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Name: Date: Sec 3 Sci&Tec Ms. Sulik Nervous System III – Reflexes and Peripheral Nervous System (PNS) Knee-jerk test Before-During-After Before During After 1) Hit the tendon with the hammer a. Receive a message This is the _ 2) Signal is sent a. Message is 3) Leg kicks out a. Knee-jerk _ occurs 1 Name: Date: Sec 3 Sci&Tec Ms. Sulik Reflexes Reflex: a _ and _ Stimulus: Anything that can be reaction to a stimulus _ by a living organism and can Reflex arc: The pathway taken by a _ during a reflex. Basically a series of neurons What’s happening in our bodies? General process 1) We receive a stimulus Knee-jerk example The stimulus is: _ 2) A nerve impulse message is transferred Message is transferred along neurons 3) This message is received and decoded Message is received and decoded by the 4) A new message is sent in return 5) There is a reaction _ Message is transferred along neurons The reaction is: _ CNS and PNS Central Nervous System (CNS) is composed of Spinal cord: _ and _. _ in the nervous system that _ from the various parts of the body to the brain. It is like a large communication cable. The spinal cord is also known as the _ centre Peripheral Nervous System (PNS) _ different parts of the body to the . Sensory receptors: The structures that pick up into _ and transform them . Transfer impulse to nerves 2 Name: Date: Sec 3 Sci&Tec Ms. Sulik Types of neurons Sensory neurons - Transmit information from the to the Motor neurons - Transmit impulses from to in order to produce movement Movement can be voluntary or involuntary Interneurons - Neurons that between other neurons Neither sensory nor motor Reflex Pathway 1) The impulses. pick up a stimulus and change it into electrical 2) The or afferent nerve carries the message to the CNS. 3) The (found in the grey matter of the spinal cord) received the information and interprets it. It then sends out a response signal. 4) The muscles and makes it react. This reaction can be or efferent nerve transmits the signal to the or 3 Name: Date: Sec 3 Sci&Tec Ms. Sulik Response Time Test General process 1) We receive a stimulus Ruler Drop Test The stimulus is: _ 2) A nerve impulse message is transferred Message is transferred along neurons 3) This message is received and decoded Message is received and decoded by the 4) A new message is sent in return 5) There is a reaction _ Message is transferred along neurons The reaction is: _ Difference between knee-jerk and ruler drop test: Knee-jerk – reflex Ruler test – movement 4