BIOL 1051H Chapter Notes - Chapter 1: Walter Bradford Cannon, Brainstem, Organelle
26 Mar 2018
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Organization: living things exhibit a far higher level of organization than the nonliving world around them. Cellular composition: living matter is always compartmentalized into one or more cells. Responsiveness and movement: ability for organisms to sense and react to stimuli, nerve a(cid:374)d (cid:373)us(cid:272)le (cid:272)ell"s high se(cid:374)sitivity to e(cid:374)viro(cid:374)(cid:373)e(cid:374)tal sti(cid:373)uli, rapid tra(cid:374)s(cid:373)issio(cid:374) of information, and quick reactions. Homeostasis: organisms maintain relatively stable internal conditions (internal stability) Evolution: all living things exhibit genetic change from generation to generation and therefore evolve, this occurs because of mutations (changes in dna structure) A person who has shown no brain waves for 24 hours, and has no reflexes, respiration, or heartbeat other than what is provided by artificial life support, can be declared legally dead. Physiological variables differ with sex, age, weight, diet, degree of physical activity, genetics, environment, etc. Homeostasis: the (cid:271)ody"s a(cid:271)ility to dete(cid:272)t (cid:272)ha(cid:374)ge, a(cid:272)tivate (cid:373)e(cid:272)ha(cid:374)is(cid:373)s that oppose it, a(cid:374)d thereby maintain relatively stable internal conditions.
