Control of Blood Glucose – Homeostasis Ep 3

Control of blood glucose is very important. Sufficient glucose must be delivered to cells for respiration, but too much glucose can eventually result in coma or even death. The concentration of glucose is affected by factors such as eating and exercise, and must be brought back to the normal level of about 4mmol/L to 5.5mmol/L.... Continue Reading →

Coenzymes and Cofactors – Enzymes Ep 4

So far in this series we have looked at how enzymes work, what can affect the rate at which they work, and how their action can be inhibited. Today we are looking at coenzymes and cofactors: non-proteins that are needed in order for some enzymes to be able to catalyse their reaction. Coenzymes Coenzymes are... Continue Reading →

Anaerobic Respiration and RQs – Respiration Ep 4

Anaerobic respiration happens when there isn't enough oxygen present for aerobic respiration to continue. Different types of organism use different pathways - lactate fermentation or alcoholic fermentation. For both pathways, the amount of ATP produced is much lower than in aerobic respiration because the only ATP produced comes from glycolysis (2ATP per glucose molecule). You... Continue Reading →

Oxidative Phosphorylation – Respiration Ep 3

We've reached the final stage of aerobic respiration - oxidative phosphorylation. This step takes place using proteins in the inner mitochondrial membrane. Now we will find out what all the reduced NAD and reduced FAD produced in glycolysis, the link reaction, and the Krebs cycle is used for. Oxidative phosphorylation The coenzymes NAD and FAD... Continue Reading →

The Krebs Cycle – Respiration Ep 2

The Krebs cycle has many names. Sometimes it is called the tricarboxylic acid (TCA) cycle or the citric acid cycle. But whatever name you give it, it's an important part of aerobic respiration. In the last article we covered the first two stages of aerobic respiration (glycolysis and the link reaction). We ended the link... Continue Reading →

ATP – Biological Molecules Ep 5

Today we are looking at adenosine triphosphate, often just abbreviated to ATP because as with most scientific terms, it's a bit of a mouthful. This molecule is very important in providing a quick source of energy for processes in cells. Let's have a closer look at its structure and function. Structure of ATP ATP is... Continue Reading →

Up ↑