Platelets When the skin is cut, microorganisms have an entry point to get into the body The first line of defence is compromised In order to minimise the risk of substantial?blood loss?and entry of...
Skin The?skin and mucous?membranes form a?primary defence?against pathogens that cause infectious disease Skin?is the largest organ of the body and is covered in?microorganisms?that usually cause n...
The Structure of the Heart Heart structure The heart has?two sides: The?left?side pumps?oxygenated?blood around the body in the?systemic circulation The?right?side pumps?deoxygenated?blood to the l...
Heart Rate: Alteration by Nervous System Although the heart muscle maintains a base heart rate via?myogenic?stimulation, there are several circumstances that can cause an individual's heart rate to...
Introduction to the Heart Mammalian heart structure The heart is a hollow,?muscular organ?located in the chest cavity The heart is divided into?four chambers The two top chambers are?atria The bott...
Double Circulation The need for a circulatory system All organisms need to?transport?materials to where they are needed inside their tissues Small organisms?(or relatively inactive animals like jel...
Arteries Introduction to blood vessels The?circulatory system?of the human body contains several different types of?blood vessel: Arteries Arterioles Capillaries Venules Veins Each type of blood ve...
Discovery of the Circulation of Blood NOS: Theories are regarded as uncertain; William Harvey overturned theories developed by the ancient Greek philosopher Galen on movement of blood in the body A...
Digestive System Diagram Human Digestive System The human digestive system includes the following: Glands?- the salivary glands, and glands in the pancreas that produce digestive juices The?stomach...
