External environment changes such as temperature, pressure, osmotic pressure. or contact with bacteria and toxins Internal environment Nervous system Endocrine System Emergency response reaction Interaction Interaction Homeostasis of the intemal environment Short-term effects ong-ter rmi effects Biological defense Endocrine Immune system Interact system
Endocrine System
Proferation of cells and their downgrowth into the subjace connective tssue exocrine endocrine Exocrine gland Cords of cells Folacular endocine getty ma gudoadddad Disappearance Endocrine organ Exocrine organ of duct colis No ducts ducts follicle, cord, net acin like arranged Glandular epi cells
exocrine endocrine Endocrine organ No ducts Exocrine organ ducts follicle, cord, net acini like arranged cells Glandular epi
Endocrine vs Neuronal secretion ● Extracellular siana YE Target sites on same cell AUTOCRINE SIGNALING Endocrine cell Adjacent target cell PARACRINE SIGNALING Blood vessel Hormone secretion into by endocrine glan Ways of Secretion Distant target cells OCRINE SIGNALING
Ways of Secretion
Glands can be one of three types Exocrine -release secretions that are carried within 0 a duct or tube -sweat glands, salivary glands, sebaceous glands Endocrine release secretions directly into the blood thyroid gland, adrenal gland, anterior pituitary gland Heterocrine contain both exocrine and endocrine brms components- pancreas, testis
Glands can be one of three types Exocrine – release secretions that are carried within a duct or tube – sweat glands, salivary glands, sebaceous glands Endocrine – release secretions directly into the blood – thyroid gland, adrenal gland, anterior pituitary gland Heterocrine – contain both exocrine and endocrine components – pancreas, testis
Steroid-secreting cells Nitrogen-secreting cel SER; lipid droplet; mitochrondria RER; Golgi complex secreting granules:
Steroid-secreting cells SER; lipid droplet; mitochrondria Nitrogen-secreting cell RER; Golgi complex; secreting granules;