h phys spring '10--exam 3--answer key

h phys spring '10--exam 3--answer key - TRASK Name Zool...

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TRASK Name: 1 Zool 2200: Human Physiology Exam 3 3/26/10 Section I: Multiple Choice. Answer each of the following questions by filling in the circle on your answer sheet that corresponds with the BEST answer. (39 points total). 1. In general, which of the following would you expect to be the shortest? a.) A pre-ganglionic sympathetic neuron. b.) A pre-ganglionic parasympathetic neuron. c.) A post-ganglionic sympathetic neuron. d.) A somatic neuron. 2. Parasympathetic ganglia are located: a.) In a chain parallel to the spinal cord. b.) In the dorsal roots of spinal nerves. c.) Near the target tissue they innervate. d.) In the brain. 3. Cholinergic receptors are responsible for both the ‘fight or flight’ and the ‘rest and digest’ responses. a.) True. b.) False. 4. Which of the following types of receptors is/are found on the post-synaptic target cell in the parasympathetic nervous system? a.) cholinergic. b.) adrenergic. c.) muscarinic. d.) nicotinic. e.) Both a.) and c.). f.) Both a.) and d.). g.) a.), b.), and d.). h.) a.) c.), and d.). 5. If a target cell’s receptor is adrenergic, the neurons releasing neurotransmiiter onto the cell must be: a.) A somatic motor neuron. b.) An autonomic pre-ganglionic neuron. c.) A sympathetic post-ganglionic neuron. d.) A parasympathetic post-ganglionic neuron. e.) Both b.) and c.)
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2 6. Which of the following might result in the opening of potassium ion channels in a target cell membrane following signaling from the autonomic nervous system? a.) Acetylcholine. b.) Norepinephrine. c.) Nicotine. d.) Diacylglycerol. e.) a.) and b.) f.) a.) and c.) 7. If an inhibitor of acetylcholinesterase is added to a neuromuscular junction, then the postsynaptic membrane will: a.) Be depolarized by action potentials more frequently. b.) Be depolarized longer with each action potential. c.) Be resistant to depolarization. d.) Spontaneously depolarize. 8. Signals can be sent in only one direction through synapses such as the neuromuscular junction. Which of the following best explains unidirectional signaling at synapses between a neuron and a skeletal muscle cell? a.) Neurotransmitter is always degraded by the postsynaptic cell. b.) Only the postsynaptic cell has neurotransmitter receptors. c.) Axons can propagate action potentials in only one direction. d.) Only the postsynaptic cell has a resting membrane potential. 9. Somatic motor pathways are: a.) Always excitatory. b.) Composed of a single neuron. c.) Synapse with skeletal muscle cells. d.) All of the above. 10. Calcium ions in skeletal muscle: a.) Are necessary for myosin-actin crossbinding. b.) Bind to tropomyosin, which exposes active binding sites on actin. c.) Bind to troponin, exposing active binding sites on myosin. d.)
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h phys spring '10--exam 3--answer key - TRASK Name Zool...

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