the heart

1) Right atrium has less muscle

2) Right atrium pumps blood to right ventricle

3) Right ventricle pumps blood to lungs

Elastic Fibres: allow stretching to accommodate higher pressure      

Folded Endothelium: allow stretching to accommodate higher pressure

(Smooth) Muscle: muscle can contract / exert pressure       

Smooth lining / Endothelium: reduce friction / resistance to blood flow                     

Narrow Lumen: maintain (high) blood pressure

Collagen:  avoids {rupture / damage                                                                     

• Lower blood cholesterol
• Inhibition of cholesterol synthesis in liver
• Reduce risk of CVD

•  Increased kinetic energy = increases movement of molecules
• Phospholipids moving
• (Membrane) proteins denature
• More denaturation at higher temperatures / above 40  C 
•  Pigment can escape from the cell when the membrane is disrupted

• Standardise betroot tissue {source & size}
• Rinse beetroot
• Use waterbath to maintain temperature
• Repeats at each temperature between 20-90C
• Calibration /zeroing  of colorimeter