Edexcel A Level Biology A | TOPIC 1 STUDY GUIDE
Solvent Substances dissolve in it e.g. water+++
dipolar Having a slightly positive charge and negative charge
Cohesive They tend to stick together
Cohesion Attraction between molecules of the same type
, Which side of the heart left
carries oxygenated blood?
Why is the left side of the Because it carries oxygenated blood
heart thicker?
Where does blood from Right atrium
the vena cava go to?
Where does blood from Left atrium
the pulmonary vein go to?
Why does the heart have It needs oxygen it's own supply of oxygen to pump the blood
coronary arteries on the around the body
surface?
What is the valve between Atrioventricular valves
the atrium and ventricle?
What is the valve between Semi lunar valve
the right ventricle and the
pulmonary artery?
What is the valve between Semi lunar valve
the left ventricle and aorta?
What do valves do? Stop the back flow of blood
What are the three blood Arteries, veins and capillaries
vessels?
What do the arteries do? Carry blood from the heart to the rest of the body
What are features of the Thick muscle wall, lots elastic fibres, small lumen
artery?
What are the features for in To withstand the high pressure of the blood, to be able to
an artery stretch and recoil
What do veins do? Take blood back to the heart
What are features of veins? Large lumen, thin muscle wall, little elastic tissue
Why do veins have different Veins are different because the blood that goes to them are
features to arteries? under lower pressure.
what is atheroma? it is a fatty deposit that makes the lumen get smaller.
1) there is damage to the endothelial wall
2) this triggers an inflammatory response
3) white blood cells accumulate with chemicals in the blood
How does atherosclerosis 4) WBC enlarge with cholesterol and form a atheroma
occur? 5) this stretches the artery making it lose elasticity
6) calcium deposits and fibrous tissue build up forming plaque
7) lumen size reduces, higher chance of damage
it produces postive feedback of the lumen getting
what does atheroma do?
smaller ad there being a higher chance of damage
to the arteries.
1) Platelets in the blood release serotonin and
thromboplastin
Solvent Substances dissolve in it e.g. water+++
dipolar Having a slightly positive charge and negative charge
Cohesive They tend to stick together
Cohesion Attraction between molecules of the same type
, Which side of the heart left
carries oxygenated blood?
Why is the left side of the Because it carries oxygenated blood
heart thicker?
Where does blood from Right atrium
the vena cava go to?
Where does blood from Left atrium
the pulmonary vein go to?
Why does the heart have It needs oxygen it's own supply of oxygen to pump the blood
coronary arteries on the around the body
surface?
What is the valve between Atrioventricular valves
the atrium and ventricle?
What is the valve between Semi lunar valve
the right ventricle and the
pulmonary artery?
What is the valve between Semi lunar valve
the left ventricle and aorta?
What do valves do? Stop the back flow of blood
What are the three blood Arteries, veins and capillaries
vessels?
What do the arteries do? Carry blood from the heart to the rest of the body
What are features of the Thick muscle wall, lots elastic fibres, small lumen
artery?
What are the features for in To withstand the high pressure of the blood, to be able to
an artery stretch and recoil
What do veins do? Take blood back to the heart
What are features of veins? Large lumen, thin muscle wall, little elastic tissue
Why do veins have different Veins are different because the blood that goes to them are
features to arteries? under lower pressure.
what is atheroma? it is a fatty deposit that makes the lumen get smaller.
1) there is damage to the endothelial wall
2) this triggers an inflammatory response
3) white blood cells accumulate with chemicals in the blood
How does atherosclerosis 4) WBC enlarge with cholesterol and form a atheroma
occur? 5) this stretches the artery making it lose elasticity
6) calcium deposits and fibrous tissue build up forming plaque
7) lumen size reduces, higher chance of damage
it produces postive feedback of the lumen getting
what does atheroma do?
smaller ad there being a higher chance of damage
to the arteries.
1) Platelets in the blood release serotonin and
thromboplastin
