Ecology and physiology of freeze tolerance in the wood frog Rana sylvatica

What takes place at an ecological and physiological level during the freezing and thawing process of the wood frog?

Action potential in heart muscles and skeletal muscle differs in its mechanism.

Explain the difference between action potential of cardiac muscle, compared with skeletal muscle.

Adaptation of the respiratory system to flight in birds(Aves)

I am doing a seminar on the adaptation of the bird respiratory system to flight, but I am having some trouble finding journals that are useful to me. I need to find a minimum of 3 primary resources. I was just wondering if someone could help me find some.

Second messenger system

If the activity of phosphodiesterase was blocked, how would a cell be affected if it normally responded to hormonal stimulation through a second messenger system? Be specific.

Why is blood pressure higher after sweating?

You are sitting outside on a hot summer day sweating profusely. You reason that your blood pressure will be low because of the fluid loss you are experiencing by sweating. You are surprised to learn that your pressure is actually high. Why is this the case? Be detailed.