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The heart has four chambers; the right ventricle and atrium, and the left ventricle and atrium. Deoxygenated blood, once it has travelled the entire body, enters the heart from the vena cava into the r...

Peristalsis is the mechanism by which gut muscles contract. There are two main types of muscle in the gut:

-longitudinal

-circular

Together, these muscles cont...

1) enzymes are biological catalysts that will speed up reactions by reducing activation energy for the reaction. 2) Lock and key theory concerns how the enzyme (lock) only forms a reactive complex with...

Enzymes are proteins that catalyse specific biological reactions in the body. These proteins have a specific 3D structure known as a teritary structure, with a specialised domain known as an 'active site'...

Areobic Respiration requires oxygen to release energy, producing water and carbondioxide as waste products according to equation belowC6H1206 + 6O2 = 6CO2 + 6H20Areobic respriation occurs in the mitochond...