When blood leaves the small arteries and enters the capillaries, the pressure drops significantly. Typically, the systolic blood pressure in small arteries can be around 80-120 mmHg, but by the time blood reaches the capillaries, the pressure usually falls to about 30 mmHg or lower. This decrease is crucial for allowing the exchange of nutrients, gases, and waste products between blood and surrounding tissues. The lower pressure in capillaries helps facilitate this exchange effectively.
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