Chapter 7.docx - Chapter 7 Cell Communication and...

This preview shows page 1 out of 5 pages.

Chapter 7: Cell Communication and Multicellularity In prairie voles, oxytocin and vasopressin released by brain cells during mating bind to other brain cells and trigger life- long bonding and extensive care of offspring. The experiments showing involvement of oxytocin, activities such as - Massages - Hugs - Sexual activities Release oxytocin, resulting in positive behaviors Chemical signals- that target cells can be classified according to signal source and mode of signal delivery - A signal transduction pathway includes a signal, a receptor, and a response - Not all cells respond to a signal because some lack the ability to receive the signal All cell process information from the environment The information can be a chemical or a physical stimulus, such as light Signals can come from outside the organism or from neighboring cells Chemical cells signals: - Autocrine: signals affect the cells that made them ( same cell) - Juxtacrine: signals affect only adjacent cells - Paracrine: signals affect nearby cells - Hormones: travel to distant cells, usually via the circulatory system A signal molecule can diffuse to and act on the cell the produces it, an adjacent cell, or nearby cell. Hormones are chemical signals that act on distant cells and must be transported by the organism’s circulatory system. To respond to a signal, a cell must have a specific receptor that can detect it. A signal transduction pathway is the sequence of events that lead to a cells response to a signal. The signal causes a receptor protein to change conformation (shape). Expression of one or more genes is turned on or off (transcription). A signal transduction pathway involves a signal, a receptor, and responses.
Image of page 1
You've reached the end of this preview.
  • Fall '16
  • Dr.Dyer

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern