1.Cells communicate in ways that resemble human communication. Decide which of the following forms of human communication are analogous to autocrine, paracrine, exocrine, and synaptic signaling by cells. Explain why (describe why is the comparison valid)
A.A telephone conversation
B.Talking to people at a cocktail party
C.A radio announcement
D.Talking to yourself

2.What two major roles does ATP hydrolysis play in muscle contraction?
3.What is Bidirectional signaling? What process is it important for? How do ephrins and ephrine receptors mediate it?