PHYSCI 5 Midterm: Chapter3Hormones

• School: UCLA
• Department: Physiological Science
• Course: PHYSCI 5
• Professor: Esdin Joseph

Document Summary

Hormones: chemical messengers in the endocrine system that facilitate communication and coordination needed to integrate organ functions; maintain homeostasis. Hormones are mainly released by primary endocrine glands or mixed endocrine glands. Primary endocrine glands, which function to release hormones, include the pituitary gland, thyroid gland, parathyroid glands, adrenal gland, gonads, and thymus. Mixed endocrine glands, having systematic functions, include the heart, liver, stomach, small intestine, skin, and kidney. Secretes 9 hormones regulation through hypothalamus-pituitary-specific hormone axis: secretes many of the hormones responsible for regulating all the other endocrine glands, anterior pituitary, it synthesizes and releases its own hormones, somatotrophs (release growth hormone) Three kinds of mechanisms involved in the regulation of glands releasing hormones: Humoral (measurement): the hormone is triggered to be released in response to changing levels of ions or molecules in the circulation. Example: insulin released from beta-cells if glucose level is high and glucagon released from alpha-cells if glucose level is low.