Leg Presses. As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. When you push the platform, you compress the springs. You do 80.0 J of work when you compress the springs 0.200 m from their uncompressed length. (a) What magnitude of force must you apply to hold the platform in this position? (b) How much additional work must you do to move the platform 0.200 m farther, and what maximum force must you apply?
Block 3 Lecture 1 - Graded Potentials & Action Potentials 1. Identify the functional regions of a neuron and describe how they facilitate neuronal communication Receptive region - dendrites and cell body - binding of neurotransmitters, generating graded potential Impulsive-generating Region - axon hillock - summation of graded potentials, inition of action potential Conducting Region - Axon propagation of action potentials Secretory Regions - Axon terminals - release neurotransmitters 2. Identify where specific ion channels are located on a neurons Entire membrane - maintains resting membrane potential K+ leak channels (lots) Na+leak channels Na+/K+ pumps Receptive Segment - generates graded potentials - chemical-
