CH. 45 Gregg bio 1201

_____ are chemical signals that are secreted into the circulatory system and communicate regulatory messages within the body

• Endocrine molecules

• Molecules

• Animal hormones

• Plant hormones

Where do hormones go?

• only to one organ at a time

• all over

• into cells even if they don't have a receptor

• to every organ but not the brain

is a network of specialized cells—neurons—that transmit signals along dedicated pathways

• endocrine system

• nervous system

How is a signaling pathway triggered?

• the nervous system sends electrical signals that kickstart it

• Because the brain said so

• Hormones and other signaling molecules bind to target receptors, triggering specific response pathways

• Molecules like water bind to the cells that need water to start the pathway

What is the two criteria that communication between animal cells through secreted signals can be classified as

• The type of secreting cell

• The speed it takes for the signal to reach its target

• The route taken by the signal in reaching its target

• The shape of the signal and the shape of the cell receiving the signal

Endocrine signaling ...

• the target cells lie near the secreting cells; the target cell is also the secreting cell

• Hormones secreted into extracellular fluids by endocrine cells reach their targets via the bloodstream

• neurons form specialized junctions with target cells, called synapses

Paracrine and Autocrine Signaling...

• the target cells lie near the secreting cells; the target cell is also the secreting cell

• Hormones secreted into extracellular fluids by endocrine cells reach their targets via the bloodstream

• neurons form specialized junctions with target cells, called synapses

Synaptic and Neuroendocrine Signaling...

• the target cells lie near the secreting cells; the target cell is also the secreting cell

• Hormones secreted into extracellular fluids by endocrine cells reach their targets via the bloodstream

• neurons form specialized junctions with target cells, called synapses

What is an example of a local regulator that also functions as a neurotransmitter

• H20

• NO

• O2

• CH3

What are the 2 classes of hormones?

_____ and ____

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