Ch. 23 Endocrine - tortora

Ch. 23 Endocrine - tortora - Endocrine System 1 Glands...

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1 Endocrine System
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2 Glands Endocrine system network of glands that secrete hormones Regulatory molecules that travel in the bloodstream affect the function of target cells maintains homeostasis Endocrine glands Local hormones Paracrine secretions Autocrine secretions Exocrine glands secrete through tubes or ducts
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3 Endocrine System Nervous System
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6 Hormones Hormones have powerful effects in very low concentrations. The body’s has ~50 hormones and only a few types of cells. Hormone affects only certain target cells. Hormones bind to specific protein receptors.
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7 Hormones Help regulate: Chemical comp. and volume of internal environment (interstital fluid) Metabolism and energy balance Contraction of smooth and cardiac mm. Glandular secretions Some immune system activities Control growth and development Regulate operation of reproductive systems Help establish circadian rhythms
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8 Hypothalamus “Master” endocrine gland Inferior to thalamus Major integrating link between nervous and endocrine system
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9 Pituitary Gland Lies in hypophyseal fossa in sella turcica of sphenoid bone Attaches to hypothalamus via infundibulum 2 portions Anterior – 75% Posterior – 25%
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10 Adenohypophysis (anterior pituitary) Parts distalis Pars tuberalis Pars intermedia Atrophies during fetal development Neurohypophysis (posterior pituitary) Pars nervosa infundibulum Pituitary Gland
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12 Pituitary Gland Neurosecretory cells
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This note was uploaded on 01/30/2011 for the course BIO 305 taught by Professor Fg during the Spring '10 term at Ohio Northern University.

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Ch. 23 Endocrine - tortora - Endocrine System 1 Glands...

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