Transport In Humans

Question 1

CHD Risk Factors

Answer 1

1. Diet high in cholesterol & saturated fats
- Fatty deposits accumulate on inner walls of coronary arteries
- Lumen of coronary arteries narrower
- Less O2 transported to heart muscles cells
- Heart carry out less aerobic respiration to release energy for contractions
-> They die, CHD
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2. Smoking
- Nicotine increases fatty deposits on inner walls of coronary arteries
- Lumen of coronary arteries narrower
- Less O2 transported to heart muscles cells
- Heart carry out less aerobic respiration to release energy for contractions
-> They die, CHD
——
3. Sedentary lifestyle

Question 2

Blood clotting process

Answer 2

1. Damaged cells & platelets produce thrombokinase
2. Thrombokinase concerts inactive prothrombin into active thrombin
3. Thrombin & Ca2+ ions convert soluble fibrinogen into insoluble fibrin threads
4. insoluble fibrin threads form mesh that traps RBCs
5. Prevents excessive blood loss