1. Which hormone is primarily responsible for the regulation of plasma calcium concentration? A. Calcitonin B. Parathyroid hormone C. Thyroid-stimulating hormone D. Cortisol Answer: B. Parathyroid hormone Rationale: Parathyroid hormone is the principal regulator of plasma calcium concentration. It increases blood calcium levels by stimulating osteoclasts to break down bone matrix and release calcium. 2. During the cardiac cycle, the "lub" sound of the heart corresponds to which event? A. Closure of the semilunar valves B. Closure of the atrioventricular valves C. Opening of the atrioventricular valves D. Opening of the semilunar valves Answer: B. Closure of the atrio

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jordancarter 6 months ago

This study guide is clear, well-organized, and covers all the essential topics. The explanations are concise, making complex concepts easier to understand. It could benefit from more practice questions, but overall, it's a great resource for efficient studying. Highly recommend!

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