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The Endocrine System
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Anatomy
Undergraduate 2
05/02/2010

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Term
Endocrine System
Definition
Communicative system that uses hormones as messengers. Slower, but longer lasting, responses than the nervous system.
Term
Adrenal Medulla
Definition
Endocrine Gland. Triggered by sympathetic neurons to release hormones (norepinephrine and epinephrine) into the bloodstream.
Term
What hormones are secreted into the bloodstream by the Adrenal Medulla?
Definition
Norepinephrine and Epinephrine
Term
Gland
Definition
A group of cells which secrete a product
Term
Endocrine Gland
Definition
Secretes hormones into the bloodstream or lymphs. No ducts.
Term
Exocrine Gland
Definition
Has ducts. Secretes substances either on the body's surface or into a body cavity. Made up of glandular epithelium.
Term
Which gland (endocrine or exocrine) has ducts?
Definition
Exocrine (like tear ducts or sweat ducts)
Term
Hormones
Definition
Secreted by the endocrine glands to trigger activity in their target cells.
Term
Two types of hormones
Definition
1. Amino-acid or peptide hormones.
2. Steroid
Term
Amino-acid or peptide hormones
Definition
made up of modified amino-acids, proteins, or peptides. Most common types
Term
Steroids
Definition
Synthesized from cholesterol.
Term
General characteristics of the pituitary gland
Definition
1. Located beneath the hypothalmus
2. Has two lobes: posterior and anterior
Term
Posterior Pituitary Lobe
Definition
Hangs from a downward projection of the hypothalmus. Holds Oxytocin and ADH in its axon terminals.
Term
Via what are the hormones oxytocin and ADH transported to the posterior pituitary lobe?
Definition
Hypothalamic-hypophyseal tract
Term
Oxytocin
Definition
Stimulates both male and female arousal. Stimulates uterine contraction during childbirth and milk release in breastfeeding.
Term
ADH
Definition
Antidiuretic Hormone - prevents extreme release of water in urine when dehydrated.
Term
Diuresis
Definition
Loss of water in urine (prevented by ADH)
Term
A lack of ADH causes what type of diabetes?
Definition
Diabetes Insipidus
Term
List the Anterior Pituitary Hormones
Definition
1. Growth Hormone (GH)
2. Thyroid-Stimulating Hormone (TSH)
3. Adenocorticotropic Hormone (ACTH)
4. Gonadotropins: Follicle-Stimulating Hormone (FSH) and Luteinizing Hormones (LH)
5. Prolactin (PRL)
Term
Growth Hormone
Definition
1. Target: all body cells, but especially the bone and muscle cells.

2. Function: Stimulate growth; lengthen bones in childhood
Term
Thyroid-Stimulating Hormone
Definition
1. Target: Thyroid Gland

2. Function: Stimulate proper activities in the thyroid gland, including proper secretion.
Term
Adenocorticotropic Hormone
Definition
1. Target: Adrenal Glands

2. Function: Stimulates proper secretion of coricosteroid hormones
Term
Gonadotropins: Follicle-Stimulating Hormones and Luteinizing Hormones
Definition
1. Target: Gonads (ovaries and testes)

2. Function: stimulate creation and secretion of sex cells and hormones, respectively
Term
Prolactins
Definition
1. Target: Breasts

2. Function: Produce milk. (Unlike the posterior pituitary hormone, Oxytocin, which stimulates breast-milk secretion)
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