth but there is no oxygen and gravitational force
Which of the two has more force of attraction helium or oxygen?
Oxygen will have more force of attraction
What is the force that causes objects to move in circles?
The force that causes circular motion is called "centripetal force".
What force causes what causes a static cling In a dryer?
Electricity is the force of what causes static cling in a dryer.
What is the force that causes turgor pressure?
The force that causes turgor pressure is osmosis.
What force causes static charge?
Friction is the force that causes static charge
What is the main driving force for the oxygen cycle?
Oxygen
What are the causes of force?
The causes of force is the change of energy in space, f=dE/dr.
The force with which the contract causes blood pressure?
the force with which what the contract causes blood pressure
What is a force called that causes an object to object to move in a circle is called?
A force that causes an object to move in a circle is a central force, or a centripetal force.
Is force acceleration?
No a force causes acceleration.
