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Systemic circulation -...

Systemic circulation -

A

Provides nutrient, `O_(2)` and other essential substances to the tissues

B

Takes `CO_(2)` and other harmful substances away for elimination

C

Both a and b

D

Carries blood from heart to lungs

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**Step-by-Step Solution for Systemic Circulation:** 1. **Definition of Systemic Circulation**: Systemic circulation refers to the part of the cardiovascular system that carries oxygenated blood away from the heart to the body and returns deoxygenated blood back to the heart. 2. **Pathway of Blood Flow**: - Blood is pumped from the left ventricle of the heart into the aorta, which is also known as the systemic aorta. - The aorta branches into smaller arteries that distribute oxygenated blood to various body tissues and organs. 3. **Gas and Nutrient Exchange**: - As blood travels through the arteries and reaches the capillaries, gas exchange occurs. Oxygen and nutrients are delivered to the tissues, while carbon dioxide and other waste products are taken up by the blood. 4. **Return of Deoxygenated Blood**: - After the exchange, the deoxygenated blood is collected by small veins, which merge into larger veins. - These veins ultimately converge to form the superior and inferior vena cava, which return the deoxygenated blood back to the right atrium of the heart. 5. **Comparison with Pulmonary Circulation**: - It is important to differentiate systemic circulation from pulmonary circulation, which is the flow of blood between the heart and lungs. Pulmonary circulation is responsible for oxygenating the blood. 6. **Functions of Systemic Circulation**: - The primary functions include delivering oxygen and nutrients to body tissues and removing carbon dioxide and other waste products for elimination. 7. **Conclusion**: - Systemic circulation is essential for maintaining the body's overall function and homeostasis by ensuring that all tissues receive the necessary substances for metabolism and health.
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