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When cross-bridges cycle, the relative positions of the thick and thin filaments change. Match the following sarcomere characteristics as becoming greater, less, or staying the same as a result of sarcomere shortening.  

As a graduate teaching assistant for your physiology class, you are required to provide grade for the following examples of student work regarding receptors and provide a justification for the assigned grade. No two answers can have the same grade assigned.   1. Postynaptic membranes receive both excitatory impulses (which increase the likelihood of threshold), and inhibitory impulses (which decrease the likelihood of threshold). Excitatory temporal summation results from multiple action potentials in a presynaptic neuron causing sustained neurotransmitter release that results in ligand-gated Na+Na channels opening in the postsynaptic membrane [q1].  Justification of the grade [q4]   2. Synaptic integration refers to the fact that a multitude of graded synaptic impulses are necessary to eventually summate and produce action potentials. The combination of excitatory (temporal) and inhibitory (spatial) influences acting at any time will influence the likelihood of the axon hillock reaching threshold, voltage-gated Na+ Na+ channels being opened and action potential generation. [q2] Justification of the grade [q5]   3. Net postsynaptic neuronal influence determines whether or not a presynpatic neuron reaches threshold and generates an action potential. Membrane potential movement towards greater negatives are excitatory. For example, stimuli resulting in negative ion efflux or positive ions influx moves membrane potential away from threshold and can be referred to as temporal summation [q3] Justification of the grade [q6]

Compartments A and B are separated by a membrane that is permeable to K+K+ but not to Na+Na+ or Cl−Cl-. At time zero, a solution of KCl is poured into compartment A and an equally concentrated solution of NaCl is poured into compartment B. Which would be true once equilibrium is reached?

Which of the following is TRUE about the concentration gradient of Na+ in a neuron at rest?

Classify each of the following statements as being descriptive of graded potentials or action potentials.

Which is TRUE about the resting membrane potential?

Match the terms on the left to their definitions on the right to demonstrate your understanding of processes associated with changes in membrane potential.

Upload all your work and calculations to Final Exam Extra & Partial Credit assignment after submitting this exam

MicroChef is among the pioneering microwave ovens in the market. Initially, the acceptance rate of MicroChef ovens was sluggish. The acceptance rate saw a significant surge as consumers gained greater awareness and understanding of microwave technology, and with the introduction of more products compatible with this technology into the market. The likely diffusion pattern for this product is

Please select ALL the statements related to resistance that are True.