What is the primary cell wall composed of?
cellulose
Some plant cells have a secondary cell wall composed of a thick layer of cellulose in combination with _____ to add strength
lignin
Neurotransmitters involved in the transfer of information within the nervous system
synaptic
epinephrine and serration are examples of what form of cell signaling?
synaptic
Hormones are produced by one organ/tissue of the body to influence function of another organ/tissue
endocrine
sex hormones and insulin are examples of what type of cell signaling?
endocrine
molecules released over short distances
paracrine
blood clotting and tissue repair signals are what type of cell signal?
paracrine
contact between receptors of neighboring cells though channels
direct contact
release of chemicals by own cell to influence its own activity
autocrine
