Search over 10,000 free study notes

Since arteries need to pump blood to the entire body under high pressure, they are very strong with thick muscular walls. Artery walls are also elastic, which allows them to stretch and spring back in ord...

DNA is a long list of instructions which everyone has inside the nucleus of each of their cells. A section of DNA that has instructions to make a certain protein is called a gene. Now bec...

Lipoproteins are proteins that transport hydrophobic lipids in water based (polar) solutions such as blood. The two main types you need to know about for the IB biology course as part of option D includes...

Blood from the body enters the right atrium of the heart via the vena cava. It then travels into the right ventricle by a combination of gravity and cont...

1. When an action potential arrives at the motor end plate it causes depolarisation to occur in the sarcolemma of the effector muscle cells.2) Depolar...