BIOL273 Lecture : Chapter 11 textbook material only chapter 11 textbook material only
16 Oct 2011
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Chapter 11: efferent division: autonomic and somatic motor control. Maintaining homeostasis: sensory information from somatosensory and visceral receptors go to homeostatic control centres in the hypothalamus, pons, and medulla. Monitor and regulate important functions like blood pressure. Emotions that create autonomic output: sensory information integrated in the cerebral cortex and limbic system. Some autonomic reflexes are capable of taking place without input from the brain: spinal reflexes urination, defecation, erection. Bodily functions that can be influenced by descending pathways from the brain, but do not require this input. Ex. people with spinal cord injuries can still do these bodily functions, but may lose control of them or the ability to sense them. Antagonistic control is a hallmark of the autonomic division. Sympathetic and parasympathetic pathways display cannons properties of homeostasis: preservation of the fitness of the internal environment, up down regulation by tonic control, antagonistic control, chemical signals with different effects in different tissues.
