Physiology Test on 12/1/2012

Created by jessib3rry 

Upgrade to
remove ads

Which of the following statements about the resting membrane potential is TRUE?

it results in part from the concentration gradient of Na+ and K+

The resting membrane potential in a typical nerve cell is approximately?

-70mV

Compared to the outside surface, the inside of a resting cell membrane is?

negatively charged

As the charge on the membrane of a typical neuron approaches 0 grom -70mV, the cell is

depolarizing

The ion that plays a key role in initiating electrical signals in neuron is?

Na+

Which of the following is NOT involved in creating the resting potential of neuron?

Resting membrane permeability of sodium ions greater than potassium ion.

The nerst equation predicts

the membrane potential resulting from permeability to a single ion.

The total number of neurotransmitter released at the axon terminal is directly is to a single ion.

the total number of action potential

All of the following must occur before a second action potential can begin, except:

the Na+ and K+ ions that moved in/out of the cell most move back to their original compartments.

Which of the following does NOT influence the time necessary for a nerve impulse to be conveyed by a particular neuron?

whether axon is sensory or motor.

A chemical synapse ALWAYS includes ______.

Options:
1) Axon terminal
2) Presynaptic cell
3) Synaptic Cell
4) Postsynaptic Cell
5) Dendrite Cell

1, 2, 3, 4

Inhibitory neurotransmitters of the CNS act by opening ______ channels.

Cl- & K+

Which of the following neurophysiology concepts are not match up correctly?

Falling phase of the action potential - Na+ enters the cell.

Which of the following is NOt a known drug effect on synaptic function?

Change the type of neurotransmitter found in the synaptic vesicle.

The patterns of synaptic connectivity where a large number of presynaptic neurons

convergence.

When two or more graded potentials activate at the trigger zone, which of the following could happen
a. an excatory and inhibitory signal can cancel each other out.
b. two exctatory stimuli may be additive.
e. A B and C

e. A B and C

Which of the following statements in this group are true statements about IPSP and EPSP?

3, 6, 10

Temporal summation regers to ____.

additional graded potential(S) arriving before ones have ceased.

When multiple, possibly even conflicting signals reach a neuron, the neuron elevates the signals and may respond or not. The property is called?

postsynaptic intergration

The following are the main steps in the generation of an action potential. Choose the proper sequence of events.
a. the extracellular concentration of potassium will increase.
b. the intracellular concentration of sodium ion will increase.
c. the membrane resting potential will become more positive than normal.
d. all of the above-

d. all of the above

The following are the main steps in the generation of an action potential. Choose the proper sequence of events.
1. voltage gated sodium channels are inactivated
2. voltage regulated potassium, channels open and potassium moves out of the cell, initiating repolatization
3. Sodium channels regain their normal properties
4. A graded depolarization brings an area is of excitable ofan excitable membrane to
7. sodium....

4, 6, 7, 1, 2, 5, 3

The Following are steps involved in transmission at the cholinergic synapse. Choose the correct sequence of events.

3, 2, 4, 5, 1

Identify the false statement

skeletal muscle contraction is always under conscious control.

The purpose of transverse tubules is to

rapidly conduct action potential to the interior...

When a muscle cell contracts ______.

some myosin heads form cross bridges as others release actin

As ATP binds to myosin head at the beginning of a muscle contraction cycle

the myosin head detaches from actin

The power stroke begins when ____.

the inorganic phosphate and ADP are released from the myosin

As the conclusion of the power stroke

all of the above

The contraction cycle is triggered by the rise in ______ released from the sacroplasmic reticulum

Ca++

Put these events in the correct chronological sequence:
1. end plate potential trigger action potentials
2. transverse tubules convey potentials into the interior of the cell
3. acetycholine binds to receptors on the motor end plate.
4. binding sites on asctin are uncovered, allowing myosin to bind and carry out power strokes.
5. Ca++ is released from the sacroplasmic reticulumn.

3, 6, 1, 2, 5, 7, 4

A 10 year old girl with type 1 diabetes develops a neuropathy limited to sensory neuron with free nerve endings. Quantitative sensory testing will reveal higher than normal thrsholds for that detection of which of the following?

temperature

The resting membrane potential?

maintains when k+ leaks out into the extracellular and is pulled back in by a more inner negative charge.

Which are of the brain exerts(s) control over the autonomic nervous system?
1)cerebrum
2) cerebellum
3) hypothalamus
4) pons
5) medulla
6) thalmus

1, 3, 4, 5

Each of these statements is true except for one. Identify exception.

activation of a receptor open Na+ channels to the membrane

Increased parasympathetic stimulation

increases gastric mobility

all of the following autonomic nervous system are true

parasympathetic involve cranial nerve (3, 7, 6, 9, 10 only)

Which statement about cardiac muscle is false?

it uses ca2+ and calmodbulin

Striated muscles are so called because of tepeating pattern oflight and dark bands. One repeating unit of the banding ppattern is called a ______.

sacromere

the I band contains ______.

thin filament

which statement is true about skeletal muscle?
a. as the sacromere shortens, the two disks at each end move closer together and the I band and H band normally disappear
c. A and B

c. A and B

As the beginning of the muscle contraction cycle, the myosin head _____.

the myosin head detach from the actin.

Regulation of cross-bridge formation is accomplished by:
a. tropomyosin
b.troponin
c. calciu ion
a nd B
e. A B and C

A B and C

Metabolism of ____ is fastest way for cells to increase their supply of ATP in order to meet the ATP demands of heavy exercise
a. protien
b. glucose
c. fattty acids
d. A and B
e. A B and C.

A B and C

Choose the following physiological event at which the Na+ is incorrectly matched.

inactivation gate - open during re polarization gate

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set