Class Notes (806,517)
Canada (492,271)
Biology (2,161)
BIOL 273 (91)

Chapter 11 textbook material only chapter 11 textbook material only

6 Pages
Unlock Document

University of Waterloo
BIOL 273
Katherine Wood

Unit 2NeurophysiologyChapter 11 Efferent Division Autonomic and Somatic Motor Control THE AUTONOMIC DIVISION Autonomic Reflexes Are Important for HomeostasisMaintaining homeostasis o Sensory information from somatosensory and visceral receptors go to homeostatic control centres in the hypothalamus pons and medullaMonitor and regulate important functions like blood pressureHypothalamuscontains neurons that act as sensory neurons ex osmoreceptors o Motor neuron output from hypothalamus and brain stem create autonomic responses endocrine responses and behavioural responses integrated in brain centres responsible for motivated behaviours and control of movementEmotions that create autonomic outputo Sensory information integrated in the cerebral cortex and limbic systemSome autonomic reflexes are capable of taking place without input from the brain o Spinal reflexesurination defecation erectionBodily functions that can be influenced by descending pathways from the brain but do not require this inputEx 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 DivisionSympathetic and parasympathetic pathways display Cannons properties of homeostasis o Preservation of the fitness of the internal environment o Updown regulation by tonic control o Antagonistic control o Chemical signals with different effects in different tissuesMost organ systems under antagonistic control o One branch excitatory o One branch inhibitoryEx heart rate increase by sympathetic pathway and decreased by parasympathetic pathway o Exceptionsweat glands and smooth muscles in blood vesselsOnly sympathetic branchupdown controlSometimes two branches work together to create a common goal o Ex erectionsblood flow controlled by parasympathetic pathway and smooth muscle contractions for ejaculation is controlled by the sympathetic pathwaySometimes response depends on the neurotransmitter receptor
More Less

Related notes for BIOL 273

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.