NPB 101 SAMPLE EXAM QUESTIONS

NPB 101 SAMPLE EXAM QUESTIONS - NPB 101 SAMPLE EXAM...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
NPB 101 SAMPLE EXAM QUESTIONS 1. Homeostasis is: a. an underlying principle of physiology. b. a dynamic steady-state. c. maintained by the process of regulation. d. only a and b are correct. e. a, b and c are all correct. 2. The Na + /K + ATPase pump of the axon of a neuron: a. is a lipid molecule in the membrane. b. pumps 2 Na + ions for every 2 K + ions. c. establishes the ion gradients for Na + and K + d. only a and b are correct. e. a, b and c are all correct. 3. The Nernst potential is: a. the membrane potential of the cell. b. a log relationship of the ratio of the concentration of an ion outside relative to inside the cell. c. determined by the ion channel leaks for sodium and potassium. d. only a and b are correct. e. a, b and c are all correct. 4. Ion permeability (P i ) is: a. determined by the availability of ion channels for ion “i” in the membrane. b. may be altered by various stimuli, including mechanical, chemical and electrical stimuli. c. directly related to the electrochemical equilibrium for ion “i”. d. only a and b are correct. e. a, b and c are all correct. 5. If a neuron were experimentally stimulated at both ends simultaneously: a. the action potentials would pass in the middle and travel to the opposite ends. b. the action potentials would meet in the middle and then be conducted back to their starting positions. c. the action potentials would stop as they met in the middle. d. the stronger of the two action potentials would override the weaker action potential. e. summation would occur when the action potentials met in the middle, resulting in a larger action potential. 6. An action potential conducted down an axon requires the presence of: a. voltage-stimulated Na + channels. b. Na+/K+ ATPase electrogenic pump. c. voltage-stimulated Ca ++ channels. d. only a and b are correct.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
e. a, b and c are all correct. 7. Two adjacent axon terminals, one from neuron A, the other from neuron B, synapse on a third neuron C. The two axon terminals simultaneously release transmitter eliciting an action potential in neuron C. This is an example of: a. convergence. b. temporal summation. c. spatial summation. d. only a and b are correct. e. only a and c are correct. 8. At an excitatory synapse an action potential in the: a. postsynaptic neuron depolarizes the presynaptic membrane. b. presynaptic neuron increases the permeability of the postsynaptic membrane to Na + and K + . c. presynaptic neuron increases the permeability of the postsynaptic membrane only to K + . d. only a and b are correct. e. a, b and c are all correct. 9. Tonic receptors: a. are useful in signaling the stimulus level to the nervous system. b. are primarily proprioceptors. c. adapt rapidly.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 14

NPB 101 SAMPLE EXAM QUESTIONS - NPB 101 SAMPLE EXAM...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online