BIO 211 Lecture Notes - Lecture 5: Circadian Rhythm, Endocrine System, Circulatory System
4 Aug 2020
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Example: circadian rhythm, cycles every 24 hours. Body temperature is lowest in the early morning and peaks in the late afternoon and early evening. Older people have more difficulty regulating body temp. Cortisol is lowest during sleep and peaks shortly after awakening. Plasma cortisol puts us at alert and a natural anti- inflammatory hormone. Much more of an appetite in the winter because we are producing more thyroid hormone to maintain body temperature. Thyroid hormone is the main hormone to stimulate both anabolic and catabolic reactions. Controls and coordinates bodily activities that require rapid responses. Detects and initiates reactions to changes in external environment. Secreting glands of endocrine regulate activities that require duration rather. Controls concentration of nutrients and, by adjusting kidney function, controls internal environment"s volume and electrolyte composition. Carries materials from one part of the body to another. Breaks down dietary food into smaller molecules that can be distributed to body cells.
