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BMSC207- Module 3 Test with Questions and 100% Correct Answers
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BMSC207- Module 3 Test with Questionsand 100% Correct Answers
what is repolarizing? - Answer - the return to the resting membrane potential
- starting at -70 going to +10 then returning to -70
what is the ions current? - Answer the flow of electrical charge carried by an ion
what is Ohm's law? - Answer - current flow (I) is directly proportional to the electical
potential difference (in volts, V) between two points and inversely proportional to
the resistance (R)
- I=V/R
what are the two sources of resistance in a cell? - Answer - membrane resistance (Rm)
(the resistance of phospholipid bilayer)
- internal resistance of cytoplasm (Ri) (cytoplasmic composition and size of the cell)
what will resistance determine? - Answer - how far current will flow in a cell before
the energy is dissipated
- if resistance is high the ions will flow further
what is graded potentials? - Answer - variable strength signals that travel over
short distances and lose strength as they travel.
- can be depolarizing or hyperpolarizing
- if graded potentials create a large enough depolarization it can induce an
action potential
, - dependent on an input signal
what is the nervous system? - Answer coordinated voluntary and involuntary actions
and transmits signals to and from different parts of its body
what is afferent (sensory)? - Answer - carry information about temperature, pressure,
light and other stimuli to the CNS
- specialized receptor converts stimulus to electrical energy
what is efferent (motor and autonomic)? - Answer - motor: control skeletal muscles
- autonomic: influences many internal organs (sympathetic and parasympathetic)
- usually have axon terminals or varicosities
- carry information away from CNS
what is apart of the central nervous system? - Answer -
brain - spinal cord
What is apart of the peripheral nervous system? - Answer - nerve tissue outside the CNS
- cranial nerves and branches
- spinal nerves and branches
- ganglia
- plexuses
- sensory receptors
what is in the afferent division? - Answer - somatic sensory
- visceral sensory
- special sensory
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