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The functioning of nerves and neurons in the peripheral and central nervous systems. It covers topics such as the autonomic system, neurotransmitters, reflexes, and the stretch reflex. The document also includes questions and answers related to these topics.
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Nerve Your Answer: Nerve This is a bundle of axons found in the peripheral nervous system.
This part of the autonomic system accelerates the heart beat and increases breathing rate. Your Answer:
sympathetic nervous system Sympathetic Motor (Efferent) Your Answer: motor neurons The ventral root of a nerve contains what type of neurons?
Dendrites Your Answer: dendrites This part of a neuron conducts nerve impulses towards the cell body.
The neuron pictured, below, is best described as:
True or false: Neurons do not physically touch one another. Correct! (^) True
Coorrrectct! Bipolar It has two extensions from the central cell body. Multipolar Unipolar Pseudounipolar
An afferent neuron carries information: From the central to the peripheral nervous system
Correct! (^) From the peripheral to the central nervous system Within the central nervous system Within the peripheral nervous system Correct! Only in the central nervous system Inside the synapse After the synapse Before the synapse A postsynaptic neuron would be found:
Location: Peripheral nervous system (PNS) Function: Regulation of environment of neuron cell bodies Your Answer: Satellite cells surround the body of peripheral neurons. They regulate the cell body What is the location and function of Satellite cells?
Name and describe what is occurring in the neuron cell membrane in section 4 of the d
Your Answer: Afterpolarization. During afterpolaraization, voltage drops below -70mV and then r Afterpolarization (Hyperpolarization) Potassium gates are slow to close and ther once at resting state again. At rest, a neuron plasma membrane is: Correct! (^) -70 mV
Your Answer: False. The intensity of a sensation is determined by the number of neurons stimula False There is no variation in the strength of action potentials. (It is an all-or-nothing resp Correct! The NMJ does not have a synapse. The NMJ terminates on a presynaptic motor neuron. The NMJ terminates on a muscle fiber. The NMJ terminates on neurons within the brain and spinal cord. Which of the following statements is true concerning the neuromuscular junction?
How is a message sent from one neuron to another? Your Answer:
Neurotransmitters are released from the axon terminal vesicles then omitted across a synapse to the dendrite of another neuron. There is a minute fluid-filled space, called a synapse, between the axon terminal of t and the impulse is carried. Dopamine Your Answer: Dopamine What neurotransmitter helps regulate emotional responses and muscle tone?
True or False: Action potentials travel in one direction within the same neuron. Correct! (^) True
Your Answer: A reflex arc Integration center Correct! Pulling a hand away from a hot flame is not a reflex; it is entirely voluntary. Reflexes cannot be tested because they are internal. Regulation of blood sugar by hormones is one example of a reflex. Reflexes only involve the brainstem or higher levels of processing. Which of the following statements is true about reflexes?
What is true about the stretch reflex? Stretch reflexes help to increase the stretch on a muscle. The patellar reflex tests the stretch reflex of the patella. Correct! (^) The muscle spindle detects stretch within the muscle. The effect of the motor signal is to relax a muscle.
Correct! (^) F. B&C E. A&D D. The effect of the reflex is to create a co-contraction of two muscles C. It involves inhibitory interneurons. B. It involves excitatory interneurons. A. It does not involve interneurons. What is true about the flexor withdrawal reflex?
Answer the following essay questions: Your doctor taps on your patellar tendon. List out the steps, in detail, of the nervous pathway of the reflex he is testing. Include any sensory organs involved and the action of the reflex. Your Answer: The sensory neuron detects the tap on the patellar tendon, then sends signal through the ganglion in the dorsal root to the spinal cord. Then the sensory neruon synapses in the gray matter of the spinal cord onto a motor neuron in the anterior horn. The motor neuron sends signal through the ventral root and synapses back on the patellar tendon.
