Biology Module 1

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Fitness and blood pressure

Being fit
 how well you can perform physical tasks
-strength, speed, agility, and flexibility together with stamina 
Being healthy being free from disease and infection
Blood from heart --> into arteries --> into capillaries which take blood to every cell in the body --> blood into veins --> back to heart

The pressure gets lower as it flows through the system
Pressure is at its highest when the heart contracts = SYSTOLIC PRESSURE
Pressure is at its lowest when the heart relaxes = DIASTOLIC PRESSURE
Smoking, being overweight, alcohol, stress can increase blood pressure
exercise, balanced diet, sometimes drugs can decrease
Blood pressure too high =
 strokes, brain damage & kidney damage

Blood pressure too low = poor circulation, dizziness

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High Blood Pressure and Heart Disease

Carbon Monoxide -attaches to haemoglobin in red blood cells
-reduces the amount of oxygen they can carry
-heart rate has to increase
Nicotine - increases heart rate

Saturated fats
cause a build up of Cholesterol
Cholesterol forms plaques in artery wall, narrowing arteries. Restrict blood flow
High Salt Levels can increase blood pressure

Narrow Arteries = Risk of Heart Attacks 
-Plaques form in coronary arteries
- Blood flow to heart is restricted 
-Blood clot also restricts blood flow
-Blood flow to the heart may get cut off completely = heart attack

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Eating Healthily

Carbs - energy. 
Fats - energy, insulation
Proteins - Growth and repair
Vit & Min - Various futions. Overall health
Water - Prevent dehydration 

Carbs - simple sugars
Fats - fatty acids and glycerol
Proteins - Amino Acids - They DONT get stored 

Essential Amino Acids - amino acids that cant be made in the body, so you get them from your diet.  
First Class Proteins -  you get ALL the essential amino acids - meat
Second Class Proteins - only some of the essential amino acids - plants 

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