Chapter 8 Flashcards
Hormone
Chemical, usually secreted by an endocrine gland, that is conveyed by the bloodstream and regulates target organs or tissues
Endocrine glands
Glands that secretes hormones into the bloodstream. Exocrine glands are tear, salivary, sweat (outside body)
Pheromone
Chemical signal that is released outside the body of an animal and affects members of the same species
Allomones
Chemical signal that is released outside the body of one species and affects behavior of another species
Peptide Hormone
“protein hormone” that consists of a string of amino acids.
Amine Hormone
“monoamine hormone” hormone composed of a single amino acid that has been modified into a related molecule such as melatonin or epinephrine
Steroid Hormone
Any of a class of hormones, each of which is composed of four interconnected rings of carbon atoms.
Pituitary gland
A small, complex endocrine gland located in a socket at the base of the skull. Sits right below the hypothalamus,
Pituitary stalk
Thin piece of tissue that connects the pituitary gland to the hypothalamus
Neuroendocrine cell
Neuron that releases hormones into local or systemic circulation
Posterior pituitary
rear decision of the pituitary gland (does not produce hormones) rather diffuses them into the blood stream
Oxytocin
Hormone, released from posterior pituitary, triggers milk letdown in nursing and is also associated with a variety of complex behaviors
Vasopressin
“Arginine vasopressin” peptide hormone from the posterior pituitary that promotes water conservation and increases blood pressure
Negative Feedback
output of hormone feeds back to inhibit the drive for more of that same hormone
Anterior Pituitary Gland
Front division of pituitary gland, secretes tropic hormones
Tropic Hormone
Any class of anterior pituitary hormones that affect the secretion of hormones by other endocrine glands
Releasing hormone
any of a class of hormones, produced in the hypothalamus, that traverse the hypothalamic pituitary portal system to control the pituitary’s release of the tropic hormones
Median Eminence
Midline feature on the base of the brain that marks that point at which the pituitary stalk exits the hypothalamus to connect to the pituitary. Contains elements of the hypothalamic pituitary portal system.
Hypothalamic-pituitary portal system
Elaborate bed of blood vessels leading from the hypothalamus to the anterior pituitary
Growth Hormone (GH)
“somatotropin or somatotropic hormone” A tropic hormone that is secreted by the anterior pituitary that promotes the growth of cells and tissues
Gonad
Any of the sexual organs that produce gametes for reproduction (ovaries/testes)