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Biology Notes

Surface area to volume ratio
Mass transport systems: have branching vessels, make sure of ideal substance direction and movement and have a medium.
Dipole: slight separation of charge between oxygen and hydrogen atoms.
There are weak bonds between many molecules, this gives water high surface tension
Water is…

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o Systemic: carries oxygenated blood from heart to cells, takes cell's deoxygenated blood back to heart
o pulmonary: carries deoxygenated blood from heart to lungs, takes lungs oxygenated blood to heart
The mass and pressure of blood is suited to the type of tube it is carried by, similar to…

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Veins oxygenated when -inferior and
Venules -pulmonary carries superior vena cava
Carries blood back from lungs to heart are the veins that
to heart from the -umbilical cord carries blood to
cells carries from heart.
placenta to fetus -veins carry a lot of
blood at a low
pressure, blood is…

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The right side of the heart receives blood from the body and pumps it to the lungs. The left side is larger because it has to receive the blood form
the lungs and pump it around the whole body.
The blood…

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Atrial systole: when atria contracts together forcing blood into the ventricle
Ventricular systole: when the ventricle contracts and forces blood into the aorta and pulmonary artery
Diastole: between contractions when the heart relaxes and fills with blood
During diastole the semilunar valves are closed and the atrioventricular valves are open,…

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Blood pressure falls due to greater distance from pulsing heart, increased friction of narrow vessels and loss of fluid into the tissues.

Temporary changes in blood pressure such as exercise, cause arteries to constrict (narrow) or dilate (widen), but permanent changes in pressure
or flow rate can cause health issues.…




please do the same for as chem unit 1!

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