Multiple Choice
An activated G protein can trigger which of the following cellular events?
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14. Cell Signaling
Overview of Signaling Molecules
Multiple Choice
Insulin released from pancreatic β cells travels through the bloodstream to act on distant target tissues such as liver, muscle, and adipose tissue; what type of cell signaling does this represent?
A
Autocrine signaling
B
Juxtacrine (contact-dependent) signaling
C
Paracrine signaling
D
Endocrine signaling
Verified step by step guidance1
Identify the source of the signaling molecule: insulin is released from pancreatic β cells.
Determine the distance the signaling molecule travels: insulin travels through the bloodstream to reach distant target tissues such as liver, muscle, and adipose tissue.
Recall the types of cell signaling based on distance: autocrine signaling acts on the same cell that releases the signal; juxtacrine signaling requires direct contact between cells; paracrine signaling acts on nearby cells; endocrine signaling involves hormones traveling through the bloodstream to distant cells.
Match the description to the correct signaling type: since insulin travels through the bloodstream to distant cells, this fits the definition of endocrine signaling.
Conclude that insulin signaling from pancreatic β cells to distant tissues is an example of endocrine signaling.
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