Cells
What is the function of the mitochondria?
Aerobic respiration
What is the charge and mass of a neutron?
Charge: 0
Mass: 1
Where are pacemaker cells found in the heart?
Right atrium.
Define renewable fuels.
Fuels that can be replenised - not used again.
State the store of energy in batteries.
Chemical.
State three organelles you find in plant cells and not in animal cells.
Vacuole, cell wall, chloroplasts.
2
Which blood vessel transports blood from the left ventricle to the body?
Aorta.
State 4 non-renewable fuels.
Coal, oil, gas and nuclear.
Define the kinetic store of energy.
Energy stored in moving objects.
What is the name of the process that cells become specialised?
Cell differentiation.
What charge do metal ions have?
Positive.
How do statins treat CHD?
Reduce cholestral in the blood.
What are the products of complete combustion?
Carbon dioxide and water.
Describe the energy changes when burning fuels.
Chemical store decreases.
Thermal store increases.
Explain the difference between adult and embroynic stem cells.
Adult stems cells can differentiate into a limited number of cells, embroynic stem cells can become any cell.
What is a covalent bond?
When atoms share electrons to have a complete outer shell.
Compare structual differences between the arteries and veins.
Arteries have thick walls, lots of elastic fibres and narrow lumen.
Veins have thinner walls, wide lumen and valves.
Explain the difference between complete and incomplete combustion.
Complete combustion is when there is a plentiful supply of oxygen and incomplete combustion is when there is a limited supply of oxygen.
How do you calculate efficiency?
Efficiency = (useful output/total input) x 100
Define mitosis.
Cell division that makes two genetically identical cells.
Describe what happens when lithium reacts with fluorine.
Lithium loses 1 electron and becomes a positive ion. Fluorine gains 1 electron and becomes a negative ion.
Explain why the left ventricle has a thicker muscle than the right ventricle.
Left ventricle is pumping blood to the body under high pressure, right ventricle is pumping blood to the lungs.
Why is carbon monoxide a problem?
It reduces the amount of oxygen that can be transported in the blood.
Sand has a lower specific heat capacity, so needs less energy to heat up.