PSY 3006 Lecture Notes - Lecture 3: Sinoatrial Node, Autonomic Nervous System, Blood Sugar
31 Oct 2018
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Pet = measures changes in the uptake of unstable radioactive labeled isotopes. Negative feedback- a disturbance on a system induces mechanisms to return the system back to its original state or set point (always tries to bring the system back to normal) Example: when blood sugar rises, receports in the pancreas sense a change and secrete insulin to lowen blood sugar levels. Once blood sugar levels erach nomeostasis, the pancreas stop releasing insulin. Reflux in the heart: frank-starling mechanism regulates the force of teh heartbeat based on the amount of blood. Wutgiout the brain input, these two mechanisms will keep the heart pumping at 110 beats/min. But the brain input via the endocrine and autonomic systems is needed to adjust heartrate to changing conditions (example: standing up from a heated position) We still need the brain input via the. Levels of regulation: ans (autonomic nervous system) Preganglionic neuron (cell bodies in the thoracic and.
