Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Bioscience > Quiz #3 > Flashcards

Quiz #3 Flashcards

1
Q

Which of the following is not a function of the nervous system in the CNS and PNS?

  1. Metabolism
  2. Regulation
  3. Integration
  4. Organization
A

Metabolism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Action potentials are usually generated in:

  1. Dendrites
  2. Cell body
  3. Axon hillock
  4. Axons
A

Axon hillock (landmark that one can use to distinguish axon from dendrite)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The site of neurotransmitter storage and release is:

  1. Dendrites
  2. Cell body
  3. Axon hillock
  4. Axon terminal
A

Axon terminal (includes synaptic end bulbs)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

ALL living cells are capable of generating action potentials.

  1. True
  2. False
A

False. All living cells display a resting membrane potential. However, only some cells have electrically excitable membranes meaning they are capable of generating action potentials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Schwann cells are supporting cells of the nervous system found only in the PNS

  1. True
  2. False
A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Axons with small diameters conduct impulses at a much faster rate than axons with a large diameter

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Olm’s law is:

A

V=IR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The membrane voltage for a typical REAL cell is usually:

  1. 55 mV
  2. 70 mV
  3. -70 mV
  4. -90 mV
A

-70 mV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The ______primarily regulate extracellular K+, creating the diffusion potential across the membrane

  1. Kidneys
  2. Heart
  3. Lungs
  4. Liver
A

Kidneys

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The threshold potential is usually how much more than the resting membrane potential?

  1. 5 mV
  2. 10 mV
  3. 15 mV
  4. 20 mV
A

15 mV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Closing of sodium channels and re-opening of potassium channels occurs during:

  1. Repolarization
  2. Depolarization
  3. Resting membrane potential
  4. Hypopolarization
A

Repolarization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which of the following supporting cells of the CNS are responsible for myelinization of the CNS?

  1. Microglial cells
  2. Oligodendrocytes
  3. Ependymal cells
  4. Astrocytes
A

Oligodendrocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which of the following supporting cells of the CNS acts as a blood brain barrier?

  1. Microglial cells
  2. Oligodendrocytes
  3. Ependymal cells
  4. Astrocytes
A

Astrocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Epithelial cells of the spinal cord that produce and regulate CSF (lines the neural tube cavity):

  1. Microglial cells
  2. Oligodendrocytes
  3. Ependymal cells
  4. Astrocytes
A

Ependymal cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The action potential travels in 2 directions in vivo

  1. True
  2. False
A

False. It travels in only one direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Excitatory post synaptic potential (EPSP) can stimulate:

  1. Depolarization
  2. Repolarization
  3. Hyperpolarization
  4. Hypopolarization
A

Hypopolarization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What happens when acetylcholine is left in the synaptic cleft:

  1. Broken down into inactive substances by enzymes
  2. Taken back up into the presynaptic neuron in a process called reuptake
  3. Diffuses away into the intercellular fluid until its concentration is too low to influence postsynaptic excitability
A

Broken down into inactive substances by enzymes (acetylcholine esterase)

18
Q

Which of the muscles contain intercolated disks?

  1. Cardiac
  2. Smooth
  3. Skeletal
A

Cardiac- they allow electrical conduction to pass from one cell to another

19
Q

Which of the following is the proper order for skeletal muscle development?

  1. Myoblasts - myotubes - myocytes
  2. Myoblasts- myocytes - myotubes
  3. myotubes - myocytes - myoblasts
  4. Myotubes - myoblasts - myocytes
A

Myoblasts - myotubes - myocytes

20
Q

Unicellular myoblasts persist in mature skeletal muscle as satellite cells

  1. True
  2. False
21
Q

Which muscle tissue is multinucleated?

  1. Cardiac
  2. Smooth
  3. Skeletal
A

Skeletal b/c there are no distinct boundaries (syncytial)

22
Q

The structure from one Z-line running to the next is known as a:

  1. Sarcolemma
  2. Sarcomere
  3. Actin filaments
  4. Myosin filaments
A

Sarcomere. Z lines are held together by actin filaments

23
Q

The central portion of the sarcomere contains the dark band (A band) consisting mainly of:

  1. Actin microfilaments
  2. Myosin microfilaments
A

Myosin microfilaments (with some overlap of actin filaments)

24
Q

How many sarcomeres does it take to form an I band?

  1. 1
  2. 2
  3. 3
  4. 4
A

2…the I band is joined by two ends of a sarcomere which consists of actin filaments

25
Skeletal muscle contains a lot of ______ ER 1. Rough 2. Smooth
Smooth - sarcoplasmic reticulum
26
Muscle contraction involves: 1. sliding of the actin filaments inward among the myosin 2. sliding of the myosin filaments inward among the actin
sliding of the actin filaments inward among the myosin
27
Perimysium surrounds which of the following structures: 1. Muscle (organ) 2. Muscle Fasicle 3. Muscle fiber 4. Myofibril or fibril
Muscle fasicle
28
Which element is the sarcomere contained within? 1. Fasicle 2. Muscle fiber 3. Myofibril 4. Microfilament
Myofibril
29
Which of the following is the actual muscle cell? 1. Fasicle 2. Muscle fiber 3. Myofibril 4. Microfilament
Muscle fiber
30
thick filaments of the myofilaments mainly consist of: 1. bundled myosin heads 2. bundled actin heads
bundled myosin heads
31
which large protein appears to be responsible for most of the passive tension generated when the muscle is stretched beyond optimal length?
Titin molecule in the I band region
32
cross bridges are relative to: 1. thick filament 2. thin filament
thick filament
33
What is the name of the binding site on actin which allows for the attachment of myosin heads
tropomyosin
34
sarcoplasmic reticulum constantly requires ATP to move calcium out 1. True 2. False
true
35
T-tubules are extensions of: 1. Sarcoplasmic reticulum 2. Sarcolemma 3. Sarcomere
Sarcolemma
36
Muscle contraction ends with: 1. tropomyosin blockage being restored 2. reuptake of Ca2+ by SR 3. ATP hydrolysis
tropomyosin blockage being restored
37
During muscle contraction, all of the following happen except: 1. Sarcomeres shorten b/c actin filaments are pulled towards the m-line 2. I band gets shorter (sliding-filament theory) 3. none of the above 4. all of the above
all of the above
38
How do you grade the strength of a contraction?
motor unit recruitment and frequency modulation
39
The largest motor units get recruited first 1. True 2. False
False. smallest ones are recruited first
40
A single motor neuron will innervate multiple neurons 1. True 2. False
True
41
Cardiac muscle cannot be tetanized 1. True 2. False
True

Bioscience (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions