APK 6205 Midterm UPDATED ACTUAL Questions and CORRECT Answers
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APK 6205
APK 6205 Midterm UPDATED ACTUAL
Questions and CORRECT Answers
What is the largest portion of the brain? - CORRECT ANSWER- The cerebrum
What are the motor areas of the brain? - CORRECT ANSWER- primary motor cortex;
premotor cortex; Broca's area; frontal eye field
Which structures consist of t...
APK 6205 Midterm UPDATED ACTUAL
Questions and CORRECT Answers
What is the largest portion of the brain? - CORRECT ANSWER✔✔- The cerebrum
What are the motor areas of the brain? - CORRECT ANSWER✔✔- primary motor cortex;
premotor cortex; Broca's area; frontal eye field
Which structures consist of the primary motor cortex? - CORRECT ANSWER✔✔-
Precentral gyrus (very back of the frontal lobe immediately before the central gyrus),
Brodmann area 4
What is the function of the primary motor cortex? - CORRECT ANSWER✔✔- Controlling
movements on opposite sides of the body
How does the primary motor cortex control movements on opposite sides of the body? -
CORRECT ANSWER✔✔- Large pyramidal cells project to contralateral motor neurons
What is the map that shows somatotopic organization? - CORRECT ANSWER✔✔- Motor
homunculus
What are the functions of the premotor cortex? - CORRECT ANSWER✔✔- Receive highly
processed sensory info, planning movements
Where is the premotor cortex located? - CORRECT ANSWER✔✔- Anterior to the primary
motor cortex
Where is the frontal eye field located? - CORRECT ANSWER✔✔- Anterior to the premotor
cortex
What is the function of the frontal eye field? - CORRECT ANSWER✔✔- Controlling
voluntary eye movements
,Where is Broca's area located? - CORRECT ANSWER✔✔- Anterior to the inferior premotor
cortex
What is the function of Broca's area? - CORRECT ANSWER✔✔- Manages speech
production (motor speech)
On which portion of the motor homunculus is Broca's area located? - CORRECT
ANSWER✔✔- Next to the mouth and hands
What does RMP stand for? - CORRECT ANSWER✔✔- resting membrane potential
What is RMP? - CORRECT ANSWER✔✔- The potential difference that exists across a cell
membrane in the absence of a stimulus
What causes the potential difference in RMP - CORRECT ANSWER✔✔- the separation of
charged particles by the capacitance of the membrane (liquid bilayer)
What is the value of RMP - CORRECT ANSWER✔✔- -70 mV
What is the extracellular portion of a cell at RMP? - CORRECT ANSWER✔✔- Sodium and
chloride ions
What is the inside of a cell (intracellular portion) at RMP? - CORRECT ANSWER✔✔-
Potassium ions
How can you remember the difference between the extracellular and intracellular ions at
RMP in a cell? - CORRECT ANSWER✔✔- "Salty banana"
Why do cells have an RMP? - CORRECT ANSWER✔✔- For communication (transport of
information), and to depolarize / hyperpolarize a cell
Changing the RMP also changes what? - CORRECT ANSWER✔✔- Modulates the chances
of a neuron to fire
, How often is RMP disrupted? - CORRECT ANSWER✔✔- Constantly
How is RMP disrupted? - CORRECT ANSWER✔✔- By ionic flow across the membrane
What are the two types of ionic flow across the membrane? - CORRECT ANSWER✔✔-
Passive and gated diffusion
What is passive diffusion? - CORRECT ANSWER✔✔- Ions flow from high to low
concentration via resting channels that are constantly open
What is in influx with passive diffusion? - CORRECT ANSWER✔✔- Na+
What is in efflux with passive diffusion? - CORRECT ANSWER✔✔- K+
What are the two types of gated diffusion? - CORRECT ANSWER✔✔- Ligand and voltage
What is ligand gated diffusion? - CORRECT ANSWER✔✔- Gates open when a chemical
ligand binds to a receptor site to allow ion flow
What is voltage gated diffusion? - CORRECT ANSWER✔✔- Open when a voltage changes
to allow ion flow
Is depolarization phase excitatory or inhibitory? - CORRECT ANSWER✔✔- Excitatory
What happens when a cell is depolarized? - CORRECT ANSWER✔✔- Charge becomes less
negative (more positive)
What leaves the cell during depolarization? What enters? - CORRECT ANSWER✔✔- Na+
enters, K+ leaves
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