Which of the following shows the steps of the sliding filament theory in the correct order?

crossbridge formation, powerstroke, crossbridge detachment, ATP hydrolysis

What is true about Henneman’s size principle?

Small motor units are activated first

What is excitability?

ability to respond to a stimulus

What's true about wave summation?

increases force of contraction by increasing frequency of nerve impulses

What is true about actin and myosin?

They generate force needed for contraction by sliding past each other

What is true about the bicep in this picture?

Agonist, Concentric contraction

What's true about tetanus?

contraction is sustained & no relaxation period

Why do muscles contain different sized motor units?

So they can perform different functions

What is the job of calcium in muscle movement?

Calcium causes active sites on actin to be exposed so myosin can bind

What is extensibility?

ability to be stretched/extended

What is number 1 and number 2?

1 = Muscle Fiber, 2 = Endomysium

How does the nervous system control the amount of tension that a muscle generates?

Changes action potential frequency sent by motor neurons to muscle fibers

What are the three phases of a muscle twitch?

latent, contraction, relaxation

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Muscle System Review

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Questions 26

Answers

1
Which of the following shows the steps of the sliding filament theory in the correct order?
crossbridge detachment, ATP hydrolysis, powerstroke, crossbridge formation
ATP hydrolysis, powerstroke, crossbridge formation, crossbridge detachment
crossbridge formation, powerstroke, crossbridge detachment, ATP hydrolysis
powerstroke, crossbridge detachment, crossbridge formation, ATP hydrolysis
2
What is true about Henneman’s size principle?
Small motor units are activated first
more effort needs less motor units
Large motor units are activated first
less effort needs more motor units
3
What is excitability?
ability of a muscle to return to its original length when relaxed
ability to be stretched/extended
ability to respond to a stimulus
ability to forcefully shorten
4
Which of these are ALWAYS involuntary?
Skeletal and smooth muscle
They are all always involuntary
Cardiac and skeletal muscle
Smooth and cardiac muscle
5
What's true about wave summation?
increases force of contraction by increasing frequency of nerve impulses
decreases latent period by increasing oxygen and calcium
increases nerve impulses to have no relaxation period
decreases force by increasing frequency of nerve impulses
6
Muscles always push
True
False, they pull
7
changing number of motor neurons sending action potentials is how nervous system controls amount of tension muscle makes
True
False
8
Skeletal muscle is always involuntary
True
False
9
What is number 3 and number 4?
3 = Perimysium, 4 = Muscle Fiber
3 = Perimysium, 4 = Epimysium
3= Endomysium, 4 = Epimysium
3 = Muscle Fiber, 4 = Endomysium
10
Long, cylindrical cells that are striated and multinucleated is a description for what type of muscle?
Skeletal muscle
Smooth muscle
Cardiac muscle
Nerve muscle
11
Having more than one motor unit allows for fine motor control and large, powerful movements. What principle is this?
Mendel's symbotic inheritance
Henneman’s size principle
Sliding filament model
Eccentric muscle theory
12
What is true about actin and myosin?
They are lipids that help with muscle relaxation
They transport nutrients and oxygen to muscle cells.
They generate force needed for contraction by sliding past each other
They make energy in muscle cells to fuel muscle contraction
13
What does this picture represent?
Henneman’s size principle
Sliding filament model
Tetanus
Wave summation
14
What is true about the bicep in this picture?
Agonist, Concentric contraction
Antagonist, Eccentric contraction
All of these are correct
Agonist, Isometric contraction
15
What's true about tetanus?
all of these are true
has no contraction period
higher frequency of nerve impulses, has a relaxation period
contraction is sustained & no relaxation period
16
Why do muscles contain different sized motor units?
So they can split up into sarcomeres to hydrolyze CO2
They're all the same
So they can attach to different cardiac muscle
So they can perform different functions
17
What is the job of calcium in muscle movement?
Calcium causes active sites on actin to be exposed so myosin can bind
Calcium helps generate ATP needed for muscle contraction.
Calcium is needed for muscle relaxation early on
Calcium is needed for eccentric relaxation
18
What is extensibility?
ability of a muscle to return to its original length when relaxed
ability to forcefully shorten
ability to be stretched/extended
ability to respond to a stimulus
19
To stop muscle contractions the sarcolemma is depolarized
True
False
20
What is number 1 and number 2?
1= Muscle Fiber, 2 = Epimysium
1 = Muscle Fiber, 2 = Endomysium
1 = Perimysium, 2 = Epimysium
1 = Perimysium, 2= Endomysium
21
Sarcomeres store and release calcium ions during and after muscle contraction
True
False
22
How does the nervous system control the amount of tension that a muscle generates?
By changing how strong each action potential is.
Changes action potential frequency sent by motor neurons to muscle fibers
Causing fast twitch to happen continuously in the sarcoplasm
Attaching myosin fibrils to new motor units to produce calcium
23
What are the three phases of a muscle twitch?
latent, tetanus, relaxation
latent, contraction, relaxation
contraction, relaxation, tetanus
relaxation, contraction, exotraction
24
A group of muscle fibers innervated by a single motor neuron describes what?
smooth muscle
motor unit
sarcomere
twitch
25
The muscle gets longer while still generating force is a characteristic of what contraction?
Concentric
Ecocentric
Isometric
Eccentric
26
Which is NOT an antagonistic pair?
quads and hamstrings
biceps and triceps
glutes and hip flexors
abdominals and hamstrings

Muscle System Review Flashcards | StudBud