ASCI 112 Study Guide - Quiz Guide: Glut4, Diabetes Mellitus Type 1, Pineal Gland
Document Summary
Animals have two systems of internal communication and regulation. Collectively include all the animals hormone-secreting cells. Homeostasis: physiological condition of stable/constant internal environment. Organisms control internal environments efficient functioning of complex processes of metabolism. All cells, tissues, organs and systems must function together to maintain homeostasis. Negative feedback: a regulatory mechanism in which a stimulus" causes an opposite output" in order to maintain an ideal level of whatever is being regulated. Humoral stimulus-circulatory system: capillary blood contains low concentration of ca2+, which stimulates secretion of parathyroid hormone (pth) by parathyroid glands. Neural stimulus-nervous system: preganglionic sympathetic fibers stimulate adrenal medulla cells , to secrete catecholamines (epinephrine and norepinephrine) Hormonal stimulus-endocrine system: the hypothalamus secretes hormones that , stimulate the anterior pituitary gland to secrete hormones that , stimulate other endocrine glands to secrete hormones. Hormones are a type of signaling molecule that are transported in the circulatory system to target distant organs to regulate physiology and behavior.
