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Unformatted text preview: AP-1 Lab 12 Lab ReportName: _Section: ______DL3_____Lab Report: Exercise 12: Reflex and Sensory PhysiologyPurpose: This lab is geared towards testing our reflexes and sensory physiology. We use these everyday and rarely do we understand how much they contribute to our ability to function normally. A reflex is a rapid, involuntary motor response to stimuli. We will be conducting several experiments to test our reflexes throughout this lab. There are two types of reflexes however, the autonomic reflex, which controls reflexes we do not have control over and the somatic reflexes which are controlled by the somatic nervous system and involves the stimulation of skeletal muscles. Our senses tell us whats going on around us. They give our brain constant information about our world around us and help us make decisions about how we should react. In this lab we will explore our sense (5) and how they function. The safety concerns are similar to the cat and brain dissection labs. Where your safety goggles, mask, and gloves and be careful with the sharp objects involved.Activity 1: Stretch ReflexesQUESTIONS:A.Which muscles contracted with the patellar reflex?The sharp tap on the tendon slightly stretches the quadriceps, the complex of muscles at the front of the upper leg. In reaction these muscles contract, and the contraction tends to straighten the leg in a kicking motion.B.Which nerves carried the stimulus to the spinal cord?This stimulates stretch sensory receptors that trigger an afferent impulse in a sensory nerve fiber of the femoral nerve leading to the lumbar region of the spinal cord.C.Is the patellar reflex response greater than or less than the first response?The knee jerk may be reinforced by a second stimulus, such as a loud noise when the noise is appropriately timed with respect to the tapping of the tendon.D.What can you conclude about the effect of mental distraction on reflex activity?A decrease in mental excitement is associated with a decrease in the reflex.1E.Is the patellar reflex more or less vigorous after exercise?The strength of the tap required to evoke the reflex is higher after physical or mental work.F.Do you think muscle function or nervous system activity caused the changes you observed after exercise? Explain your reasoning.Due to muscle fatigue and nervous system response there is a decrease in response speed. This is because you body needs time to recover and rest after exercise....
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