ADH and Angiotensin

Explain in layman's terms the interconnected roles of ADH and angiotensin. PLEASE include a diagram.

blood calcium ion homeostasis

I have a question that is being asked for homework. I can find all of the information on homeostasis. I am supposed to include negative and posative feedbacks in my example. But what I can't find is how the body maintains the blood calcium ion homeostais. If I sould find out what this means, I could possibly answer my homework paper. Thank you.

Seasonal Affective Disorder and Circadian Rhythms

Explain why people in Washington State are often affected with Seasonal affective disorder in the winter using general knowledge of circadian rhythms. And, explain how can Seasonal Affected Disorder can be treated.

Divers and lung capacity

Explain why divers often hyperventilate before diving and why they don't fill their lungs to capacity before taking the plunge. List 3 physiological problems that had to be solved before submarines could operate efficiently under the ocean for long periods.

The body and altitudes

Why is it so difficult for the body to live at high altitudes? Give three ways the body adjusts to higher altitudes. Please discuss one.