1. Cells communicate in ways that resemble human communication. Decide which of the following forms of human communication are analogous to autocrine, paracrine, endocrine, and synaptic signaling by cells. A. A telephone conversation B. Talking to people at a party C. A radio announcement D. Talking to yourself Choose one out of autocrine, paracrine, endocrine, direct, or synaptic signaling and discuss the process by which this occurs. 2. Explain the reason why Ca2+, IP3, and cAMP are called second messengers? In what ways are their mechanisms of action similar? In what ways are they different? 3. Staphylococcus aureus bacteria is the main cause of hospital-acquired infections. Cell-cell communication enables it to form a biofilm inside a hospital patient's catheter. What advantage might biofilm production confer on the S. aureus inside the catheter