Match each signal to how far it goes

Exercise and reference answers

Matching pairs

1. Left

   Paracrine signal

   Right

   Acts on cells that are close by

2. Left

   Endocrine signal

   Right

   Travels the bloodstream to distant cells

3. Left

   Autocrine signal

   Right

   Is received by the cell that sent it

4. Left

   Gap junction

   Right

   Lets small molecules pass between cells

5. Left

   Neurotransmitter

   Right

   Carries a signal across a chemical synapse

Instructions

Tap a signaling type, then tap the route its ligand takes to reach the target cell.

Explanation