Anaerobic respiration and Respirometers

What is the process of anaerobic respiration in animals

Glycolysis happens as usual

As there is no O2 oxidative phosphorylation will not occur

NADH is not being oxidised so eventually there will be no more NAD so glycolysis would stop

Pyruvate is reduced into lactate

NADH is oxidised which allows glycolysis to continue

Lactate is acidic and causes muscle fatigue, so instead is sent off to the liver to be metabolised

What is the process of anaerobic respiration called in plants

Fermentation

What is the process of anaerobic respiration in plants

Pyruvate is decarboxylated then reduced to ethanol

NADH is oxidised to NAD allowing glycolysis to carry on

Ethanol is toxic as it can dissolve cell membranes, so it is used as biofuel, or brewing, or breadmaking

How does a respirometer work

It measures the amount of O2 taken in by an organism by measuring the distance a liquid moves.

Seeds would respire so O2 is used up and O2 from experimental tube would diffuse to the seeds.

CO2 produced via respiration is absorbed by the Soda lime

Volume of gas in experimental tube decreases so the pressure decreases

Pressure is higher in control tube, so the red liquid moves towards the experimental tube ( down the pressure gradient)

The liquid moves because the air in the U tube moves from the control into the experimental pushig the liquid

What is the formula for calculating rate of respiration

Volume/ (time x mass)

How is uncertainty calculated

distance +- uncertainty of instrument