UTK BCMB 230: exam 2 Questions and
Answers 100% Pass
sensory input - ✔✔we take in information about the world around us
Integrative functions - ✔✔Our body has to recognize what the sensory input means
Motor output - ✔✔The physical response to the sensory input
Central Nervous System (CNS) - ✔✔Brain and spinal cord
Peripheral Nervous System (PNS) - ✔✔Nerves that branch off to the spinal cord and
sensory receptors. PNS connects to the CNS.
autonomic nervous system - ✔✔Sympathetic nervous system: fight or flight
Parasympathetic nervous system: organ function
Somatic nervous system - ✔✔Sensory: taking in information from out environment
Motor: telling cells what to do
Neurons - ✔✔a nerve cell; the basic building block of the nervous system
Glial cells - ✔✔These are supportive cells that help nourish and protect neurons
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, Types of neurons - ✔✔Afferent: brings sensory input from the body to the CNS
Interneurons: decipher sensory info and "plan" a response
Efferent: bring the motor output from the CNS to the body
How neurons send messages - ✔✔1. Receives signal from neurotransmitter
2. responds to the signal by changing potential
3. travels down the neuron like a wave
4. axon terminals receive and release neurotransmitter for next neuron
5. cycle repeats
Schwann cells - ✔✔produce myelin in PNS
myelin sheath - ✔✔covers the axon of some neurons and helps speed neural impulses
resting membrane potential - ✔✔between -40 and -90 mV
Action potentials - ✔✔A brief all-or-none depolarization of the membrane, which
reverses polarity in neurons
Action potential steps - ✔✔1. Na channels open and begin to depolarize (Na enters)
2. Sodium channels close and K+ channels open to repolarize (K leaves)
3. Hyperpolarization begins (membrane potential decreases too quickly)
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Answers 100% Pass
sensory input - ✔✔we take in information about the world around us
Integrative functions - ✔✔Our body has to recognize what the sensory input means
Motor output - ✔✔The physical response to the sensory input
Central Nervous System (CNS) - ✔✔Brain and spinal cord
Peripheral Nervous System (PNS) - ✔✔Nerves that branch off to the spinal cord and
sensory receptors. PNS connects to the CNS.
autonomic nervous system - ✔✔Sympathetic nervous system: fight or flight
Parasympathetic nervous system: organ function
Somatic nervous system - ✔✔Sensory: taking in information from out environment
Motor: telling cells what to do
Neurons - ✔✔a nerve cell; the basic building block of the nervous system
Glial cells - ✔✔These are supportive cells that help nourish and protect neurons
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, Types of neurons - ✔✔Afferent: brings sensory input from the body to the CNS
Interneurons: decipher sensory info and "plan" a response
Efferent: bring the motor output from the CNS to the body
How neurons send messages - ✔✔1. Receives signal from neurotransmitter
2. responds to the signal by changing potential
3. travels down the neuron like a wave
4. axon terminals receive and release neurotransmitter for next neuron
5. cycle repeats
Schwann cells - ✔✔produce myelin in PNS
myelin sheath - ✔✔covers the axon of some neurons and helps speed neural impulses
resting membrane potential - ✔✔between -40 and -90 mV
Action potentials - ✔✔A brief all-or-none depolarization of the membrane, which
reverses polarity in neurons
Action potential steps - ✔✔1. Na channels open and begin to depolarize (Na enters)
2. Sodium channels close and K+ channels open to repolarize (K leaves)
3. Hyperpolarization begins (membrane potential decreases too quickly)
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