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The heart is myogenic meaning that impulses (action potentials) are stimulated from the pacemaker cells of the heart. These action potentials are initiated from the sinoatrial node (SAN) which are a clust...

Arteries carry blood away from the heart whereas/or veins carry blood towards the heart.M2: Arteries have much thicker walls than veins (due to the thicker muscle and elastic layers) M3: Veins tend to hav...

Blood consists of 4 different elements: 

1. 55% is PLASMA 
   
2. other 45% are 3 different components: 
   

• red blood cells
  
• w...

So before we understand this we need to quickly explain homeostasis. This is essentially the process by which the body maintains a constant internal environment. Our external environment changes all the t...

In arteries, the main structural difference is the thickness of the arterial wall, due to an increased amount of smooth muscle, arteries have much thicker walls than both veins and capillaries to ensure t...