Endocrine system
Human Anatomy (Gharbiya STEM High School)
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,ENDOCRINE SYSTEM
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, Endoкrine system
- An animal hormone is a chemical signal that is secreted into the extracellular
fluid, circulates in the blood or hemolymph, and communicates regulatory
messages within the body.
○ A hormone may reach all parts of the body, but only specific target cells have
the receptors that enable a response.
○ A given hormone traveling in the bloodstream elicits specific responses—
such as a change in metabolism—only from its target cells while other cells are
unaffected.
- Chemical signaling by hormones is the function of the endocrine system, one
of two basic systems for communication and regulation throughout the body.
- The other major communication and control system is the nervous system, a
network of specialized cells called neurons that transmit signals along dedicated
pathways.
- Hormones secreted by endocrine cells regulate reproduction, development,
energy metabolism, growth, and behavior.
- Because signaling by neurons can regulate the release of hormones,
the nervous and endocrine systems often overlap in function.
- Hormones convey information via the bloodstream to target cells throughout
the body.
- Other chemical signals—local regulators—transmit information to target
cells near the secreting cells.
- Pheromones carry messages to different individuals of a species.
Intercellular Communication
Communication between animal cells via secreted signals is often classified by
two criteria:
1. The type of secreting cell
2. The route taken by the signal in reaching its target.
Downloaded by ajibade adewale
Human Anatomy (Gharbiya STEM High School)
Scan to open on Studocu
Downloaded by ajibade adewale
,Studocu is not sponsored or endorsed by any college or university
Downloaded by ajibade adewale
,ENDOCRINE SYSTEM
Downloaded by ajibade adewale
, Endoкrine system
- An animal hormone is a chemical signal that is secreted into the extracellular
fluid, circulates in the blood or hemolymph, and communicates regulatory
messages within the body.
○ A hormone may reach all parts of the body, but only specific target cells have
the receptors that enable a response.
○ A given hormone traveling in the bloodstream elicits specific responses—
such as a change in metabolism—only from its target cells while other cells are
unaffected.
- Chemical signaling by hormones is the function of the endocrine system, one
of two basic systems for communication and regulation throughout the body.
- The other major communication and control system is the nervous system, a
network of specialized cells called neurons that transmit signals along dedicated
pathways.
- Hormones secreted by endocrine cells regulate reproduction, development,
energy metabolism, growth, and behavior.
- Because signaling by neurons can regulate the release of hormones,
the nervous and endocrine systems often overlap in function.
- Hormones convey information via the bloodstream to target cells throughout
the body.
- Other chemical signals—local regulators—transmit information to target
cells near the secreting cells.
- Pheromones carry messages to different individuals of a species.
Intercellular Communication
Communication between animal cells via secreted signals is often classified by
two criteria:
1. The type of secreting cell
2. The route taken by the signal in reaching its target.
Downloaded by ajibade adewale
