Lab+11+-+Urinary+_+Endocrine

Lab+11+-+Urinary+_+Endocrine - Lab 11: Endocrine and...

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Lab 11: Endocrine and Reproductive Systems
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Endocrine System System of coordinated organs that is involved with the production and release of extracellular signaling molecules (= hormones ) Glands usually composed of hormone-secreting epithelial cells, but also neurons, muscle cells, fibroblast-like cells Richly supplied by blood and lymph vessels Endocrine glands generally have no ducts and secrete hormones directly into bloodstream
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Endocrine System Purely Endocrine Organs Pituitary gland Pineal gland/body Thyroid Parathyroid Adrenal glands Organs w/ Endocrine Cells Pancreas Thymus Gonads Brain (hypothalamus) Heart Placenta Gastrointestinal tract Kidneys Skin
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Sits in sella turcica of sphenoid bone Pituitary Gland (Hypophysis) Infundibulum = stalk that connects pituitary to brain
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Two main parts of the pituitary gland Adenohypophysi s (anterior pituitary) Neurohypophysis (posterior pituitary) Pars intermedia (part of adenohypophysis)
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A P anterior pituitary posterior pituitary Pituitary Gland
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Adenohypophysis (Anterior Pituitary) Densely cellular glandular tissue Converts hormone precursors from the hypothalamus into hormones that it then secretes
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Know these hormones
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Posterior Pituitary Hormones Hormones formed in the hypothalamus travel down axons to posterior pituitary for storage ADH increases water resorption in kidneys to regulate plasma osmolarity causes vasoconstriction to increase blood pressure Oxytocin stimulates contraction of smooth muscle of uterus during labor stimulates mammary gland for milk secretion
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Anterior pituitary Posterior pituitary
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Pineal Gland The pineal gland secretes melatonin, which regulates Circadian rhythms Pineal gland
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Thyroid Gland Thyroid gland on trachea inferior to larynx two lobes connected in front
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Thyroid Gland, 25x
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Parafollicular cells secrete calcitonin Follicular cells secrete thyroid hormone Colloid stores TH precursor follicle
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Thyroid and parathyroid gland position esophagus trachea thyroid gland neck MM parathyroid gland
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Parathyroid Glands Thyroid gland Parathyroid glands Posterior side of thyroid gland Chief cells secrete parathyroid hormone (PTH) PTH raises blood Ca 2+ levels
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Chief cells secrete PTH Chief cells stain darkly
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The adrenal gland is really two glands The cortex secretes several steroid hormones arranged into three zones The
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Lab+11+-+Urinary+_+Endocrine - Lab 11: Endocrine and...

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