Bio 253 Exam 2 Questions with Verified
Correct Answers
What does a central nervous system consists of
Brain and spinal cord
What is the function of the CNS
Integrated control center
What does a pns consist of
Cranial and spinal nerves
What is the function of the pns
Communication lines between CNS and the rest of the body
What sends impulses to The pns
Sensory division (afferent)
What sends impulses from CNS to effector (muscles or glands)
...efferent
Autonomic nervous system
Involuntary (viseral motor)
Conducts impulses from CNS to cardiac muscles smooth muscles and glands
Somatic nervous system
, Voluntary
Conducts impulses from CNS to skeletal muscle
Local potential (receptor potential) what does it do
Stimulates gated sodium ion channel
What do you need to do for stimulated gates to open
Cell needs to reach threshold
Can you simulate neuron during absolute refractory period or hyperpolarization
No
Can you simulate neuron during relative refractory time
Yes but you need a powerful stimulus
Refractory period
During depolarization sodium ions go inside
During repolarization potassium leaves
Hyperpolarization needs to be fixed by an exchange and ions so it can rest
What is a cell like at rest
Sodium on the outside and potassium inside
Layers of the external ear
Correct Answers
What does a central nervous system consists of
Brain and spinal cord
What is the function of the CNS
Integrated control center
What does a pns consist of
Cranial and spinal nerves
What is the function of the pns
Communication lines between CNS and the rest of the body
What sends impulses to The pns
Sensory division (afferent)
What sends impulses from CNS to effector (muscles or glands)
...efferent
Autonomic nervous system
Involuntary (viseral motor)
Conducts impulses from CNS to cardiac muscles smooth muscles and glands
Somatic nervous system
, Voluntary
Conducts impulses from CNS to skeletal muscle
Local potential (receptor potential) what does it do
Stimulates gated sodium ion channel
What do you need to do for stimulated gates to open
Cell needs to reach threshold
Can you simulate neuron during absolute refractory period or hyperpolarization
No
Can you simulate neuron during relative refractory time
Yes but you need a powerful stimulus
Refractory period
During depolarization sodium ions go inside
During repolarization potassium leaves
Hyperpolarization needs to be fixed by an exchange and ions so it can rest
What is a cell like at rest
Sodium on the outside and potassium inside
Layers of the external ear
