Cell Communication Flashcards
How does an electrical signal work? ( Short answer)
Changes in cell membrane potential
How does a chemical signal work? (Short answer)
Molecules secreted by cells into extracellular fluid
chemicals used for Local signaling are sent by which types of systems?
autocrine and paracrine
Chemicals used for distant targets are sent out by which system?
The endocrine system
how are electrical signals transported in the body?
By nerve cells
How are chemical signals transported in the body?
They transported in the blood
What’s a gap junctions?
They allowed direct cytoplasmic transfer of electrical and chemical signals between adjacent cells
What are Gap junctions composed of?
Six membrane spanning proteins called connexions
Describe contact dependent signals
They require CAMs which are cell adhesion molecules
They need direct surface contact
To which cell does the autocrine system send signals to?
Itself
To which cells did the paracrine system send signals to
Neighboring cells
What are neurotransmitters?
Chemicals secreted by neurons that diffuse across a small Gap to target cells
Give examples of Neurohormones
Oxytocin
vasopressin
Norepinephrine
What are chemicals secreted by neurons called?
Neurocrine molecules
