Question

distinguish between arteries and veivs

Answer 1

Answer:

The parathyroid hormone (PTH), secreted by the parathyroid glands, is responsible for regulating blood calcium levels; it is released whenever blood calcium levels are low. PTH increases blood calcium levels by stimulating osteoclasts, which break down bone to release calcium into the blood stream.

Explanation:

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Answer 2

Answer:

• Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body
• . Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.