Endocrine System Flashcards
two systems that communicate with neurotransmitters
and hormones
- nervous system
- endocrine system
glands, tissues, and cells that secrete
hormones
endocrine system
the study of this system and the diagnosis and treatment of its disorders
Endocrinology
Have ducts carry secretion to an epithelial surface of the mucosa of the digestive tract: “external secretions”
Exocrine glands
Chemical messengers that travel in the bloodstream to other tissues and organs
Hormones
Released from neurons to travel across synaptic cleft to second cell
Neurotransmitters
Pores in cell membrane allow signaling molecules, nutrients, and electrolytes to move from cell to cell
Gap Junctions
Secreted into tissue fluids to affect nearby cells
Paracrine (local) hormones
No ducts, contain dense, fenestrated capillary networks that allow easy uptake of hormones into the bloodstream
Endocrine glands
The hypothalamus is shaped like a flattened funnel
Pituitary Gland
The pituitary gland is suspended from the hypothalamus by a stalk
infundibulum
Arises from hypophyseal pouch (an outgrowth of the pharynx)
Adenohypophysis (anterior pituitary)
Downgrowth from brain
Neurohypophysis (posterior pituitary)
constitutes the posterior one-quarter of the pituitary
Neurohypophysis
Two other hypothalamic hormones are:
- oxytocin (OT)
- antidiuretic hormone (ADH)