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Lecture 5

BIOL 1201 Lecture Notes - Lecture 5: Myelin, Signal Transduction, Axon Hillock


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Bill Wischusen
Lecture
5

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Practice Test 13
Which of the following is true of a target cell?
It must have a receptor for the chemical signal
A compound that is secreted in one part of the body and travels through the bloodstream to another
part of the body where it has an effect is called a(n)
Hormone
Protein signal molecules are not permeable to the cell membrane but can affect their target cells
because
the target cells have cell membrane bound receptors specific to the signal molecule
In a normal cell which of the following statements is correct
The membrane potential is negative
In a portal system how many capillary beds does the blood flow through as it travels from the heart
back to the heart?
2
Practice Test 14
Using the model of cell signaling regulation shown below an increase in compound 3 would stimulate
cells ________ to release more compound _________.
C,2
Using the model of cell signaling regulation shown below, will cells C produce more compound 3 if
cells A release more compound 1, (Yes or No)
Yes
Using this same model will cells A release more compound 1 if the levels of compound 3 increase, (Yes
or No)
No
In a normal cell which of the following statements is correct
The membrane potential is negative
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A membrane depolarization is generally caused by:
Na+ flowing into the cell
Excitable cells differ from other cells in that they have ____ in their membranes
Voltage-gated Na+ and K+ channels
Based on the figure location 4 is the result of _______ gates being open
Voltage gated K+ ion channel
While membrane depolarizations can be variable, all action potentials are the same.
True
Action potentials in myelinated axons propagate:
using salutatory motion
Voltage gated Na+ channels have ____ gates.
2
The portion of a neuron that transmits membrane potentials to the cell body is usually the:
Dendrites
Based on the figure the neurons at location "C" are:
Motor Neurons
A single neuron can synapse with ____ other neurons
Many
Post-synaptic cells respond to neurotransmitters through the neurotransmitter:
Binding to a receptor
The movement of _ and results in _ causes an EPSP.
Na+, depolarization
Practice Test 15
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In the post-synaptic neuron with a resting potential of -70mV and a threshold of -50mV. Two EPSPs
decrease the membrane potential by 15mV each and one IPSP increases the membrane potential by
with a 15mV.
Does this post-synaptic cell fire an action potential?
No
Based on the figure below is the statement below true or false? The
horizontal cells are involved in the integration of sensory information.
True
Based on the figure above is the statement below true or false? The rods
and cone are involved in sensory transduction
True
Based on the figure above is the following statement true or false? The
amacrine cells are responsible for amplifying the stimulus energy
False
During sensory adaptation your response to a stimulus
Decreases
The Central nervous System (CNS) consists of:
The brain and spinal cord
The somatic division
Is under conscious control
If muscles can only shorten when stimulated how is it possible for you to
move your limbs in at least two directions (flexed and extended):
By using pairs of muscles working in opposition to one another (antagonistic pairs)
The binding of actin to myosin during muscle contraction is regulated by
Ca++
Based on the figure below is the following statement true or false? The "A Band represents the length
of the thin filaments
False
Based on the figure above is the following statement true or false? During a muscle contraction the
space between the Z-lines will decrease.
True
Quiz Questions
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