endocrine - Lecture: The Endocrine System The endocrine...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture: The Endocrine System The endocrine system is a chemical control system. It functions in conjunction with the nervous system to control the internal environment (homeostasis). I. Endocrine Glands A. Glands without ducts 1. Secrete HORMONES ("to set in motion") into the intercellular spaces and they pass directly into the blood and is then distributed to all parts of the body via the circulatory system. 2. Hormones - chemical secretions of the endocrine glands. a. chemical types - 1). proteins and polypeptides (endodermal origin) 2). Amines (endodermal origin) 3). steroid (mesodermal origin) 3. Hormones - act to maintain homeostasis by altering cellular activity. 4. Hormones can affect a. organ or groups of organs directly ("target organ(s)") b. other endocrine glands called "target glands" [these hormones are called tropic hormones] B. Nervous System vs. Endocrine System Nervous System Endocrine System Effects rapid & short-lasting Controls muscles & glands activities of cells: a. metabolism b. reproduction c. stress responses d. fluid-electrolyte balance e. acid-base balance f. energy balance II. Pituitary Gland - (Hypophysis) [Master Gland] A. Location 1. in Sella Turcica of sphenoid bone 2. attached to Hypothalamus by a stalk called Infundibulum B. Structure 1. Anterior lobe – [glandular part] - Adenohypophysis 2. Posterior lobe – [neural part] – Neurohypophysis 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
C. Anterior Pituitary - (Adenohypophysis) 1. Hormone secretions controlled by secretions from the hypothalamus produced by nerve cells and control the release of hormones by Endocrine glands; these hormones are called releasing factor Growth Hormone (GH) - Somatotrophic Hormone (STH) 1. Increases Growth and Maintenance of Organs by: a. stimulating protein anabolism b. promotes fat catabolism (use of fat rather than sugars for energy) 2. Abnormal Secretions of STH a. Giantism -- hypersecretion during childhood (before epiphyseal plates close) b. Acromegaly -- hypersecretion during adulthood c. Dwarfism -- hyposecretion during childhood d. Cachexia (Simmond's Disease) - hyposecretion during adulthood causes premature aging and atrophy of organs Prolactin - (Lactogenic Hormone)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/27/2010 for the course BIOL mark taught by Professor Ohysiology during the Spring '10 term at W. Florida.

Page1 / 6

endocrine - Lecture: The Endocrine System The endocrine...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online